-
/**************************************************************************
* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
* *
#include <TTree.h>
#include <TClonesArray.h>
#include <TTreeStream.h>
+#include <TGeoMatrix.h>
+#include <TGeoManager.h>
#include "AliLog.h"
+#include "AliMathBase.h"
#include "AliESDEvent.h"
#include "AliGeomManager.h"
#include "AliRieman.h"
const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
- 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
- 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
- 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
-};
+ 0.5112, 0.5112, 0.5112, 0.0786, 0.0786,
+ 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
+ 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
+};
+const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = {
+ 300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
Int_t AliTRDtrackerV1::fgNTimeBins = 0;
-TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0;
AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
//____________________________________________________________________
-AliTRDtrackerV1::AliTRDtrackerV1()
- :AliTracker()
- ,fGeom(new AliTRDgeometry())
- ,fClusters(0x0)
- ,fTracklets(0x0)
- ,fTracks(0x0)
- ,fSieveSeeding(0)
+AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
+ :AliTracker()
+ ,fReconstructor(0x0)
+ ,fGeom(0x0)
+ ,fClusters(0x0)
+ ,fTracklets(0x0)
+ ,fTracks(0x0)
+ ,fSieveSeeding(0)
{
- //
- // Default constructor.
- //
- if (!AliTRDcalibDB::Instance()) {
- AliFatal("Could not get calibration object");
- }
- fgNTimeBins = AliTRDcalibDB::Instance()->GetNumberOfTimeBins();
-
- for (Int_t isector = 0; isector < AliTRDgeometry::kNsect; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
-
- if(AliTRDReconstructor::StreamLevel() > 1){
- TDirectory *savedir = gDirectory;
- fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
- savedir->cd();
- }
+ //
+ // Default constructor.
+ //
+
+ SetReconstructor(rec); // initialize reconstructor
+
+ // initialize geometry
+ if(!AliGeomManager::GetGeometry()){
+ AliFatal("Could not get geometry.");
+ }
+ fGeom = new AliTRDgeometry();
+ fGeom->CreateClusterMatrixArray();
+ TGeoHMatrix *matrix = 0x0;
+ Double_t loc[] = {0., 0., 0.};
+ Double_t glb[] = {0., 0., 0.};
+ for(Int_t ily=kNPlanes; ily--;){
+ Int_t ism = 0;
+ while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++;
+ if(!matrix){
+ AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily));
+ fR[ily] = fgkX0[ily];
+ continue;
+ }
+ matrix->LocalToMaster(loc, glb);
+ fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick();
+ }
+
+ // initialize calibration values
+ AliTRDcalibDB *trd = 0x0;
+ if (!(trd = AliTRDcalibDB::Instance())) {
+ AliFatal("Could not get calibration.");
+ }
+ if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
+
+ // initialize cluster containers
+ for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
+
+ // initialize arrays
+ memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t));
+ memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t));
+ memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*));
}
//____________________________________________________________________
AliTRDtrackerV1::~AliTRDtrackerV1()
{
- //
- // Destructor
- //
-
- if(fgDebugStreamer) delete fgDebugStreamer;
- if(fgRieman) delete fgRieman;
- if(fgTiltedRieman) delete fgTiltedRieman;
- if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained;
- if(fTracks) {fTracks->Delete(); delete fTracks;}
- if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
- if(fClusters) {fClusters->Delete(); delete fClusters;}
- if(fGeom) delete fGeom;
+ //
+ // Destructor
+ //
+
+ if(fgRieman) delete fgRieman; fgRieman = 0x0;
+ if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0;
+ if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0;
+ for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
+ if(fTracks) {fTracks->Delete(); delete fTracks;}
+ if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
+ if(fClusters) {
+ fClusters->Delete(); delete fClusters;
+ }
+ if(fGeom) delete fGeom;
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
{
- //
- // Steering stand alone tracking for full TRD detector
- //
- // Parameters :
- // esd : The ESD event. On output it contains
- // the ESD tracks found in TRD.
- //
- // Output :
- // Number of tracks found in the TRD detector.
- //
- // Detailed description
- // 1. Launch individual SM trackers.
- // See AliTRDtrackerV1::Clusters2TracksSM() for details.
- //
-
- if(!AliTRDReconstructor::RecoParam()){
- AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
- return 0;
- }
-
- //AliInfo("Start Track Finder ...");
- Int_t ntracks = 0;
- for(int ism=0; ism<AliTRDgeometry::kNsect; ism++){
- // for(int ism=1; ism<2; ism++){
- //AliInfo(Form("Processing supermodule %i ...", ism));
- ntracks += Clusters2TracksSM(ism, esd);
- }
- AliInfo(Form("Number of found tracks : %d", ntracks));
- return ntracks;
+ //
+ // Steering stand alone tracking for full TRD detector
+ //
+ // Parameters :
+ // esd : The ESD event. On output it contains
+ // the ESD tracks found in TRD.
+ //
+ // Output :
+ // Number of tracks found in the TRD detector.
+ //
+ // Detailed description
+ // 1. Launch individual SM trackers.
+ // See AliTRDtrackerV1::Clusters2TracksSM() for details.
+ //
+
+ if(!fReconstructor->GetRecoParam() ){
+ AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
+ return 0;
+ }
+
+ //AliInfo("Start Track Finder ...");
+ Int_t ntracks = 0;
+ for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
+ // for(int ism=1; ism<2; ism++){
+ //AliInfo(Form("Processing supermodule %i ...", ism));
+ ntracks += Clusters2TracksSM(ism, esd);
+ }
+ AliInfo(Form("Number of found tracks : %d", ntracks));
+ return ntracks;
}
//_____________________________________________________________________________
Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
{
- //AliInfo(Form("Asking for tracklet %d", index));
-
- if(index<0) return kFALSE;
- AliTRDseedV1 *tracklet = 0x0;
- if(!(tracklet = (AliTRDseedV1*)fTracklets->UncheckedAt(index))) return kFALSE;
-
- // get detector for this tracklet
- AliTRDcluster *cl = 0x0;
- Int_t ic = 0; do; while(!(cl = tracklet->GetClusters(ic++)));
- Int_t idet = cl->GetDetector();
-
- Double_t local[3];
- local[0] = tracklet->GetX0();
- local[1] = tracklet->GetYfit(0);
- local[2] = tracklet->GetZfit(0);
- Double_t global[3];
- fGeom->RotateBack(idet, local, global);
- p.SetXYZ(global[0],global[1],global[2]);
-
-
- // setting volume id
- AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
- switch (fGeom->GetPlane(idet)) {
- case 0:
- iLayer = AliGeomManager::kTRD1;
- break;
- case 1:
- iLayer = AliGeomManager::kTRD2;
- break;
- case 2:
- iLayer = AliGeomManager::kTRD3;
- break;
- case 3:
- iLayer = AliGeomManager::kTRD4;
- break;
- case 4:
- iLayer = AliGeomManager::kTRD5;
- break;
- case 5:
- iLayer = AliGeomManager::kTRD6;
- break;
- };
- Int_t modId = fGeom->GetSector(idet) * fGeom->Ncham() + fGeom->GetChamber(idet);
- UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
- p.SetVolumeID(volid);
-
- return kTRUE;
+ //AliInfo(Form("Asking for tracklet %d", index));
+
+ // reset position of the point before using it
+ p.SetXYZ(0., 0., 0.);
+ AliTRDseedV1 *tracklet = GetTracklet(index);
+ if (!tracklet) return kFALSE;
+
+ // get detector for this tracklet
+ Int_t det = tracklet->GetDetector();
+ Int_t sec = fGeom->GetSector(det);
+ Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(),
+ sinA = TMath::Sin(alpha),
+ cosA = TMath::Cos(alpha);
+ Double_t local[3];
+ local[0] = tracklet->GetX();
+ local[1] = tracklet->GetY();
+ local[2] = tracklet->GetZ();
+ Double_t global[3];
+ fGeom->RotateBack(det, local, global);
+
+ Double_t cov2D[3]; Float_t cov[6];
+ tracklet->GetCovAt(local[0], cov2D);
+ cov[0] = cov2D[0]*sinA*sinA;
+ cov[1] =-cov2D[0]*sinA*cosA;
+ cov[2] =-cov2D[1]*sinA;
+ cov[3] = cov2D[0]*cosA*cosA;
+ cov[4] = cov2D[1]*cosA;
+ cov[5] = cov2D[2];
+ // store the global position of the tracklet and its covariance matrix in the track point
+ p.SetXYZ(global[0],global[1],global[2], cov);
+
+ // setting volume id
+ AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det));
+ Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det);
+ UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
+ p.SetVolumeID(volid);
+
+ return kTRUE;
}
//____________________________________________________________________
TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
{
- if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
- return fgTiltedRieman;
+ if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
+ return fgTiltedRieman;
}
//____________________________________________________________________
TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
{
- if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
- return fgTiltedRiemanConstrained;
+ if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
+ return fgTiltedRiemanConstrained;
}
-
+
//____________________________________________________________________
AliRieman* AliTRDtrackerV1::GetRiemanFitter()
{
- if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNplan);
- return fgRieman;
+ if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
+ return fgRieman;
}
-
+
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
{
- //
- // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
- // backpropagated by the TPC tracker. Each seed is first propagated
- // to the TRD, and then its prolongation is searched in the TRD.
- // If sufficiently long continuation of the track is found in the TRD
- // the track is updated, otherwise it's stored as originaly defined
- // by the TPC tracker.
- //
-
- // Calibration monitor
- AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
- if (!calibra) AliInfo("Could not get Calibra instance\n");
-
- Int_t found = 0; // number of tracks found
- Float_t foundMin = 20.0;
-
- Int_t nSeed = event->GetNumberOfTracks();
- if(!nSeed){
- // run stand alone tracking
- if (AliTRDReconstructor::SeedingOn()) Clusters2Tracks(event);
- return 0;
- }
-
- Float_t *quality = new Float_t[nSeed];
- Int_t *index = new Int_t[nSeed];
- for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
- AliESDtrack *seed = event->GetTrack(iSeed);
- Double_t covariance[15];
- seed->GetExternalCovariance(covariance);
- quality[iSeed] = covariance[0] + covariance[2];
- }
- // Sort tracks according to covariance of local Y and Z
- TMath::Sort(nSeed,quality,index,kFALSE);
-
- // Backpropagate all seeds
- Int_t expectedClr;
- AliTRDtrackV1 track;
- for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
-
- // Get the seeds in sorted sequence
- AliESDtrack *seed = event->GetTrack(index[iSeed]);
-
- // Check the seed status
- ULong_t status = seed->GetStatus();
- if ((status & AliESDtrack::kTPCout) == 0) continue;
- if ((status & AliESDtrack::kTRDout) != 0) continue;
-
- // Do the back prolongation
- Int_t lbl = seed->GetLabel();
- new(&track) AliTRDtrackV1(*seed);
- //track->Print();
- track.SetSeedLabel(lbl);
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); // Make backup
- Float_t p4 = track.GetC();
- if((expectedClr = FollowBackProlongation(track))){
- // computes PID for track
- track.CookPID();
- // update calibration references using this track
- if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
- // save calibration object
- if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
-
- track.UpdateESDtrack(seed);
-
- // Add TRD track to ESDfriendTrack
- if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){
- AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
- calibTrack->SetOwner();
- seed->AddCalibObject(calibTrack);
- }
- }
- }
-
- if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
- //
- // Make backup for back propagation
- //
- Int_t foundClr = track.GetNumberOfClusters();
- if (foundClr >= foundMin) {
- //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
- track.CookdEdx();
- track.CookdEdxTimBin(seed->GetID());
- track.CookLabel(1. - fgkLabelFraction);
- if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
-
-
- // Sign only gold tracks
- if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
- if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
- }
- Bool_t isGold = kFALSE;
-
- // Full gold track
- if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
- if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
-
- isGold = kTRUE;
- }
-
- // Almost gold track
- if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
- //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
- if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
-
- isGold = kTRUE;
- }
-
- if ((!isGold) && (track.GetBackupTrack())) {
- if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
- seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
- isGold = kTRUE;
- }
- }
-
- //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
- //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
- //}
- }
- }
-
- // Propagation to the TOF (I.Belikov)
- if (track.GetStop() == kFALSE) {
- Double_t xtof = 371.0;
- Double_t xTOF0 = 370.0;
-
- Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
- if (TMath::Abs(c2) >= 0.99) continue;
-
- PropagateToX(track, xTOF0, fgkMaxStep);
-
- // Energy losses taken to the account - check one more time
- c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
- if (TMath::Abs(c2) >= 0.99) continue;
-
- //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
- // fHBackfit->Fill(7);
- //delete track;
- // continue;
- //}
-
- Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
- Double_t y;
- track.GetYAt(xtof,GetBz(),y);
- if (y > ymax) {
- if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
- }else if (y < -ymax) {
- if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
- }
-
- if (track.PropagateTo(xtof)) {
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
- track.UpdateESDtrack(seed);
-
- // Add TRD track to ESDfriendTrack
-// if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){
-// AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
-// calibTrack->SetOwner();
-// seed->AddCalibObject(calibTrack);
-// }
- found++;
- }
- } else {
- if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
-
- track.UpdateESDtrack(seed);
-
- // Add TRD track to ESDfriendTrack
-// if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){
-// AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
-// calibTrack->SetOwner();
-// seed->AddCalibObject(calibTrack);
-// }
- found++;
- }
- }
-
- seed->SetTRDQuality(track.StatusForTOF());
- seed->SetTRDBudget(track.GetBudget(0));
- }
-
-
- AliInfo(Form("Number of seeds: %d", nSeed));
- AliInfo(Form("Number of back propagated TRD tracks: %d", found));
-
- delete [] index;
- delete [] quality;
-
- return 0;
+// Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building
+// a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points,
+// covariance, PID, etc.) are than used to update the corresponding ESD track.
+// Each track seed is first propagated to the geometrical limit of the TRD detector.
+// Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are
+// constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated.
+// Otherwise the ESD track is left unchanged.
+//
+// The following steps are performed:
+// 1. Selection of tracks based on the variance in the y-z plane.
+// 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set.
+// 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking
+// the following status bits:
+// - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume
+// - AliESDtrack::kTRDStop - if the tracks fails propagation
+// - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting
+// 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout.
+// 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set.
+//
+
+ AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
+ if (!calibra) AliInfo("Could not get Calibra instance\n");
+
+ // Define scalers
+ Int_t nFound = 0, // number of tracks found
+ nSeeds = 0, // total number of ESD seeds
+ nTRDseeds= 0, // number of seeds in the TRD acceptance
+ nTPCseeds= 0; // number of TPC seeds
+ Float_t foundMin = 20.0;
+
+ Float_t *quality = 0x0;
+ Int_t *index = 0x0;
+ nSeeds = event->GetNumberOfTracks();
+ // Sort tracks according to quality
+ // (covariance in the yz plane)
+ if(nSeeds){
+ quality = new Float_t[nSeeds];
+ index = new Int_t[nSeeds];
+ for (Int_t iSeed = nSeeds; iSeed--;) {
+ AliESDtrack *seed = event->GetTrack(iSeed);
+ Double_t covariance[15];
+ seed->GetExternalCovariance(covariance);
+ quality[iSeed] = covariance[0] + covariance[2];
+ }
+ TMath::Sort(nSeeds, quality, index,kFALSE);
+ }
+
+ // Propagate all seeds
+ Int_t expectedClr;
+ AliTRDtrackV1 track;
+ for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) {
+
+ // Get the seeds in sorted sequence
+ AliESDtrack *seed = event->GetTrack(index[iSeed]);
+ Float_t p4 = seed->GetC(seed->GetBz());
+
+ // Check the seed status
+ ULong_t status = seed->GetStatus();
+ if ((status & AliESDtrack::kTPCout) == 0) continue;
+ if ((status & AliESDtrack::kTRDout) != 0) continue;
+
+ // Propagate to the entrance in the TRD mother volume
+ new(&track) AliTRDtrackV1(*seed);
+ if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
+ continue;
+ }
+ if(!AdjustSector(&track)){
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
+ continue;
+ }
+ if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) {
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
+ continue;
+ }
+
+ nTPCseeds++;
+
+ // store track status at TRD entrance
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
+
+ // prepare track and do propagation in the TRD
+ track.SetReconstructor(fReconstructor);
+ track.SetKink(Bool_t(seed->GetKinkIndex(0)));
+ expectedClr = FollowBackProlongation(track);
+ // check if track entered the TRD fiducial volume
+ if(track.GetTrackLow()){
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
+ nTRDseeds++;
+ }
+ // check if track was stopped in the TRD
+ if (expectedClr<0){
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
+ continue;
+ }
+
+ if(expectedClr){
+ nFound++;
+ // computes PID for track
+ track.CookPID();
+ // update calibration references using this track
+ if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
+ // save calibration object
+ if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
+ AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
+ calibTrack->SetOwner();
+ seed->AddCalibObject(calibTrack);
+ }
+ //update ESD track
+ if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
+ track.UpdateESDtrack(seed);
+ }
+ }
+
+ if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
+
+ // Make backup for back propagation
+ Int_t foundClr = track.GetNumberOfClusters();
+ if (foundClr >= foundMin) {
+ track.CookLabel(1. - fgkLabelFraction);
+ //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
+
+ // Sign only gold tracks
+ if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
+ //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track);
+ }
+ Bool_t isGold = kFALSE;
+
+ // Full gold track
+ if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
+ if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
+
+ isGold = kTRUE;
+ }
+
+ // Almost gold track
+ if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
+ //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
+ if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
+
+ isGold = kTRUE;
+ }
+
+ if ((!isGold) && (track.GetBackupTrack())) {
+ if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
+ seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
+ isGold = kTRUE;
+ }
+ }
+ }
+ }
+
+ // Propagation to the TOF
+ if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) {
+ Int_t sm = track.GetSector();
+ // default value in case we have problems with the geometry.
+ Double_t xtof = 371.;
+ //Calculate radial position of the beginning of the TOF
+ //mother volume. In order to avoid mixing of the TRD
+ //and TOF modules some hard values are needed. This are:
+ //1. The path to the TOF module.
+ //2. The width of the TOF (29.05 cm)
+ //(with the help of Annalisa de Caro Mar-17-2009)
+ if(gGeoManager){
+ gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm));
+ TGeoHMatrix *m = 0x0;
+ Double_t loc[]={0., 0., -.5*29.05}, glob[3];
+
+ if((m=gGeoManager->GetCurrentMatrix())){
+ m->LocalToMaster(loc, glob);
+ xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]);
+ }
+ }
+ if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
+ continue;
+ }
+ if(!AdjustSector(&track)){
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
+ continue;
+ }
+ if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
+ continue;
+ }
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
+ // TODO obsolete - delete
+ seed->SetTRDQuality(track.StatusForTOF());
+ }
+ seed->SetTRDBudget(track.GetBudget(0));
+ }
+ if(index) delete [] index;
+ if(quality) delete [] quality;
+
+ AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds));
+ AliInfo(Form("Number of tracks: TRDout[%d]", nFound));
+
+ // run stand alone tracking
+ if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
+
+ return 0;
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
{
- //
- // Refits tracks within the TRD. The ESD event is expected to contain seeds
- // at the outer part of the TRD.
- // The tracks are propagated to the innermost time bin
- // of the TRD and the ESD event is updated
- // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
- //
-
- Int_t nseed = 0; // contor for loaded seeds
- Int_t found = 0; // contor for updated TRD tracks
-
-
- AliTRDtrackV1 track;
- for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
- AliESDtrack *seed = event->GetTrack(itrack);
- new(&track) AliTRDtrackV1(*seed);
-
- if (track.GetX() < 270.0) {
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
- continue;
- }
-
- ULong_t status = seed->GetStatus();
- if((status & AliESDtrack::kTRDout) == 0) continue;
- if((status & AliESDtrack::kTRDin) != 0) continue;
- nseed++;
-
- track.ResetCovariance(50.0);
-
- // do the propagation and processing
- Bool_t kUPDATE = kFALSE;
- Double_t xTPC = 250.0;
- if(FollowProlongation(track)){
- // Prolongate to TPC
- if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
- found++;
- kUPDATE = kTRUE;
- }
- }
-
- // Prolongate to TPC without update
- if(!kUPDATE) {
- AliTRDtrackV1 tt(*seed);
- if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
- }
- }
- AliInfo(Form("Number of loaded seeds: %d",nseed));
- AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
-
- return 0;
+ //
+ // Refits tracks within the TRD. The ESD event is expected to contain seeds
+ // at the outer part of the TRD.
+ // The tracks are propagated to the innermost time bin
+ // of the TRD and the ESD event is updated
+ // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
+ //
+
+ Int_t nseed = 0; // contor for loaded seeds
+ Int_t found = 0; // contor for updated TRD tracks
+
+
+ AliTRDtrackV1 track;
+ for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
+ AliESDtrack *seed = event->GetTrack(itrack);
+ new(&track) AliTRDtrackV1(*seed);
+
+ if (track.GetX() < 270.0) {
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
+ continue;
+ }
+
+ // reject tracks which failed propagation in the TRD or
+ // are produced by the TRD stand alone tracker
+ ULong_t status = seed->GetStatus();
+ if(!(status & AliESDtrack::kTRDout)) continue;
+ if(!(status & AliESDtrack::kTRDin)) continue;
+ nseed++;
+
+ track.ResetCovariance(50.0);
+
+ // do the propagation and processing
+ Bool_t kUPDATE = kFALSE;
+ Double_t xTPC = 250.0;
+ if(FollowProlongation(track)){
+ // Prolongate to TPC
+ if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
+ seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
+ found++;
+ kUPDATE = kTRUE;
+ }
+
+ // Update the friend track
+ if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
+ TObject *o = 0x0; Int_t ic = 0;
+ AliTRDtrackV1 *calibTrack = 0x0;
+ while((o = seed->GetCalibObject(ic++))){
+ if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
+ calibTrack->SetTrackHigh(track.GetTrackHigh());
+ }
+ }
+ }
+
+ // Prolongate to TPC without update
+ if(!kUPDATE) {
+ AliTRDtrackV1 tt(*seed);
+ if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
+ }
+ }
+ AliInfo(Form("Number of loaded seeds: %d",nseed));
+ AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
+
+ return 0;
}
-
//____________________________________________________________________
Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
{
- // Extrapolates the TRD track in the TPC direction.
- //
- // Parameters
- // t : the TRD track which has to be extrapolated
- //
- // Output
- // number of clusters attached to the track
- //
- // Detailed description
- //
- // Starting from current radial position of track <t> this function
- // extrapolates the track through the 6 TRD layers. The following steps
- // are being performed for each plane:
- // 1. prepare track:
- // a. get plane limits in the local x direction
- // b. check crossing sectors
- // c. check track inclination
- // 2. search tracklet in the tracker list (see GetTracklet() for details)
- // 3. evaluate material budget using the geo manager
- // 4. propagate and update track using the tracklet information.
- //
- // Debug level 2
- //
-
- Int_t nClustersExpected = 0;
- Int_t lastplane = 5; //GetLastPlane(&t);
- for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
- Int_t index = 0;
- AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
- if(!tracklet) continue;
- if(!tracklet->IsOK()) AliWarning("tracklet not OK");
-
- Double_t x = tracklet->GetX0();
- // reject tracklets which are not considered for inward refit
- if(x > t.GetX()+fgkMaxStep) continue;
-
- // append tracklet to track
- t.SetTracklet(tracklet, iplane, index);
-
- if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
- if (!AdjustSector(&t)) break;
-
- // Start global position
- Double_t xyz0[3];
- t.GetXYZ(xyz0);
-
- // End global position
- Double_t alpha = t.GetAlpha(), y, z;
- if (!t.GetProlongation(x,y,z)) break;
- Double_t xyz1[3];
- xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
- xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
- xyz1[2] = z;
-
- // Get material budget
- Double_t param[7];
- AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
- Double_t xrho= param[0]*param[4];
- Double_t xx0 = param[1]; // Get mean propagation parameters
-
- // Propagate and update
- t.PropagateTo(x, xx0, xrho);
- if (!AdjustSector(&t)) break;
-
- Double_t maxChi2 = t.GetPredictedChi2(tracklet);
- if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
- nClustersExpected += tracklet->GetN();
- }
- }
-
- if(AliTRDReconstructor::StreamLevel() > 1){
- Int_t index;
- for(int iplane=0; iplane<6; iplane++){
- AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
- if(!tracklet) continue;
- t.SetTracklet(tracklet, iplane, index);
- }
-
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- cstreamer << "FollowProlongation"
- << "EventNumber=" << eventNumber
- << "ncl=" << nClustersExpected
- << "track.=" << &t
- << "\n";
- }
-
- return nClustersExpected;
+ // Extrapolates the TRD track in the TPC direction.
+ //
+ // Parameters
+ // t : the TRD track which has to be extrapolated
+ //
+ // Output
+ // number of clusters attached to the track
+ //
+ // Detailed description
+ //
+ // Starting from current radial position of track <t> this function
+ // extrapolates the track through the 6 TRD layers. The following steps
+ // are being performed for each plane:
+ // 1. prepare track:
+ // a. get plane limits in the local x direction
+ // b. check crossing sectors
+ // c. check track inclination
+ // 2. search tracklet in the tracker list (see GetTracklet() for details)
+ // 3. evaluate material budget using the geo manager
+ // 4. propagate and update track using the tracklet information.
+ //
+ // Debug level 2
+ //
+
+ Bool_t kStoreIn = kTRUE;
+ Int_t nClustersExpected = 0;
+ for (Int_t iplane = kNPlanes; iplane--;) {
+ Int_t index = 0;
+ AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
+ if(!tracklet) continue;
+ if(!tracklet->IsOK()) AliWarning("tracklet not OK");
+
+ Double_t x = tracklet->GetX();//GetX0();
+ // reject tracklets which are not considered for inward refit
+ if(x > t.GetX()+fgkMaxStep) continue;
+
+ // append tracklet to track
+ t.SetTracklet(tracklet, index);
+
+ if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
+ if (!AdjustSector(&t)) break;
+
+ // Start global position
+ Double_t xyz0[3];
+ t.GetXYZ(xyz0);
+
+ // End global position
+ Double_t alpha = t.GetAlpha(), y, z;
+ if (!t.GetProlongation(x,y,z)) break;
+ Double_t xyz1[3];
+ xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
+ xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
+ xyz1[2] = z;
+
+ Double_t length = TMath::Sqrt(
+ (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) +
+ (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) +
+ (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2])
+ );
+ if(length>0.){
+ // Get material budget
+ Double_t param[7];
+ if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break;
+ Double_t xrho= param[0]*param[4];
+ Double_t xx0 = param[1]; // Get mean propagation parameters
+
+ // Propagate and update
+ t.PropagateTo(x, xx0, xrho);
+ if (!AdjustSector(&t)) break;
+ }
+ if(kStoreIn){
+ t.SetTrackHigh();
+ kStoreIn = kFALSE;
+ }
+
+ Double_t cov[3]; tracklet->GetCovAt(x, cov);
+ Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()};
+ Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
+ if (chi2 < 1e+10 && t.Update(p, cov, chi2)){
+ nClustersExpected += tracklet->GetN();
+ }
+ }
+
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
+ Int_t index;
+ for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){
+ AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
+ if(!tracklet) continue;
+ t.SetTracklet(tracklet, index);
+ }
+
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ AliTRDtrackV1 track(t);
+ track.SetOwner();
+ cstreamer << "FollowProlongation"
+ << "EventNumber=" << eventNumber
+ << "ncl=" << nClustersExpected
+ << "track.=" << &track
+ << "\n";
+ }
+
+ return nClustersExpected;
}
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
{
- // Extrapolates the TRD track in the TOF direction.
- //
- // Parameters
- // t : the TRD track which has to be extrapolated
- //
- // Output
- // number of clusters attached to the track
- //
- // Detailed description
- //
- // Starting from current radial position of track <t> this function
- // extrapolates the track through the 6 TRD layers. The following steps
- // are being performed for each plane:
- // 1. prepare track:
- // a. get plane limits in the local x direction
- // b. check crossing sectors
- // c. check track inclination
- // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
- // 3. evaluate material budget using the geo manager
- // 4. propagate and update track using the tracklet information.
- //
- // Debug level 2
- //
-
- Int_t nClustersExpected = 0;
- Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
- AliTRDtrackingChamber *chamber = 0x0;
-
- // Loop through the TRD planes
- for (Int_t iplane = 0; iplane < AliTRDgeometry::Nplan(); iplane++) {
- // BUILD TRACKLET IF NOT ALREADY BUILT
- Double_t x = 0., y, z, alpha;
- AliTRDseedV1 tracklet(*t.GetTracklet(iplane));
- if(!tracklet.IsOK()){
- alpha = t.GetAlpha();
- Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsect));
-
- if(!fTrSec[sector].GetNChambers()) continue;
-
- if((x = fTrSec[sector].GetX(iplane)) < 1.) continue;
-
- if (!t.GetProlongation(x, y, z)) break;
- Int_t stack = fGeom->GetChamber(z, iplane);
- Int_t nCandidates = stack >= 0 ? 1 : 2;
- z -= stack >= 0 ? 0. : 4.;
-
- for(int icham=0; icham<nCandidates; icham++, z+=8){
- if((stack = fGeom->GetChamber(z, iplane)) < 0) continue;
-
- if(!(chamber = fTrSec[sector].GetChamber(stack, iplane))) continue;
-
- if(chamber->GetNClusters() < fgNTimeBins*AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue;
-
- x = chamber->GetX();
-
- AliTRDpadPlane *pp = fGeom->GetPadPlane(iplane, stack);
- tracklet.SetTilt(TMath::Tan(-TMath::DegToRad()*pp->GetTiltingAngle()));
- tracklet.SetPadLength(pp->GetLengthIPad());
- tracklet.SetPlane(iplane);
- tracklet.SetX0(x);
- if(!tracklet.Init(&t)){
- t.SetStop(kTRUE);
- return nClustersExpected;
- }
- if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
- tracklet.Init(&t);
-
- if(tracklet.GetN() < fgNTimeBins * AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue;
-
- break;
- }
- }
- if(!tracklet.IsOK()){
- if(x < 1.) continue; //temporary
- if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break;
- if(!AdjustSector(&t)) break;
- if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) break;
- continue;
- }
-
- // Propagate closer to the current chamber if neccessary
- x -= clength;
- if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break;
- if (!AdjustSector(&t)) break;
- if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) break;
-
- // load tracklet to the tracker and the track
- Int_t index = SetTracklet(&tracklet);
- t.SetTracklet(&tracklet, iplane, index);
-
-
- // Calculate the mean material budget along the path inside the chamber
- //Calculate global entry and exit positions of the track in chamber (only track prolongation)
- Double_t xyz0[3]; // entry point
- t.GetXYZ(xyz0);
- alpha = t.GetAlpha();
- x = tracklet.GetX0();
- if (!t.GetProlongation(x, y, z)) break;
- Double_t xyz1[3]; // exit point
- xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
- xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
- xyz1[2] = z;
- Double_t param[7];
- AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
- // The mean propagation parameters
- Double_t xrho = param[0]*param[4]; // density*length
- Double_t xx0 = param[1]; // radiation length
-
- // Propagate and update track
- t.PropagateTo(x, xx0, xrho);
- if (!AdjustSector(&t)) break;
- Double_t maxChi2 = t.GetPredictedChi2(&tracklet);
- if (maxChi2<1e+10 && t.Update(&tracklet, maxChi2)){
- nClustersExpected += tracklet.GetN();
- t.SetTracklet(&tracklet, iplane, index);
- UpdateTracklet(&tracklet, index);
- }
- // Reset material budget if 2 consecutive gold
- if(iplane>0 && tracklet.GetN() + t.GetTracklet(iplane-1)->GetN() > 20) t.SetBudget(2, 0.);
-
- // Make backup of the track until is gold
- // TO DO update quality check of the track.
- // consider comparison with fTimeBinsRange
- Float_t ratio0 = tracklet.GetN() / Float_t(fgNTimeBins);
- //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
- //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
- //printf("ratio0 %f [> 0.8]\n", ratio0);
- //printf("ratio1 %f [> 0.6]\n", ratio1);
- //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
- //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
- //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
- //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
-
- if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
- (ratio0 > 0.8) &&
- //(ratio1 > 0.6) &&
- //(ratio0+ratio1 > 1.5) &&
- (t.GetNCross() == 0) &&
- (TMath::Abs(t.GetSnp()) < 0.85) &&
- (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
-
- } // end planes loop
-
- if(AliTRDReconstructor::StreamLevel() > 1){
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- cstreamer << "FollowBackProlongation"
- << "EventNumber=" << eventNumber
- << "ncl=" << nClustersExpected
- << "track.=" << &t
- << "\n";
- }
-
- return nClustersExpected;
+// Extrapolates/Build the TRD track in the TOF direction.
+//
+// Parameters
+// t : the TRD track which has to be extrapolated
+//
+// Output
+// number of clusters attached to the track
+//
+// Starting from current radial position of track <t> this function
+// extrapolates the track through the 6 TRD layers. The following steps
+// are being performed for each plane:
+// 1. Propagate track to the entrance of the next chamber:
+// - get chamber limits in the radial direction
+// - check crossing sectors
+// - check track inclination
+// - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary())
+// 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only
+// Kalman filter is needed and tracklets are already linked to the track this step is skipped.
+// 3. Fit tracklet using the information from the Kalman filter.
+// 4. Propagate and update track at reference radial position of the tracklet.
+// 5. Register tracklet with the tracker and track; update pulls monitoring.
+//
+// Observation
+// 1. During the propagation a bit map is filled detailing the status of the track in each TRD chamber. The following errors are being registered for each tracklet:
+// - AliTRDtrackV1::kProlongation : track prolongation failed
+// - AliTRDtrackV1::kPropagation : track prolongation failed
+// - AliTRDtrackV1::kAdjustSector : failed during sector crossing
+// - AliTRDtrackV1::kSnp : too large bending
+// - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet
+// - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet
+// - AliTRDtrackV1::kUnknown : anything which is not covered before
+// 2. By default the status of the track before first TRD update is saved.
+//
+// Debug level 2
+//
+// Author
+// Alexandru Bercuci <A.Bercuci@gsi.de>
+//
+
+ Int_t n = 0;
+ Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
+ AliTRDtrackingChamber *chamber = 0x0;
+
+ AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
+ // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
+ AliTRDseedV1 *tracklets[kNPlanes];
+ memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
+ for(Int_t ip = 0; ip < kNPlanes; ip++){
+ tracklets[ip] = t.GetTracklet(ip);
+ t.UnsetTracklet(ip);
+ }
+ Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE;
+
+ // Loop through the TRD layers
+ TGeoHMatrix *matrix = 0x0;
+ Double_t x, y, z;
+ for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
+ // rough estimate of the entry point
+ if (!t.GetProlongation(fR[ily], y, z)){
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kProlongation);
+ break;
+ }
+
+ // find sector / stack / detector
+ sm = t.GetSector();
+ // TODO cross check with y value !
+ stk = fGeom->GetStack(z, ily);
+ det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1;
+ matrix = det>=0 ? fGeom->GetClusterMatrix(det) : 0x0;
+
+ // check if supermodule/chamber is installed
+ if( !fGeom->GetSMstatus(sm) ||
+ stk<0. ||
+ fGeom->IsHole(ily, stk, sm) ||
+ !matrix ){
+ // propagate to the default radial position
+ if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kPropagation);
+ break;
+ }
+ if(!AdjustSector(&t)){
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kAdjustSector);
+ break;
+ }
+ if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kSnp);
+ break;
+ }
+ t.SetStatus(AliTRDtrackV1::kGeometry, ily);
+ continue;
+ }
+
+ // retrieve rotation matrix for the current chamber
+ Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.};
+ Double_t glb[] = {0., 0., 0.};
+ matrix->LocalToMaster(loc, glb);
+
+ // Propagate to the radial distance of the current layer
+ x = glb[0] - fgkMaxStep;
+ if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kPropagation);
+ break;
+ }
+ if(!AdjustSector(&t)){
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kAdjustSector);
+ break;
+ }
+ if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kSnp);
+ break;
+ }
+ Bool_t RECALCULATE = kFALSE;
+ if(sm != t.GetSector()){
+ sm = t.GetSector();
+ RECALCULATE = kTRUE;
+ }
+ if(stk != fGeom->GetStack(z, ily)){
+ stk = fGeom->GetStack(z, ily);
+ RECALCULATE = kTRUE;
+ }
+ if(RECALCULATE){
+ det = AliTRDgeometry::GetDetector(ily, stk, sm);
+ if(!(matrix = fGeom->GetClusterMatrix(det))){
+ t.SetStatus(AliTRDtrackV1::kGeometry, ily);
+ continue;
+ }
+ matrix->LocalToMaster(loc, glb);
+ x = glb[0] - fgkMaxStep;
+ }
+
+ // check if track is well inside fiducial volume
+ if (!t.GetProlongation(x+fgkMaxStep, y, z)) {
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kProlongation);
+ break;
+ }
+ if(fGeom->IsOnBoundary(det, y, z, .5)){
+ t.SetStatus(AliTRDtrackV1::kBoundary, ily);
+ continue;
+ }
+ // mark track as entering the FIDUCIAL volume of TRD
+ if(kStoreIn){
+ t.SetTrackLow();
+ kStoreIn = kFALSE;
+ }
+
+ ptrTracklet = tracklets[ily];
+ if(!ptrTracklet){ // BUILD TRACKLET
+ // check data in supermodule
+ if(!fTrSec[sm].GetNChambers()){
+ t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
+ continue;
+ }
+ if(fTrSec[sm].GetX(ily) < 1.){
+ t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
+ continue;
+ }
+
+ // check data in chamber
+ if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
+ t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
+ continue;
+ }
+ if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
+ t.SetStatus(AliTRDtrackV1::kNoClusters, ily);
+ continue;
+ }
+ // build tracklet
+ ptrTracklet = new(&tracklet) AliTRDseedV1(det);
+ ptrTracklet->SetReconstructor(fReconstructor);
+ ptrTracklet->SetKink(t.IsKink());
+ ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
+ ptrTracklet->SetX0(glb[0]+driftLength);
+ if(!tracklet.Init(&t)){
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kTrackletInit);
+ break;
+ }
+ if(!tracklet.AttachClusters(chamber, kTRUE)){
+ t.SetStatus(AliTRDtrackV1::kNoAttach, ily);
+ continue;
+ }
+ if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){
+ t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily);
+ continue;
+ }
+ ptrTracklet->UpdateUsed();
+ }
+ // propagate track to the radial position of the tracklet
+ ptrTracklet->UseClusters(); // TODO ? do we need this here ?
+ // fit tracklet no tilt correction
+ if(!ptrTracklet->Fit(kFALSE)){
+ t.SetStatus(AliTRDtrackV1::kNoFit, ily);
+ continue;
+ }
+ x = ptrTracklet->GetX(); //GetX0();
+ if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) {
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kPropagation);
+ break;
+ }
+ if(!AdjustSector(&t)) {
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kAdjustSector);
+ break;
+ }
+ if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) {
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kSnp);
+ break;
+ }
+ if(kPropagateIn){
+ t.SetTrackLow();
+ kPropagateIn = kFALSE;
+ }
+ Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
+ Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
+ Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 2){
+ Double_t ytrack = ptrTracklet->GetYref(0);
+ Double_t ztrack = ptrTracklet->GetZref(0);
+ Double_t ytracklet = ptrTracklet->GetYfit(0);
+ Double_t ztracklet = ptrTracklet->GetZfit(0);
+ Double_t phitrack = ptrTracklet->GetYref(1);
+ Double_t phitracklet = ptrTracklet->GetYfit(1);
+ Double_t thetatrack = ptrTracklet->GetZref(1);
+ Double_t thetatracklet = ptrTracklet->GetZfit(1);
+
+ TTreeSRedirector &mystreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ mystreamer << "FollowBackProlongation1"
+ << "il=" << ily
+ << "x=" << x
+ << "ytrack=" << ytrack
+ << "ztrack=" << ztrack
+ << "ytracklet=" << ytracklet
+ << "ztracklet=" << ztracklet
+ << "phitrack=" << phitrack
+ << "thetatrack=" << thetatrack
+ << "phitracklet=" << phitracklet
+ << "thetatracklet=" << thetatracklet
+ << "chi2=" << chi2
+ << "\n";
+ }
+ // update Kalman with the TRD measurement
+ if(chi2>1e+10){ // TODO
+ t.SetStatus(AliTRDtrackV1::kChi2, ily);
+ continue;
+ }
+ if(!t.Update(p, cov, chi2)) {
+ n=-1;
+ t.SetStatus(AliTRDtrackV1::kUpdate);
+ break;
+ }
+ // fill residuals ?!
+ AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
+
+
+ // load tracklet to the tracker
+ ptrTracklet->Update(&t);
+ ptrTracklet = SetTracklet(ptrTracklet);
+ t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
+ n += ptrTracklet->GetN();
+
+ // Reset material budget if 2 consecutive gold
+// if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
+
+ // Make backup of the track until is gold
+ // TO DO update quality check of the track.
+ // consider comparison with fTimeBinsRange
+ Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
+ //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
+
+ if( (chi2 < 18.0) &&
+ (ratio0 > 0.8) &&
+ //(ratio1 > 0.6) &&
+ //(ratio0+ratio1 > 1.5) &&
+ (t.GetNCross() == 0) &&
+ (TMath::Abs(t.GetSnp()) < 0.85) &&
+ (t.GetNumberOfClusters() > 20)){
+ t.MakeBackupTrack();
+ }
+ } // end layers loop
+ //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD());
+ //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n");
+
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ AliTRDtrackV1 track(t);
+ track.SetOwner();
+ cstreamer << "FollowBackProlongation"
+ << "EventNumber=" << eventNumber
+ << "ncl=" << n
+ << "track.=" << &track
+ << "\n";
+ }
+
+ return n;
}
//_________________________________________________________________________
Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
- //
- // Fits a Riemann-circle to the given points without tilting pad correction.
- // The fit is performed using an instance of the class AliRieman (equations
- // and transformations see documentation of this class)
- // Afterwards all the tracklets are Updated
- //
- // Parameters: - Array of tracklets (AliTRDseedV1)
- // - Storage for the chi2 values (beginning with direction z)
- // - Seeding configuration
- // Output: - The curvature
- //
- AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
- fitter->Reset();
- Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
- Int_t *ppl = &allplanes[0];
- Int_t maxLayers = 6;
- if(planes){
- maxLayers = 4;
- ppl = planes;
- }
- for(Int_t il = 0; il < maxLayers; il++){
- if(!tracklets[ppl[il]].IsOK()) continue;
- fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
- }
- fitter->Update();
- // Set the reference position of the fit and calculate the chi2 values
- memset(chi2, 0, sizeof(Double_t) * 2);
- for(Int_t il = 0; il < maxLayers; il++){
- // Reference positions
- tracklets[ppl[il]].Init(fitter);
-
- // chi2
- if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
- chi2[0] += tracklets[ppl[il]].GetChi2Y();
- chi2[1] += tracklets[ppl[il]].GetChi2Z();
- }
- return fitter->GetC();
+ //
+ // Fits a Riemann-circle to the given points without tilting pad correction.
+ // The fit is performed using an instance of the class AliRieman (equations
+ // and transformations see documentation of this class)
+ // Afterwards all the tracklets are Updated
+ //
+ // Parameters: - Array of tracklets (AliTRDseedV1)
+ // - Storage for the chi2 values (beginning with direction z)
+ // - Seeding configuration
+ // Output: - The curvature
+ //
+ AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
+ fitter->Reset();
+ Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
+ Int_t *ppl = &allplanes[0];
+ Int_t maxLayers = 6;
+ if(planes){
+ maxLayers = 4;
+ ppl = planes;
+ }
+ for(Int_t il = 0; il < maxLayers; il++){
+ if(!tracklets[ppl[il]].IsOK()) continue;
+ fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10);
+ }
+ fitter->Update();
+ // Set the reference position of the fit and calculate the chi2 values
+ memset(chi2, 0, sizeof(Double_t) * 2);
+ for(Int_t il = 0; il < maxLayers; il++){
+ // Reference positions
+ tracklets[ppl[il]].Init(fitter);
+
+ // chi2
+ if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
+ chi2[0] += tracklets[ppl[il]].GetChi2Y();
+ chi2[1] += tracklets[ppl[il]].GetChi2Z();
+ }
+ return fitter->GetC();
}
//_________________________________________________________________________
void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
{
- //
- // Performs a Riemann helix fit using the seedclusters as spacepoints
- // Afterwards the chi2 values are calculated and the seeds are updated
- //
- // Parameters: - The four seedclusters
- // - The tracklet array (AliTRDseedV1)
- // - The seeding configuration
- // - Chi2 array
- //
- // debug level 2
- //
- AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
- fitter->Reset();
- for(Int_t i = 0; i < 4; i++)
- fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
- fitter->Update();
-
-
- // Update the seed and calculated the chi2 value
- chi2[0] = 0; chi2[1] = 0;
- for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
- // chi2
- chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
- chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
- }
+ //
+ // Performs a Riemann helix fit using the seedclusters as spacepoints
+ // Afterwards the chi2 values are calculated and the seeds are updated
+ //
+ // Parameters: - The four seedclusters
+ // - The tracklet array (AliTRDseedV1)
+ // - The seeding configuration
+ // - Chi2 array
+ //
+ // debug level 2
+ //
+ AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
+ fitter->Reset();
+ for(Int_t i = 0; i < 4; i++){
+ fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.);
+ }
+ fitter->Update();
+
+
+ // Update the seed and calculated the chi2 value
+ chi2[0] = 0; chi2[1] = 0;
+ for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
+ // chi2
+ chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
+ chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
+ }
}
//_________________________________________________________________________
Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
{
- //
- // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
- // assumed that the vertex position is set to 0.
- // This method is very usefull for high-pt particles
- // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
- // x0, y0: Center of the circle
- // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
- // zc: center of the pad row
- // Equation which has to be fitted (after transformation):
- // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
- // Transformation:
- // t = 1/(x^2 + y^2)
- // u = 2 * x * t
- // v = 2 * x * tan(phiT) * t
- // Parameters in the equation:
- // a = -1/y0, b = x0/y0, e = dz/dx
- //
- // The Curvature is calculated by the following equation:
- // - curv = a/Sqrt(b^2 + 1) = 1/R
- // Parameters: - the 6 tracklets
- // - the Vertex constraint
- // Output: - the Chi2 value of the track
- //
- // debug level 5
- //
-
- TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
- fitter->StoreData(kTRUE);
- fitter->ClearPoints();
- AliTRDcluster *cl = 0x0;
-
- Float_t x, y, z, w, t, error, tilt;
- Double_t uvt[2];
- Int_t nPoints = 0;
- for(Int_t ipl = 0; ipl < AliTRDgeometry::kNplan; ipl++){
- if(!tracklets[ipl].IsOK()) continue;
- for(Int_t itb = 0; itb < fgNTimeBins; itb++){
- if(!tracklets[ipl].IsUsable(itb)) continue;
- cl = tracklets[ipl].GetClusters(itb);
- x = cl->GetX();
- y = cl->GetY();
- z = cl->GetZ();
- tilt = tracklets[ipl].GetTilt();
- // Transformation
- t = 1./(x * x + y * y);
- uvt[0] = 2. * x * t;
- uvt[1] = 2. * x * t * tilt ;
- w = 2. * (y + tilt * (z - zVertex)) * t;
- error = 2. * 0.2 * t;
- fitter->AddPoint(uvt, w, error);
- nPoints++;
- }
- }
- fitter->Eval();
-
- // Calculate curvature
- Double_t a = fitter->GetParameter(0);
- Double_t b = fitter->GetParameter(1);
- Double_t curvature = a/TMath::Sqrt(b*b + 1);
-
- Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
- for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
- tracklets[ip].SetCC(curvature);
-
- if(AliTRDReconstructor::StreamLevel() >= 5){
- //Linear Model on z-direction
- Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
- Double_t slope = fitter->GetParameter(2);
- Double_t zref = slope * xref;
- Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TTreeSRedirector &treeStreamer = *fgDebugStreamer;
- treeStreamer << "FitTiltedRiemanConstraint"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "Curvature=" << curvature
- << "Chi2Track=" << chi2track
- << "Chi2Z=" << chi2Z
- << "zref=" << zref
- << "\n";
- }
- return chi2track;
+ //
+ // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
+ // assumed that the vertex position is set to 0.
+ // This method is very usefull for high-pt particles
+ // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
+ // x0, y0: Center of the circle
+ // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
+ // zc: center of the pad row
+ // Equation which has to be fitted (after transformation):
+ // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
+ // Transformation:
+ // t = 1/(x^2 + y^2)
+ // u = 2 * x * t
+ // v = 2 * x * tan(phiT) * t
+ // Parameters in the equation:
+ // a = -1/y0, b = x0/y0, e = dz/dx
+ //
+ // The Curvature is calculated by the following equation:
+ // - curv = a/Sqrt(b^2 + 1) = 1/R
+ // Parameters: - the 6 tracklets
+ // - the Vertex constraint
+ // Output: - the Chi2 value of the track
+ //
+ // debug level 5
+ //
+
+ TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
+ fitter->StoreData(kTRUE);
+ fitter->ClearPoints();
+ AliTRDcluster *cl = 0x0;
+
+ Float_t x, y, z, w, t, error, tilt;
+ Double_t uvt[2];
+ Int_t nPoints = 0;
+ for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
+ if(!tracklets[ilr].IsOK()) continue;
+ for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
+ if(!tracklets[ilr].IsUsable(itb)) continue;
+ cl = tracklets[ilr].GetClusters(itb);
+ if(!cl->IsInChamber()) continue;
+ x = cl->GetX();
+ y = cl->GetY();
+ z = cl->GetZ();
+ tilt = tracklets[ilr].GetTilt();
+ // Transformation
+ t = 1./(x * x + y * y);
+ uvt[0] = 2. * x * t;
+ uvt[1] = 2. * x * t * tilt ;
+ w = 2. * (y + tilt * (z - zVertex)) * t;
+ error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t;
+ fitter->AddPoint(uvt, w, error);
+ nPoints++;
+ }
+ }
+ fitter->Eval();
+
+ // Calculate curvature
+ Double_t a = fitter->GetParameter(0);
+ Double_t b = fitter->GetParameter(1);
+ Double_t curvature = a/TMath::Sqrt(b*b + 1);
+
+ Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
+ for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
+ tracklets[ip].SetC(curvature);
+
+/* if(fReconstructor->GetStreamLevel() >= 5){
+ //Linear Model on z-direction
+ Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
+ Double_t slope = fitter->GetParameter(2);
+ Double_t zref = slope * xref;
+ Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ treeStreamer << "FitTiltedRiemanConstraint"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "Curvature=" << curvature
+ << "Chi2Track=" << chi2track
+ << "Chi2Z=" << chi2Z
+ << "zref=" << zref
+ << "\n";
+ }*/
+ return chi2track;
}
//_________________________________________________________________________
Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
{
- //
- // Performs a Riemann fit taking tilting pad correction into account
- // The equation of a Riemann circle, where the y position is substituted by the
- // measured y-position taking pad tilting into account, has to be transformed
- // into a 4-dimensional hyperplane equation
- // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
- // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
- // zc: center of the pad row
- // zt: z-position of the track
- // The z-position of the track is assumed to be linear dependent on the x-position
- // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
- // Transformation: u = 2 * x * t
- // v = 2 * tan(phiT) * t
- // w = 2 * tan(phiT) * (x - xref) * t
- // t = 1 / (x^2 + ymeas^2)
- // Parameters: a = -1/y0
- // b = x0/y0
- // c = (R^2 -x0^2 - y0^2)/y0
- // d = offset
- // e = dz/dx
- // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
- // results from the simple riemann fit. Afterwards the fit is redone.
- // The curvature is calculated according to the formula:
- // curv = a/(1 + b^2 + c*a) = 1/R
- //
- // Paramters: - Array of tracklets (connected to the track candidate)
- // - Flag selecting the error definition
- // Output: - Chi2 values of the track (in Parameter list)
- //
- TLinearFitter *fitter = GetTiltedRiemanFitter();
- fitter->StoreData(kTRUE);
- fitter->ClearPoints();
- AliTRDLeastSquare zfitter;
- AliTRDcluster *cl = 0x0;
-
- Double_t xref = CalculateReferenceX(tracklets);
- Double_t x, y, z, t, tilt, dx, w, we;
- Double_t uvt[4];
- Int_t nPoints = 0;
- // Containers for Least-square fitter
- for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
- if(!tracklets[ipl].IsOK()) continue;
- for(Int_t itb = 0; itb < fgNTimeBins; itb++){
- if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
- if (!tracklets[ipl].IsUsable(itb)) continue;
- x = cl->GetX();
- y = cl->GetY();
- z = cl->GetZ();
- tilt = tracklets[ipl].GetTilt();
- dx = x - xref;
- // Transformation
- t = 1./(x*x + y*y);
- uvt[0] = 2. * x * t;
- uvt[1] = t;
- uvt[2] = 2. * tilt * t;
- uvt[3] = 2. * tilt * dx * t;
- w = 2. * (y + tilt*z) * t;
- // error definition changes for the different calls
- we = 2. * t;
- we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
- fitter->AddPoint(uvt, w, we);
- zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
- nPoints++;
- }
- }
- fitter->Eval();
- zfitter.Eval();
-
- Double_t offset = fitter->GetParameter(3);
- Double_t slope = fitter->GetParameter(4);
-
- // Linear fitter - not possible to make boundaries
- // Do not accept non possible z and dzdx combinations
- Bool_t acceptablez = kTRUE;
- Double_t zref = 0.0;
- for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
- if(!tracklets[iLayer].IsOK()) continue;
- zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
- if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
- acceptablez = kFALSE;
- }
- if (!acceptablez) {
- Double_t dzmf = zfitter.GetFunctionParameter(1);
- Double_t zmf = zfitter.GetFunctionValue(&xref);
- fgTiltedRieman->FixParameter(3, zmf);
- fgTiltedRieman->FixParameter(4, dzmf);
- fitter->Eval();
- fitter->ReleaseParameter(3);
- fitter->ReleaseParameter(4);
- offset = fitter->GetParameter(3);
- slope = fitter->GetParameter(4);
- }
+ //
+ // Performs a Riemann fit taking tilting pad correction into account
+ // The equation of a Riemann circle, where the y position is substituted by the
+ // measured y-position taking pad tilting into account, has to be transformed
+ // into a 4-dimensional hyperplane equation
+ // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
+ // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
+ // zc: center of the pad row
+ // zt: z-position of the track
+ // The z-position of the track is assumed to be linear dependent on the x-position
+ // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
+ // Transformation: u = 2 * x * t
+ // v = 2 * tan(phiT) * t
+ // w = 2 * tan(phiT) * (x - xref) * t
+ // t = 1 / (x^2 + ymeas^2)
+ // Parameters: a = -1/y0
+ // b = x0/y0
+ // c = (R^2 -x0^2 - y0^2)/y0
+ // d = offset
+ // e = dz/dx
+ // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
+ // results from the simple riemann fit. Afterwards the fit is redone.
+ // The curvature is calculated according to the formula:
+ // curv = a/(1 + b^2 + c*a) = 1/R
+ //
+ // Paramters: - Array of tracklets (connected to the track candidate)
+ // - Flag selecting the error definition
+ // Output: - Chi2 values of the track (in Parameter list)
+ //
+ TLinearFitter *fitter = GetTiltedRiemanFitter();
+ fitter->StoreData(kTRUE);
+ fitter->ClearPoints();
+ AliTRDLeastSquare zfitter;
+ AliTRDcluster *cl = 0x0;
+
+ Double_t xref = CalculateReferenceX(tracklets);
+ Double_t x, y, z, t, tilt, dx, w, we, erry, errz;
+ Double_t uvt[4], sumPolY[5], sumPolZ[3];
+ memset(sumPolY, 0, sizeof(Double_t) * 5);
+ memset(sumPolZ, 0, sizeof(Double_t) * 3);
+ Int_t nPoints = 0;
+ // Containers for Least-square fitter
+ for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
+ if(!tracklets[ipl].IsOK()) continue;
+ tilt = tracklets[ipl].GetTilt();
+ for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
+ if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
+ if(!cl->IsInChamber()) continue;
+ if (!tracklets[ipl].IsUsable(itb)) continue;
+ x = cl->GetX();
+ y = cl->GetY();
+ z = cl->GetZ();
+ dx = x - xref;
+ // Transformation
+ t = 1./(x*x + y*y);
+ uvt[0] = 2. * x * t;
+ uvt[1] = t;
+ uvt[2] = 2. * tilt * t;
+ uvt[3] = 2. * tilt * dx * t;
+ w = 2. * (y + tilt*z) * t;
+ // error definition changes for the different calls
+ we = 2. * t;
+ we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2;
+ fitter->AddPoint(uvt, w, we);
+ zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
+ // adding points for covariance matrix estimation
+ erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration)
+ erry *= erry;
+ errz = 1./cl->GetSigmaZ2();
+ for(Int_t ipol = 0; ipol < 5; ipol++){
+ sumPolY[ipol] += erry;
+ erry *= x;
+ if(ipol < 3){
+ sumPolZ[ipol] += errz;
+ errz *= x;
+ }
+ }
+ nPoints++;
+ }
+ }
+ fitter->Eval();
+ zfitter.Eval();
+
+ Double_t offset = fitter->GetParameter(3);
+ Double_t slope = fitter->GetParameter(4);
+
+ // Linear fitter - not possible to make boundaries
+ // Do not accept non possible z and dzdx combinations
+ Bool_t acceptablez = kTRUE;
+ Double_t zref = 0.0;
+ for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
+ if(!tracklets[iLayer].IsOK()) continue;
+ zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
+ if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
+ acceptablez = kFALSE;
+ }
+ if (!acceptablez) {
+ Double_t dzmf = zfitter.GetFunctionParameter(1);
+ Double_t zmf = zfitter.GetFunctionValue(&xref);
+ fgTiltedRieman->FixParameter(3, zmf);
+ fgTiltedRieman->FixParameter(4, dzmf);
+ fitter->Eval();
+ fitter->ReleaseParameter(3);
+ fitter->ReleaseParameter(4);
+ offset = fitter->GetParameter(3);
+ slope = fitter->GetParameter(4);
+ }
+
+ // Calculate Curvarture
+ Double_t a = fitter->GetParameter(0);
+ Double_t b = fitter->GetParameter(1);
+ Double_t c = fitter->GetParameter(2);
+ Double_t curvature = 1.0 + b*b - c*a;
+ if (curvature > 0.0)
+ curvature = a / TMath::Sqrt(curvature);
+
+ Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
+
+ // Prepare error calculation
+ TMatrixD covarPolY(3,3);
+ covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4];
+ covarPolY(0,1) = covarPolY(1,0) = sumPolY[1];
+ covarPolY(0,2) = covarPolY(2,0) = sumPolY[2];
+ covarPolY(2,1) = covarPolY(1,2) = sumPolY[3];
+ covarPolY.Invert();
+ TMatrixD covarPolZ(2,2);
+ covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2];
+ covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1];
+ covarPolZ.Invert();
+
+ // Update the tracklets
+ Double_t x1, dy, dz;
+ Double_t cov[15];
+ memset(cov, 0, sizeof(Double_t) * 15);
+ for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
+
+ x = tracklets[iLayer].GetX0();
+ x1 = x - xref;
+ y = 0;
+ z = 0;
+ dy = 0;
+ dz = 0;
+ memset(cov, 0, sizeof(Double_t) * 3);
+ TMatrixD transform(3,3);
+ transform(0,0) = 1;
+ transform(0,1) = x;
+ transform(0,2) = x*x;
+ transform(1,1) = 1;
+ transform(1,2) = x;
+ transform(2,2) = 1;
+ TMatrixD covariance(transform, TMatrixD::kMult, covarPolY);
+ covariance *= transform.T();
+ TMatrixD transformZ(2,2);
+ transformZ(0,0) = transformZ(1,1) = 1;
+ transformZ(0,1) = x;
+ TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ);
+ covarZ *= transformZ.T();
+ // y: R^2 = (x - x0)^2 + (y - y0)^2
+ // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
+ // R = Sqrt() = 1/Curvature
+ // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
+ Double_t res = (x * a + b); // = (x - x0)/y0
+ res *= res;
+ res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
+ if (res >= 0) {
+ res = TMath::Sqrt(res);
+ y = (1.0 - res) / a;
+ }
+ cov[0] = covariance(0,0);
+ cov[2] = covarZ(0,0);
+ cov[1] = 0.;
+
+ // dy: R^2 = (x - x0)^2 + (y - y0)^2
+ // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
+ // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
+ // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
+ // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
+ Double_t x0 = -b / a;
+ if (-c * a + b * b + 1 > 0) {
+ if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
+ Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
+ if (a < 0) yderiv *= -1.0;
+ dy = yderiv;
+ }
+ }
+ z = offset + slope * (x - xref);
+ dz = slope;
+ tracklets[iLayer].SetYref(0, y);
+ tracklets[iLayer].SetYref(1, dy);
+ tracklets[iLayer].SetZref(0, z);
+ tracklets[iLayer].SetZref(1, dz);
+ tracklets[iLayer].SetC(curvature);
+ tracklets[iLayer].SetCovRef(cov);
+ tracklets[iLayer].SetChi2(chi2track);
+ }
+
+/* if(fReconstructor->GetStreamLevel() >=5){
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
+ cstreamer << "FitTiltedRieman0"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "xref=" << xref
+ << "Chi2Z=" << chi2z
+ << "\n";
+ }*/
+ return chi2track;
+}
- // Calculate Curvarture
- Double_t a = fitter->GetParameter(0);
- Double_t b = fitter->GetParameter(1);
- Double_t c = fitter->GetParameter(2);
- Double_t curvature = 1.0 + b*b - c*a;
- if (curvature > 0.0)
- curvature = a / TMath::Sqrt(curvature);
-
- Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
-
- // Update the tracklets
- Double_t dy, dz;
- for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
-
- x = tracklets[iLayer].GetX0();
- y = 0;
- z = 0;
- dy = 0;
- dz = 0;
-
- // y: R^2 = (x - x0)^2 + (y - y0)^2
- // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
- // R = Sqrt() = 1/Curvature
- // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
- Double_t res = (x * a + b); // = (x - x0)/y0
- res *= res;
- res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
- if (res >= 0) {
- res = TMath::Sqrt(res);
- y = (1.0 - res) / a;
- }
-
- // dy: R^2 = (x - x0)^2 + (y - y0)^2
- // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
- // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
- // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
- // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
- Double_t x0 = -b / a;
- if (-c * a + b * b + 1 > 0) {
- if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
- Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
- if (a < 0) yderiv *= -1.0;
- dy = yderiv;
- }
- }
- z = offset + slope * (x - xref);
- dz = slope;
- tracklets[iLayer].SetYref(0, y);
- tracklets[iLayer].SetYref(1, dy);
- tracklets[iLayer].SetZref(0, z);
- tracklets[iLayer].SetZref(1, dz);
- tracklets[iLayer].SetC(curvature);
- tracklets[iLayer].SetChi2(chi2track);
- }
-
- if(AliTRDReconstructor::StreamLevel() >=5){
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
- cstreamer << "FitTiltedRieman0"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "xref=" << xref
- << "Chi2Z=" << chi2z
- << "\n";
- }
- return chi2track;
+
+//____________________________________________________________________
+Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
+{
+ AliTRDLeastSquare yfitter, zfitter;
+ AliTRDcluster *cl = 0x0;
+
+ AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
+ if(!tracklets){
+ for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
+ if(!(tracklet = track->GetTracklet(ipl))) continue;
+ if(!tracklet->IsOK()) continue;
+ new(&work[ipl]) AliTRDseedV1(*tracklet);
+ }
+ tracklets = &work[0];
+ }
+
+ Double_t xref = CalculateReferenceX(tracklets);
+ Double_t x, y, z, dx, ye, yr, tilt;
+ for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
+ if(!tracklets[ipl].IsOK()) continue;
+ for(Int_t itb = 0; itb < fgNTimeBins; itb++){
+ if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
+ if (!tracklets[ipl].IsUsable(itb)) continue;
+ x = cl->GetX();
+ z = cl->GetZ();
+ dx = x - xref;
+ zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
+ }
+ }
+ zfitter.Eval();
+ Double_t z0 = zfitter.GetFunctionParameter(0);
+ Double_t dzdx = zfitter.GetFunctionParameter(1);
+ for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
+ if(!tracklets[ipl].IsOK()) continue;
+ for(Int_t itb = 0; itb < fgNTimeBins; itb++){
+ if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
+ if (!tracklets[ipl].IsUsable(itb)) continue;
+ x = cl->GetX();
+ y = cl->GetY();
+ z = cl->GetZ();
+ tilt = tracklets[ipl].GetTilt();
+ dx = x - xref;
+ yr = y + tilt*(z - z0 - dzdx*dx);
+ // error definition changes for the different calls
+ ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
+ ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
+ yfitter.AddPoint(&dx, yr, ye);
+ }
+ }
+ yfitter.Eval();
+ Double_t y0 = yfitter.GetFunctionParameter(0);
+ Double_t dydx = yfitter.GetFunctionParameter(1);
+ Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
+
+ //update track points array
+ if(np && points){
+ Float_t xyz[3];
+ for(int ip=0; ip<np; ip++){
+ points[ip].GetXYZ(xyz);
+ xyz[1] = y0 + dydx * (xyz[0] - xref);
+ xyz[2] = z0 + dzdx * (xyz[0] - xref);
+ points[ip].SetXYZ(xyz);
+ }
+ }
+ return chi2;
+}
+
+
+//_________________________________________________________________________
+Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
+{
+//
+// Performs a Riemann fit taking tilting pad correction into account
+//
+// Paramters: - Array of tracklets (connected to the track candidate)
+// - Flag selecting the error definition
+// Output: - Chi2 values of the track (in Parameter list)
+//
+// The equations which has to be solved simultaneously are:
+// BEGIN_LATEX
+// R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2}
+// y^{*} = y - tg(h)(z - z_{t})
+// z_{t} = z_{0}+dzdx*(x-x_{r})
+// END_LATEX
+// with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle,
+// R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the
+// track in the x-z plane. Using the following transformations
+// BEGIN_LATEX
+// t = 1 / (x^{2} + y^{2})
+// u = 2 * x * t
+// v = 2 * tan(h) * t
+// w = 2 * tan(h) * (x - x_{r}) * t
+// END_LATEX
+// One gets the following linear equation
+// BEGIN_LATEX
+// a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t
+// END_LATEX
+// where the coefficients have the following meaning
+// BEGIN_LATEX
+// a = -1/y_{0}
+// b = x_{0}/y_{0}
+// c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0}
+// d = z_{0}
+// e = dz/dx
+// END_LATEX
+// The error calculation for the free term is thus
+// BEGIN_LATEX
+// #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t
+// END_LATEX
+//
+// From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according
+// to the formula:
+// BEGIN_LATEX
+// C = 1/R = a/(1 + b^{2} + c*a)
+// END_LATEX
+//
+// Authors
+// M.Ivanov <M.Ivanov@gsi.de>
+// A.Bercuci <A.Bercuci@gsi.de>
+// M.Fasel <M.Fasel@gsi.de>
+
+ TLinearFitter *fitter = GetTiltedRiemanFitter();
+ fitter->StoreData(kTRUE);
+ fitter->ClearPoints();
+ AliTRDLeastSquare zfitter;
+ AliTRDcluster *cl = 0x0;
+
+ AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
+ if(!tracklets){
+ for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
+ if(!(tracklet = track->GetTracklet(ipl))) continue;
+ if(!tracklet->IsOK()) continue;
+ new(&work[ipl]) AliTRDseedV1(*tracklet);
+ }
+ tracklets = &work[0];
+ }
+
+ Double_t xref = CalculateReferenceX(tracklets);
+ Double_t x, y, z, t, tilt, dx, w, we;
+ Double_t uvt[4];
+ Int_t nPoints = 0;
+ // Containers for Least-square fitter
+ for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
+ if(!tracklets[ipl].IsOK()) continue;
+ for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
+ if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
+ if (!tracklets[ipl].IsUsable(itb)) continue;
+ x = cl->GetX();
+ y = cl->GetY();
+ z = cl->GetZ();
+ tilt = tracklets[ipl].GetTilt();
+ dx = x - xref;
+ // Transformation
+ t = 1./(x*x + y*y);
+ uvt[0] = 2. * x * t;
+ uvt[1] = t;
+ uvt[2] = 2. * tilt * t;
+ uvt[3] = 2. * tilt * dx * t;
+ w = 2. * (y + tilt*z) * t;
+ // error definition changes for the different calls
+ we = 2. * t;
+ we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2;
+ fitter->AddPoint(uvt, w, we);
+ zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
+ nPoints++;
+ }
+ }
+ if(fitter->Eval()) return 1.E10;
+
+ Double_t z0 = fitter->GetParameter(3);
+ Double_t dzdx = fitter->GetParameter(4);
+
+
+ // Linear fitter - not possible to make boundaries
+ // Do not accept non possible z and dzdx combinations
+ Bool_t accept = kTRUE;
+ Double_t zref = 0.0;
+ for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
+ if(!tracklets[iLayer].IsOK()) continue;
+ zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
+ if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
+ accept = kFALSE;
+ }
+ if (!accept) {
+ zfitter.Eval();
+ Double_t dzmf = zfitter.GetFunctionParameter(1);
+ Double_t zmf = zfitter.GetFunctionValue(&xref);
+ fitter->FixParameter(3, zmf);
+ fitter->FixParameter(4, dzmf);
+ fitter->Eval();
+ fitter->ReleaseParameter(3);
+ fitter->ReleaseParameter(4);
+ z0 = fitter->GetParameter(3); // = zmf ?
+ dzdx = fitter->GetParameter(4); // = dzmf ?
+ }
+
+ // Calculate Curvature
+ Double_t a = fitter->GetParameter(0);
+ Double_t b = fitter->GetParameter(1);
+ Double_t c = fitter->GetParameter(2);
+ Double_t y0 = 1. / a;
+ Double_t x0 = -b * y0;
+ Double_t tmp = y0*y0 + x0*x0 - c*y0;
+ if(tmp<=0.) return 1.E10;
+ Double_t R = TMath::Sqrt(tmp);
+ Double_t C = 1.0 + b*b - c*a;
+ if (C > 0.0) C = a / TMath::Sqrt(C);
+
+ // Calculate chi2 of the fit
+ Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
+
+ // Update the tracklets
+ if(!track){
+ for(Int_t ip = 0; ip < kNPlanes; ip++) {
+ x = tracklets[ip].GetX0();
+ tmp = R*R-(x-x0)*(x-x0);
+ if(tmp <= 0.) continue;
+ tmp = TMath::Sqrt(tmp);
+
+ // y: R^2 = (x - x0)^2 + (y - y0)^2
+ // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
+ tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
+ // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
+ tracklets[ip].SetYref(1, (x - x0) / tmp);
+ tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
+ tracklets[ip].SetZref(1, dzdx);
+ tracklets[ip].SetC(C);
+ tracklets[ip].SetChi2(chi2);
+ }
+ }
+ //update track points array
+ if(np && points){
+ Float_t xyz[3];
+ for(int ip=0; ip<np; ip++){
+ points[ip].GetXYZ(xyz);
+ xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((R-(xyz[0]-x0))*(R+(xyz[0]-x0)));
+ xyz[2] = z0 + dzdx * (xyz[0] - xref);
+ points[ip].SetXYZ(xyz);
+ }
+ }
+
+ return chi2;
+}
+
+
+//____________________________________________________________________
+Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
+{
+// Kalman filter implementation for the TRD.
+// It returns the positions of the fit in the array "points"
+//
+// Author : A.Bercuci@gsi.de
+
+ // printf("Start track @ x[%f]\n", track->GetX());
+
+ //prepare marker points along the track
+ Int_t ip = np ? 0 : 1;
+ while(ip<np){
+ if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
+ //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
+ ip++;
+ }
+ //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
+
+
+ AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
+
+ //Loop through the TRD planes
+ for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
+ // GET TRACKLET OR BUILT IT
+ Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
+ if(tracklets){
+ if(!(ptrTracklet = &tracklets[iplane])) continue;
+ }else{
+ if(!(ptrTracklet = track->GetTracklet(iplane))){
+ /*AliTRDtrackerV1 *tracker = 0x0;
+ if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
+ ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
+ if(!tracker->MakeTracklet(ptrTracklet, track)) */
+ continue;
+ }
+ }
+ if(!ptrTracklet->IsOK()) continue;
+
+ Double_t x = ptrTracklet->GetX0();
+
+ while(ip < np){
+ //don't do anything if next marker is after next update point.
+ if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
+ if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
+
+ Double_t xyz[3]; // should also get the covariance
+ track->GetXYZ(xyz);
+ track->Global2LocalPosition(xyz, track->GetAlpha());
+ points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
+ ip++;
+ }
+ // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
+
+ // Propagate closer to the next update point
+ if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
+
+ if(!AdjustSector(track)) return -1;
+ if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
+
+ //load tracklet to the tracker and the track
+/* Int_t index;
+ if((index = FindTracklet(ptrTracklet)) < 0){
+ ptrTracklet = SetTracklet(&tracklet);
+ index = fTracklets->GetEntriesFast()-1;
+ }
+ track->SetTracklet(ptrTracklet, index);*/
+
+
+ // register tracklet to track with tracklet creation !!
+ // PropagateBack : loaded tracklet to the tracker and update index
+ // RefitInward : update index
+ // MakeTrack : loaded tracklet to the tracker and update index
+ if(!tracklets) track->SetTracklet(ptrTracklet, -1);
+
+
+ //Calculate the mean material budget along the path inside the chamber
+ Double_t xyz0[3]; track->GetXYZ(xyz0);
+ Double_t alpha = track->GetAlpha();
+ Double_t xyz1[3], y, z;
+ if(!track->GetProlongation(x, y, z)) return -1;
+ xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
+ xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
+ xyz1[2] = z;
+ if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position
+ Double_t param[7];
+ if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break;
+ Double_t xrho = param[0]*param[4]; // density*length
+ Double_t xx0 = param[1]; // radiation length
+
+ //Propagate the track
+ track->PropagateTo(x, xx0, xrho);
+ if (!AdjustSector(track)) break;
+
+ //Update track
+ Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
+ Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
+ Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov);
+ if(chi2<1e+10) track->Update(p, cov, chi2);
+ if(!up) continue;
+
+ //Reset material budget if 2 consecutive gold
+ if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
+ } // end planes loop
+
+ // extrapolation
+ while(ip < np){
+ if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
+
+ Double_t xyz[3]; // should also get the covariance
+ track->GetXYZ(xyz);
+ track->Global2LocalPosition(xyz, track->GetAlpha());
+ points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
+ ip++;
+ }
+
+ return track->GetChi2();
}
//_________________________________________________________________________
Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
{
- //
- // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
- // A linear dependence on the x-value serves as a model.
- // The parameters are related to the tilted Riemann fit.
- // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
- // - the offset for the reference x
- // - the slope
- // - the reference x position
- // Output: - The Chi2 value of the track in z-Direction
- //
- Float_t chi2Z = 0, nLayers = 0;
- for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNplan; iLayer++) {
- if(!tracklets[iLayer].IsOK()) continue;
- Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
- chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
- nLayers++;
- }
- chi2Z /= TMath::Max((nLayers - 3.0),1.0);
- return chi2Z;
+ //
+ // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
+ // A linear dependence on the x-value serves as a model.
+ // The parameters are related to the tilted Riemann fit.
+ // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
+ // - the offset for the reference x
+ // - the slope
+ // - the reference x position
+ // Output: - The Chi2 value of the track in z-Direction
+ //
+ Float_t chi2Z = 0, nLayers = 0;
+ for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
+ if(!tracklets[iLayer].IsOK()) continue;
+ Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
+ chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z);
+ nLayers++;
+ }
+ chi2Z /= TMath::Max((nLayers - 3.0),1.0);
+ return chi2Z;
}
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
{
- //
- // Starting from current X-position of track <t> this function
- // extrapolates the track up to radial position <xToGo>.
- // Returns 1 if track reaches the plane, and 0 otherwise
- //
+ //
+ // Starting from current X-position of track <t> this function
+ // extrapolates the track up to radial position <xToGo>.
+ // Returns 1 if track reaches the plane, and 0 otherwise
+ //
- const Double_t kEpsilon = 0.00001;
+ const Double_t kEpsilon = 0.00001;
- // Current track X-position
- Double_t xpos = t.GetX();
+ // Current track X-position
+ Double_t xpos = t.GetX();
- // Direction: inward or outward
- Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
+ // Direction: inward or outward
+ Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
- while (((xToGo - xpos) * dir) > kEpsilon) {
+ while (((xToGo - xpos) * dir) > kEpsilon) {
- Double_t xyz0[3];
- Double_t xyz1[3];
- Double_t param[7];
- Double_t x;
- Double_t y;
- Double_t z;
+ Double_t xyz0[3];
+ Double_t xyz1[3];
+ Double_t param[7];
+ Double_t x;
+ Double_t y;
+ Double_t z;
- // The next step size
- Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
+ // The next step size
+ Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
- // Get the global position of the starting point
- t.GetXYZ(xyz0);
+ // Get the global position of the starting point
+ t.GetXYZ(xyz0);
- // X-position after next step
- x = xpos + step;
+ // X-position after next step
+ x = xpos + step;
- // Get local Y and Z at the X-position of the next step
- if (!t.GetProlongation(x,y,z)) {
- return 0; // No prolongation possible
- }
+ // Get local Y and Z at the X-position of the next step
+ if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible
- // The global position of the end point of this prolongation step
- xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
- xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
- xyz1[2] = z;
+ // The global position of the end point of this prolongation step
+ xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
+ xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
+ xyz1[2] = z;
- // Calculate the mean material budget between start and
- // end point of this prolongation step
- AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
+ // Calculate the mean material budget between start and
+ // end point of this prolongation step
+ if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0;
- // Propagate the track to the X-position after the next step
- if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
- return 0;
- }
+ // Propagate the track to the X-position after the next step
+ if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0;
- // Rotate the track if necessary
- AdjustSector(&t);
+ // Rotate the track if necessary
+ AdjustSector(&t);
- // New track X-position
- xpos = t.GetX();
+ // New track X-position
+ xpos = t.GetX();
- }
+ }
- return 1;
+ return 1;
}
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
{
- //
- // Reads AliTRDclusters from the file.
- // The names of the cluster tree and branches
- // should match the ones used in AliTRDclusterizer::WriteClusters()
- //
-
- Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
- TObjArray *clusterArray = new TObjArray(nsize+1000);
-
- TBranch *branch = clusterTree->GetBranch("TRDcluster");
- if (!branch) {
- AliError("Can't get the branch !");
- return 1;
- }
- branch->SetAddress(&clusterArray);
-
- if(!fClusters){
- array = new TClonesArray("AliTRDcluster", nsize);
- array->SetOwner(kTRUE);
- }
-
- // Loop through all entries in the tree
- Int_t nEntries = (Int_t) clusterTree->GetEntries();
- Int_t nbytes = 0;
- Int_t ncl = 0;
- AliTRDcluster *c = 0x0;
- for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
- // Import the tree
- nbytes += clusterTree->GetEvent(iEntry);
-
- // Get the number of points in the detector
- Int_t nCluster = clusterArray->GetEntriesFast();
- for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
- if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
- c->SetInChamber();
- new((*fClusters)[ncl++]) AliTRDcluster(*c);
- delete (clusterArray->RemoveAt(iCluster));
- }
-
- }
- delete clusterArray;
-
- return 0;
+ //
+ // Reads AliTRDclusters from the file.
+ // The names of the cluster tree and branches
+ // should match the ones used in AliTRDclusterizer::WriteClusters()
+ //
+
+ Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
+ TObjArray *clusterArray = new TObjArray(nsize+1000);
+
+ TBranch *branch = clusterTree->GetBranch("TRDcluster");
+ if (!branch) {
+ AliError("Can't get the branch !");
+ return 1;
+ }
+ branch->SetAddress(&clusterArray);
+
+ if(!fClusters){
+ Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
+ if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
+ array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
+ array->SetOwner(kTRUE);
+ }
+
+ // Loop through all entries in the tree
+ Int_t nEntries = (Int_t) clusterTree->GetEntries();
+ Int_t nbytes = 0;
+ Int_t ncl = 0;
+ AliTRDcluster *c = 0x0;
+ for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
+ // Import the tree
+ nbytes += clusterTree->GetEvent(iEntry);
+
+ // Get the number of points in the detector
+ Int_t nCluster = clusterArray->GetEntriesFast();
+ for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
+ if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
+ new((*fClusters)[ncl++]) AliTRDcluster(*c);
+ delete (clusterArray->RemoveAt(iCluster));
+ }
+
+ }
+ delete clusterArray;
+
+ return 0;
}
//_____________________________________________________________________________
Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
{
- //
- // Fills clusters into TRD tracking_sectors
- // Note that the numbering scheme for the TRD tracking_sectors
- // differs from that of TRD sectors
- //
+ //
+ // Fills clusters into TRD tracking sectors
+ //
+
+ if(!fReconstructor->IsWritingClusters()){
+ fClusters = AliTRDReconstructor::GetClusters();
+ } else {
+ if (ReadClusters(fClusters, cTree)) {
+ AliError("Problem with reading the clusters !");
+ return 1;
+ }
+ }
+ SetClustersOwner();
+
+ if(!fClusters || !fClusters->GetEntriesFast()){
+ AliInfo("No TRD clusters");
+ return 1;
+ }
+
+ //Int_t nin =
+ BuildTrackingContainers();
+
+ //Int_t ncl = fClusters->GetEntriesFast();
+ //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
+
+ return 0;
+}
-
- if (ReadClusters(fClusters, cTree)) {
- AliError("Problem with reading the clusters !");
- return 1;
- }
- Int_t ncl = fClusters->GetEntriesFast(), nin = 0;
- if(!ncl){
- AliInfo("Clusters 0");
- return 1;
- }
+//_____________________________________________________________________________
+Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
+{
+ //
+ // Fills clusters into TRD tracking sectors
+ // Function for use in the HLT
+
+ if(!clusters || !clusters->GetEntriesFast()){
+ AliInfo("No TRD clusters");
+ return 1;
+ }
- Int_t icl = ncl;
- while (icl--) {
- AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
- if(c->IsInChamber()) nin++;
- Int_t detector = c->GetDetector();
- Int_t sector = fGeom->GetSector(detector);
- Int_t stack = fGeom->GetChamber(detector);
- Int_t plane = fGeom->GetPlane(detector);
-
- fTrSec[sector].GetChamber(stack, plane, kTRUE)->InsertCluster(c, icl);
- }
- AliInfo(Form("Clusters %d in %6.2f %%", ncl, 100.*float(nin)/ncl));
-
- for(int isector =0; isector<AliTRDgeometry::kNsect; isector++){
- if(!fTrSec[isector].GetNChambers()) continue;
- fTrSec[isector].Init();
- }
-
- return 0;
+ fClusters = clusters;
+ SetClustersOwner();
+
+ //Int_t nin =
+ BuildTrackingContainers();
+
+ //Int_t ncl = fClusters->GetEntriesFast();
+ //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
+
+ return 0;
}
//____________________________________________________________________
-void AliTRDtrackerV1::UnloadClusters()
-{
- //
- // Clears the arrays of clusters and tracks. Resets sectors and timebins
- //
+Int_t AliTRDtrackerV1::BuildTrackingContainers()
+{
+// Building tracking containers for clusters
+
+ Int_t nin =0, icl = fClusters->GetEntriesFast();
+ while (icl--) {
+ AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
+ if(c->IsInChamber()) nin++;
+ Int_t detector = c->GetDetector();
+ Int_t sector = fGeom->GetSector(detector);
+ Int_t stack = fGeom->GetStack(detector);
+ Int_t layer = fGeom->GetLayer(detector);
+
+ fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
+ }
+
+ const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
+ for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
+ if(!fTrSec[isector].GetNChambers()) continue;
+ fTrSec[isector].Init(fReconstructor, cal);
+ }
+
+ return nin;
+}
- if(fTracks) fTracks->Delete();
- if(fTracklets) fTracklets->Delete();
- if(fClusters) fClusters->Delete();
- for (int i = 0; i < AliTRDgeometry::kNsect; i++) fTrSec[i].Clear();
- // Increment the Event Number
- AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
+//____________________________________________________________________
+void AliTRDtrackerV1::UnloadClusters()
+{
+//
+// Clears the arrays of clusters and tracks. Resets sectors and timebins
+// If option "force" is also set the containers are also deleted. This is useful
+// in case of HLT
+
+ if(fTracks){
+ fTracks->Delete();
+ if(HasRemoveContainers()){delete fTracks; fTracks = 0x0;}
+ }
+ if(fTracklets){
+ fTracklets->Delete();
+ if(HasRemoveContainers()){delete fTracklets; fTracklets = 0x0;}
+ }
+ if(fClusters){
+ if(IsClustersOwner()) fClusters->Delete();
+
+ // save clusters array in the reconstructor for further use.
+ if(!fReconstructor->IsWritingClusters()){
+ AliTRDReconstructor::SetClusters(fClusters);
+ SetClustersOwner(kFALSE);
+ } else AliTRDReconstructor::SetClusters(0x0);
+ }
+
+ for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
+
+ // Increment the Event Number
+ AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
}
+// //____________________________________________________________________
+// void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const
+// {
+// const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t);
+// if(!track) return;
+//
+// AliTRDseedV1 *tracklet = 0x0;
+// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
+// if(!(tracklet = track->GetTracklet(ily))) continue;
+// AliTRDcluster *c = 0x0;
+// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
+// if(!(c=tracklet->GetClusters(ic))) continue;
+// c->Use();
+// }
+// }
+// }
+//
+
//_____________________________________________________________________________
Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
{
- //
- // Rotates the track when necessary
- //
-
- Double_t alpha = AliTRDgeometry::GetAlpha();
- Double_t y = track->GetY();
- Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
-
- if (y > ymax) {
- if (!track->Rotate( alpha)) {
- return kFALSE;
- }
- }
- else if (y < -ymax) {
- if (!track->Rotate(-alpha)) {
- return kFALSE;
- }
- }
-
- return kTRUE;
+ //
+ // Rotates the track when necessary
+ //
+
+ Double_t alpha = AliTRDgeometry::GetAlpha();
+ Double_t y = track->GetY();
+ Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
+
+ if (y > ymax) {
+ if (!track->Rotate( alpha)) {
+ return kFALSE;
+ }
+ }
+ else if (y < -ymax) {
+ if (!track->Rotate(-alpha)) {
+ return kFALSE;
+ }
+ }
+
+ return kTRUE;
}
//____________________________________________________________________
AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
{
- // Find tracklet for TRD track <track>
- // Parameters
- // - track
- // - sector
- // - plane
- // - index
- // Output
- // tracklet
- // index
- // Detailed description
- //
- idx = track->GetTrackletIndex(p);
- AliTRDseedV1 *tracklet = idx<0 ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
-
- return tracklet;
+ // Find tracklet for TRD track <track>
+ // Parameters
+ // - track
+ // - sector
+ // - plane
+ // - index
+ // Output
+ // tracklet
+ // index
+ // Detailed description
+ //
+ idx = track->GetTrackletIndex(p);
+ AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
+
+ return tracklet;
}
//____________________________________________________________________
-Int_t AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
+AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
{
- // Add this tracklet to the list of tracklets stored in the tracker
- //
- // Parameters
- // - tracklet : pointer to the tracklet to be added to the list
- //
- // Output
- // - the index of the new tracklet in the tracker tracklets list
- //
- // Detailed description
- // Build the tracklets list if it is not yet created (late initialization)
- // and adds the new tracklet to the list.
- //
- if(!fTracklets){
- fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsect()*kMaxTracksStack);
- fTracklets->SetOwner(kTRUE);
- }
- Int_t nentries = fTracklets->GetEntriesFast();
- new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
- return nentries;
+ // Add this tracklet to the list of tracklets stored in the tracker
+ //
+ // Parameters
+ // - tracklet : pointer to the tracklet to be added to the list
+ //
+ // Output
+ // - the index of the new tracklet in the tracker tracklets list
+ //
+ // Detailed description
+ // Build the tracklets list if it is not yet created (late initialization)
+ // and adds the new tracklet to the list.
+ //
+ if(!fTracklets){
+ fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
+ fTracklets->SetOwner(kTRUE);
+ }
+ Int_t nentries = fTracklets->GetEntriesFast();
+ return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
}
//____________________________________________________________________
-Bool_t AliTRDtrackerV1::UpdateTracklet(AliTRDseedV1 *tracklet, Int_t index){
- //
- // Update Tracklet in the tracklet container
- //
- // Parameters:
- // - the tracklet information
- // - the index of the tracklet which has to be updated
- //
- // Output:
- // - True if successfull
- // - false if the container doesn't exist or the index is out of range
- //
- if(!fTracklets || index >= fTracklets->GetEntriesFast()) return kFALSE;
-
- new((*fTracklets)[index]) AliTRDseedV1(*tracklet);
- return kTRUE;
+AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
+{
+ // Add this track to the list of tracks stored in the tracker
+ //
+ // Parameters
+ // - track : pointer to the track to be added to the list
+ //
+ // Output
+ // - the pointer added
+ //
+ // Detailed description
+ // Build the tracks list if it is not yet created (late initialization)
+ // and adds the new track to the list.
+ //
+ if(!fTracks){
+ fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
+ fTracks->SetOwner(kTRUE);
+ }
+ Int_t nentries = fTracks->GetEntriesFast();
+ return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
}
+
+
//____________________________________________________________________
Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
{
- //
- // Steer tracking for one SM.
- //
- // Parameters :
- // sector : Array of (SM) propagation layers containing clusters
- // esd : The current ESD event. On output it contains the also
- // the ESD (TRD) tracks found in this SM.
- //
- // Output :
- // Number of tracks found in this TRD supermodule.
- //
- // Detailed description
- //
- // 1. Unpack AliTRDpropagationLayers objects for each stack.
- // 2. Launch stack tracking.
- // See AliTRDtrackerV1::Clusters2TracksStack() for details.
- // 3. Pack results in the ESD event.
- //
-
- // allocate space for esd tracks in this SM
- TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
- esdTrackList.SetOwner();
-
- Int_t nTracks = 0;
- Int_t nChambers = 0;
- AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
- for(int istack = 0; istack<AliTRDgeometry::kNcham; istack++){
- if(!(stack = fTrSec[sector].GetStack(istack))) continue;
- nChambers = 0;
- for(int iplane=0; iplane<AliTRDgeometry::kNplan; iplane++){
- if(!(chamber = stack[iplane])) continue;
- if(chamber->GetNClusters() < fgNTimeBins * AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue;
- nChambers++;
- //AliInfo(Form("sector %d stack %d plane %d clusters %d", sector, istack, iplane, chamber->GetNClusters()));
- }
- if(nChambers < 4) continue;
- //AliInfo(Form("Doing stack %d", istack));
- nTracks += Clusters2TracksStack(stack, &esdTrackList);
- }
- //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
-
- for(int itrack=0; itrack<nTracks; itrack++)
- esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
-
- // Reset Track and Candidate Number
- AliTRDtrackerDebug::SetCandidateNumber(0);
- AliTRDtrackerDebug::SetTrackNumber(0);
- return nTracks;
+ //
+ // Steer tracking for one SM.
+ //
+ // Parameters :
+ // sector : Array of (SM) propagation layers containing clusters
+ // esd : The current ESD event. On output it contains the also
+ // the ESD (TRD) tracks found in this SM.
+ //
+ // Output :
+ // Number of tracks found in this TRD supermodule.
+ //
+ // Detailed description
+ //
+ // 1. Unpack AliTRDpropagationLayers objects for each stack.
+ // 2. Launch stack tracking.
+ // See AliTRDtrackerV1::Clusters2TracksStack() for details.
+ // 3. Pack results in the ESD event.
+ //
+
+ // allocate space for esd tracks in this SM
+ TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
+ esdTrackList.SetOwner();
+
+ Int_t nTracks = 0;
+ Int_t nChambers = 0;
+ AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
+ for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
+ if(!(stack = fTrSec[sector].GetStack(istack))) continue;
+ nChambers = 0;
+ for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
+ if(!(chamber = stack[ilayer])) continue;
+ if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
+ nChambers++;
+ //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
+ }
+ if(nChambers < 4) continue;
+ //AliInfo(Form("Doing stack %d", istack));
+ nTracks += Clusters2TracksStack(stack, &esdTrackList);
+ }
+ //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
+
+ for(int itrack=0; itrack<nTracks; itrack++)
+ esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
+
+ // Reset Track and Candidate Number
+ AliTRDtrackerDebug::SetCandidateNumber(0);
+ AliTRDtrackerDebug::SetTrackNumber(0);
+ return nTracks;
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
{
- //
- // Make tracks in one TRD stack.
- //
- // Parameters :
- // layer : Array of stack propagation layers containing clusters
- // esdTrackList : Array of ESD tracks found by the stand alone tracker.
- // On exit the tracks found in this stack are appended.
- //
- // Output :
- // Number of tracks found in this stack.
- //
- // Detailed description
- //
- // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
- // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
- // See AliTRDtrackerV1::MakeSeeds() for more details.
- // 3. Arrange track candidates in decreasing order of their quality
- // 4. Classify tracks in 5 categories according to:
- // a) number of layers crossed
- // b) track quality
- // 5. Sign clusters by tracks in decreasing order of track quality
- // 6. Build AliTRDtrack out of seeding tracklets
- // 7. Cook MC label
- // 8. Build ESD track and register it to the output list
- //
-
- AliTRDtrackingChamber *chamber = 0x0;
- AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
- Int_t pars[4]; // MakeSeeds parameters
-
- //Double_t alpha = AliTRDgeometry::GetAlpha();
- //Double_t shift = .5 * alpha;
- Int_t configs[kNConfigs];
-
- // Build initial seeding configurations
- Double_t quality = BuildSeedingConfigs(stack, configs);
- if(AliTRDReconstructor::StreamLevel() > 1){
- AliInfo(Form("Plane config %d %d %d Quality %f"
- , configs[0], configs[1], configs[2], quality));
- }
-
- // Initialize contors
- Int_t ntracks, // number of TRD track candidates
- ntracks1, // number of registered TRD tracks/iter
- ntracks2 = 0; // number of all registered TRD tracks in stack
- fSieveSeeding = 0;
- do{
- // Loop over seeding configurations
- ntracks = 0; ntracks1 = 0;
- for (Int_t iconf = 0; iconf<3; iconf++) {
- pars[0] = configs[iconf];
- pars[1] = ntracks;
- ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
- if(ntracks == kMaxTracksStack) break;
- }
- if(AliTRDReconstructor::StreamLevel() > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
-
- if(!ntracks) break;
-
- // Sort the seeds according to their quality
- Int_t sort[kMaxTracksStack];
- TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
-
- // Initialize number of tracks so far and logic switches
- Int_t ntracks0 = esdTrackList->GetEntriesFast();
- Bool_t signedTrack[kMaxTracksStack];
- Bool_t fakeTrack[kMaxTracksStack];
- for (Int_t i=0; i<ntracks; i++){
- signedTrack[i] = kFALSE;
- fakeTrack[i] = kFALSE;
- }
- //AliInfo("Selecting track candidates ...");
-
- // Sieve clusters in decreasing order of track quality
- Double_t trackParams[7];
- // AliTRDseedV1 *lseed = 0x0;
- Int_t jSieve = 0, candidates;
- do{
- //AliInfo(Form("\t\tITER = %i ", jSieve));
-
- // Check track candidates
- candidates = 0;
- for (Int_t itrack = 0; itrack < ntracks; itrack++) {
- Int_t trackIndex = sort[itrack];
- if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
-
-
- // Calculate track parameters from tracklets seeds
- Int_t labelsall[1000];
- Int_t nlabelsall = 0;
- Int_t naccepted = 0;
- Int_t ncl = 0;
- Int_t nused = 0;
- Int_t nlayers = 0;
- Int_t findable = 0;
- for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
- Int_t jseed = kNPlanes*trackIndex+jLayer;
- if(!sseed[jseed].IsOK()) continue;
- if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
-
- sseed[jseed].UpdateUsed();
- ncl += sseed[jseed].GetN2();
- nused += sseed[jseed].GetNUsed();
- nlayers++;
-
- // Cooking label
- for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
- if(!sseed[jseed].IsUsable(itime)) continue;
- naccepted++;
- Int_t tindex = 0, ilab = 0;
- while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
- labelsall[nlabelsall++] = tindex;
- ilab++;
- }
- }
- }
- // Filter duplicated tracks
- if (nused > 30){
- //printf("Skip %d nused %d\n", trackIndex, nused);
- fakeTrack[trackIndex] = kTRUE;
- continue;
- }
- if (Float_t(nused)/ncl >= .25){
- //printf("Skip %d nused/ncl >= .25\n", trackIndex);
- fakeTrack[trackIndex] = kTRUE;
- continue;
- }
-
- // Classify tracks
- Bool_t skip = kFALSE;
- switch(jSieve){
- case 0:
- if(nlayers < 6) {skip = kTRUE; break;}
- if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
- break;
-
- case 1:
- if(nlayers < findable){skip = kTRUE; break;}
- if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
- break;
-
- case 2:
- if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
- if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
- break;
-
- case 3:
- if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
- break;
-
- case 4:
- if (nlayers == 3){skip = kTRUE; break;}
- //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
- break;
- }
- if(skip){
- candidates++;
- //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
- continue;
- }
- signedTrack[trackIndex] = kTRUE;
-
-
- // Build track label - what happens if measured data ???
- Int_t labels[1000];
- Int_t outlab[1000];
- Int_t nlab = 0;
- for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
- Int_t jseed = kNPlanes*trackIndex+iLayer;
- if(!sseed[jseed].IsOK()) continue;
- for(int ilab=0; ilab<2; ilab++){
- if(sseed[jseed].GetLabels(ilab) < 0) continue;
- labels[nlab] = sseed[jseed].GetLabels(ilab);
- nlab++;
- }
- }
- Freq(nlab,labels,outlab,kFALSE);
- Int_t label = outlab[0];
- Int_t frequency = outlab[1];
- Freq(nlabelsall,labelsall,outlab,kFALSE);
- Int_t label1 = outlab[0];
- Int_t label2 = outlab[2];
- Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
-
-
- // Sign clusters
- AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
- for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
- Int_t jseed = kNPlanes*trackIndex+jLayer;
- if(!sseed[jseed].IsOK()) continue;
- if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
- sseed[jseed].UseClusters();
- if(!cl){
- Int_t ic = 0;
- while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
- clusterIndex = sseed[jseed].GetIndexes(ic);
- }
- }
- if(!cl) continue;
-
-
- // Build track parameters
- AliTRDseedV1 *lseed =&sseed[trackIndex*6];
- Int_t idx = 0;
- while(idx<3 && !lseed->IsOK()) {
- idx++;
- lseed++;
- }
- Double_t cR = lseed->GetC();
- trackParams[1] = lseed->GetYref(0);
- trackParams[2] = lseed->GetZref(0);
- trackParams[3] = lseed->GetX0() * cR - TMath::Sin(TMath::ATan(lseed->GetYref(1)));
- trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
- trackParams[5] = cR;
- trackParams[0] = lseed->GetX0();
- Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
- trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
-
- if(AliTRDReconstructor::StreamLevel() > 1){
- AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
-
- Int_t nclusters = 0;
- AliTRDseedV1 *dseed[6];
- for(int is=0; is<6; is++){
- dseed[is] = new AliTRDseedV1(sseed[trackIndex*6+is]);
- dseed[is]->SetOwner();
- nclusters += sseed[is].GetN2();
- }
- //Int_t eventNrInFile = esd->GetEventNumberInFile();
- //AliInfo(Form("Number of clusters %d.", nclusters));
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- cstreamer << "Clusters2TracksStack"
- << "EventNumber=" << eventNumber
- << "TrackNumber=" << trackNumber
- << "CandidateNumber=" << candidateNumber
- << "Iter=" << fSieveSeeding
- << "Like=" << fTrackQuality[trackIndex]
- << "S0.=" << dseed[0]
- << "S1.=" << dseed[1]
- << "S2.=" << dseed[2]
- << "S3.=" << dseed[3]
- << "S4.=" << dseed[4]
- << "S5.=" << dseed[5]
- << "p0=" << trackParams[0]
- << "p1=" << trackParams[1]
- << "p2=" << trackParams[2]
- << "p3=" << trackParams[3]
- << "p4=" << trackParams[4]
- << "p5=" << trackParams[5]
- << "p6=" << trackParams[6]
- << "Label=" << label
- << "Label1=" << label1
- << "Label2=" << label2
- << "FakeRatio=" << fakeratio
- << "Freq=" << frequency
- << "Ncl=" << ncl
- << "NLayers=" << nlayers
- << "Findable=" << findable
-
- << "NUsed=" << nused
- << "\n";
- }
-
- AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
- if(!track){
- //AliWarning("Fail to build a TRD Track.");
- continue;
- }
- //AliInfo("End of MakeTrack()");
- AliESDtrack esdTrack;
- esdTrack.UpdateTrackParams(track, AliESDtrack::kTRDout);
- esdTrack.SetLabel(track->GetLabel());
- track->UpdateESDtrack(&esdTrack);
- // write ESD-friends if neccessary
- if (AliTRDReconstructor::StreamLevel() > 0){
- //printf("Creating Calibrations Object\n");
- AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
- calibTrack->SetOwner();
- esdTrack.AddCalibObject(calibTrack);
- }
- new ((*esdTrackList)[ntracks0++]) AliESDtrack(esdTrack);
- ntracks1++;
- AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
- }
-
- jSieve++;
- } while(jSieve<5 && candidates); // end track candidates sieve
- if(!ntracks1) break;
-
- // increment counters
- ntracks2 += ntracks1;
- fSieveSeeding++;
-
- // Rebuild plane configurations and indices taking only unused clusters into account
- quality = BuildSeedingConfigs(stack, configs);
- if(quality < 1.E-7) break; //AliTRDReconstructor::RecoParam()->GetPlaneQualityThreshold()) break;
-
- for(Int_t ip = 0; ip < kNPlanes; ip++){
- if(!(chamber = stack[ip])) continue;
- chamber->Build(fGeom);//Indices(fSieveSeeding);
- }
-
- if(AliTRDReconstructor::StreamLevel() > 1){
- AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
- }
- } while(fSieveSeeding<10); // end stack clusters sieve
-
-
-
- //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
-
- return ntracks2;
+ //
+ // Make tracks in one TRD stack.
+ //
+ // Parameters :
+ // layer : Array of stack propagation layers containing clusters
+ // esdTrackList : Array of ESD tracks found by the stand alone tracker.
+ // On exit the tracks found in this stack are appended.
+ //
+ // Output :
+ // Number of tracks found in this stack.
+ //
+ // Detailed description
+ //
+ // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
+ // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
+ // See AliTRDtrackerV1::MakeSeeds() for more details.
+ // 3. Arrange track candidates in decreasing order of their quality
+ // 4. Classify tracks in 5 categories according to:
+ // a) number of layers crossed
+ // b) track quality
+ // 5. Sign clusters by tracks in decreasing order of track quality
+ // 6. Build AliTRDtrack out of seeding tracklets
+ // 7. Cook MC label
+ // 8. Build ESD track and register it to the output list
+ //
+
+ const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
+ AliTRDtrackingChamber *chamber = 0x0;
+ AliTRDtrackingChamber **ci = 0x0;
+ AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
+ Int_t pars[4]; // MakeSeeds parameters
+
+ //Double_t alpha = AliTRDgeometry::GetAlpha();
+ //Double_t shift = .5 * alpha;
+ Int_t configs[kNConfigs];
+
+ // Purge used clusters from the containers
+ ci = &stack[0];
+ for(Int_t ic = kNPlanes; ic--; ci++){
+ if(!(*ci)) continue;
+ (*ci)->Update();
+ }
+
+ // Build initial seeding configurations
+ Double_t quality = BuildSeedingConfigs(stack, configs);
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
+ AliInfo(Form("Plane config %d %d %d Quality %f"
+ , configs[0], configs[1], configs[2], quality));
+ }
+
+
+ // Initialize contors
+ Int_t ntracks, // number of TRD track candidates
+ ntracks1, // number of registered TRD tracks/iter
+ ntracks2 = 0; // number of all registered TRD tracks in stack
+ fSieveSeeding = 0;
+
+ // Get stack index
+ Int_t ic = 0; ci = &stack[0];
+ while(ic<kNPlanes && !(*ci)){ic++; ci++;}
+ if(!(*ci)) return ntracks2;
+ Int_t istack = fGeom->GetStack((*ci)->GetDetector());
+
+ do{
+ // Loop over seeding configurations
+ ntracks = 0; ntracks1 = 0;
+ for (Int_t iconf = 0; iconf<3; iconf++) {
+ pars[0] = configs[iconf];
+ pars[1] = ntracks;
+ pars[2] = istack;
+ ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
+ //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks));
+ if(ntracks == kMaxTracksStack) break;
+ }
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
+
+ if(!ntracks) break;
+
+ // Sort the seeds according to their quality
+ Int_t sort[kMaxTracksStack];
+ TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
+
+ // Initialize number of tracks so far and logic switches
+ Int_t ntracks0 = esdTrackList->GetEntriesFast();
+ Bool_t signedTrack[kMaxTracksStack];
+ Bool_t fakeTrack[kMaxTracksStack];
+ for (Int_t i=0; i<ntracks; i++){
+ signedTrack[i] = kFALSE;
+ fakeTrack[i] = kFALSE;
+ }
+ //AliInfo("Selecting track candidates ...");
+
+ // Sieve clusters in decreasing order of track quality
+ Double_t trackParams[7];
+ // AliTRDseedV1 *lseed = 0x0;
+ Int_t jSieve = 0, candidates;
+ do{
+ //AliInfo(Form("\t\tITER = %i ", jSieve));
+
+ // Check track candidates
+ candidates = 0;
+ for (Int_t itrack = 0; itrack < ntracks; itrack++) {
+ Int_t trackIndex = sort[itrack];
+ if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
+
+
+ // Calculate track parameters from tracklets seeds
+ Int_t ncl = 0;
+ Int_t nused = 0;
+ Int_t nlayers = 0;
+ Int_t findable = 0;
+ for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
+ Int_t jseed = kNPlanes*trackIndex+jLayer;
+ if(!sseed[jseed].IsOK()) continue;
+ if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
+ // TODO here we get a sig fault which should never happen !
+ sseed[jseed].UpdateUsed();
+ ncl += sseed[jseed].GetN2();
+ nused += sseed[jseed].GetNUsed();
+ nlayers++;
+ }
+
+ // Filter duplicated tracks
+ if (nused > 30){
+ //printf("Skip %d nused %d\n", trackIndex, nused);
+ fakeTrack[trackIndex] = kTRUE;
+ continue;
+ }
+ if (Float_t(nused)/ncl >= .25){
+ //printf("Skip %d nused/ncl >= .25\n", trackIndex);
+ fakeTrack[trackIndex] = kTRUE;
+ continue;
+ }
+
+ // Classify tracks
+ Bool_t skip = kFALSE;
+ switch(jSieve){
+ case 0:
+ if(nlayers < 6) {skip = kTRUE; break;}
+ if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
+ break;
+
+ case 1:
+ if(nlayers < findable){skip = kTRUE; break;}
+ if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
+ break;
+
+ case 2:
+ if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
+ if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
+ break;
+
+ case 3:
+ if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
+ break;
+
+ case 4:
+ if (nlayers == 3){skip = kTRUE; break;}
+ //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
+ break;
+ }
+ if(skip){
+ candidates++;
+ //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
+ continue;
+ }
+ signedTrack[trackIndex] = kTRUE;
+
+ // Build track parameters
+ AliTRDseedV1 *lseed =&sseed[trackIndex*6];
+ /* Int_t idx = 0;
+ while(idx<3 && !lseed->IsOK()) {
+ idx++;
+ lseed++;
+ }*/
+ Double_t x = lseed->GetX0();// - 3.5;
+ trackParams[0] = x; //NEW AB
+ trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
+ trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
+ trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
+ trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
+ trackParams[5] = lseed->GetC();
+ Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
+ trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
+
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
+ //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
+
+ AliTRDseedV1 *dseed[6];
+ for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]);
+
+ //Int_t eventNrInFile = esd->GetEventNumberInFile();
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ cstreamer << "Clusters2TracksStack"
+ << "EventNumber=" << eventNumber
+ << "TrackNumber=" << trackNumber
+ << "CandidateNumber=" << candidateNumber
+ << "Iter=" << fSieveSeeding
+ << "Like=" << fTrackQuality[trackIndex]
+ << "S0.=" << dseed[0]
+ << "S1.=" << dseed[1]
+ << "S2.=" << dseed[2]
+ << "S3.=" << dseed[3]
+ << "S4.=" << dseed[4]
+ << "S5.=" << dseed[5]
+ << "p0=" << trackParams[0]
+ << "p1=" << trackParams[1]
+ << "p2=" << trackParams[2]
+ << "p3=" << trackParams[3]
+ << "p4=" << trackParams[4]
+ << "p5=" << trackParams[5]
+ << "p6=" << trackParams[6]
+ << "Ncl=" << ncl
+ << "NLayers=" << nlayers
+ << "Findable=" << findable
+ << "NUsed=" << nused
+ << "\n";
+ }
+
+ AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
+ if(!track){
+ AliWarning("Fail to build a TRD Track.");
+ continue;
+ }
+
+ //AliInfo("End of MakeTrack()");
+ AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
+ esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
+ esdTrack->SetLabel(track->GetLabel());
+ track->UpdateESDtrack(esdTrack);
+ // write ESD-friends if neccessary
+ if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
+ AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
+ calibTrack->SetOwner();
+ esdTrack->AddCalibObject(calibTrack);
+ }
+ ntracks1++;
+ AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
+ }
+
+ jSieve++;
+ } while(jSieve<5 && candidates); // end track candidates sieve
+ if(!ntracks1) break;
+
+ // increment counters
+ ntracks2 += ntracks1;
+
+ if(fReconstructor->IsHLT()) break;
+ fSieveSeeding++;
+
+ // Rebuild plane configurations and indices taking only unused clusters into account
+ quality = BuildSeedingConfigs(stack, configs);
+ if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
+
+ for(Int_t ip = 0; ip < kNPlanes; ip++){
+ if(!(chamber = stack[ip])) continue;
+ chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
+ }
+
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){
+ AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
+ }
+ } while(fSieveSeeding<10); // end stack clusters sieve
+
+
+
+ //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
+
+ return ntracks2;
}
//___________________________________________________________________
Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
{
- //
- // Assign probabilities to chambers according to their
- // capability of producing seeds.
- //
- // Parameters :
- //
- // layers : Array of stack propagation layers for all 6 chambers in one stack
- // configs : On exit array of configuration indexes (see GetSeedingConfig()
- // for details) in the decreasing order of their seeding probabilities.
- //
- // Output :
- //
- // Return top configuration quality
- //
- // Detailed description:
- //
- // To each chamber seeding configuration (see GetSeedingConfig() for
- // the list of all configurations) one defines 2 quality factors:
- // - an apriori topological quality (see GetSeedingConfig() for details) and
- // - a data quality based on the uniformity of the distribution of
- // clusters over the x range (time bins population). See CookChamberQA() for details.
- // The overall chamber quality is given by the product of this 2 contributions.
- //
-
- Double_t chamberQ[kNPlanes];
- AliTRDtrackingChamber *chamber = 0x0;
- for(int iplane=0; iplane<kNPlanes; iplane++){
- if(!(chamber = stack[iplane])) continue;
- chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
- }
-
- Double_t tconfig[kNConfigs];
- Int_t planes[4];
- for(int iconf=0; iconf<kNConfigs; iconf++){
- GetSeedingConfig(iconf, planes);
- tconfig[iconf] = fgTopologicQA[iconf];
- for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
- }
-
- TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
- // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
- // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
- // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
-
- return tconfig[configs[0]];
+ //
+ // Assign probabilities to chambers according to their
+ // capability of producing seeds.
+ //
+ // Parameters :
+ //
+ // layers : Array of stack propagation layers for all 6 chambers in one stack
+ // configs : On exit array of configuration indexes (see GetSeedingConfig()
+ // for details) in the decreasing order of their seeding probabilities.
+ //
+ // Output :
+ //
+ // Return top configuration quality
+ //
+ // Detailed description:
+ //
+ // To each chamber seeding configuration (see GetSeedingConfig() for
+ // the list of all configurations) one defines 2 quality factors:
+ // - an apriori topological quality (see GetSeedingConfig() for details) and
+ // - a data quality based on the uniformity of the distribution of
+ // clusters over the x range (time bins population). See CookChamberQA() for details.
+ // The overall chamber quality is given by the product of this 2 contributions.
+ //
+
+ Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
+ AliTRDtrackingChamber *chamber = 0x0;
+ for(int iplane=0; iplane<kNPlanes; iplane++){
+ if(!(chamber = stack[iplane])) continue;
+ chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
+ }
+
+ Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t));
+ Int_t planes[] = {0, 0, 0, 0};
+ for(int iconf=0; iconf<kNConfigs; iconf++){
+ GetSeedingConfig(iconf, planes);
+ tconfig[iconf] = fgTopologicQA[iconf];
+ for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
+ }
+
+ TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
+ // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
+ // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
+ // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
+
+ return tconfig[configs[0]];
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
{
- //
- // Make tracklet seeds in the TRD stack.
- //
- // Parameters :
- // layers : Array of stack propagation layers containing clusters
- // sseed : Array of empty tracklet seeds. On exit they are filled.
- // ipar : Control parameters:
- // ipar[0] -> seeding chambers configuration
- // ipar[1] -> stack index
- // ipar[2] -> number of track candidates found so far
- //
- // Output :
- // Number of tracks candidates found.
- //
- // Detailed description
- //
- // The following steps are performed:
- // 1. Select seeding layers from seeding chambers
- // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
- // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
- // this order. The parameters controling the range of accepted clusters in
- // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
- // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
- // 4. Initialize seeding tracklets in the seeding chambers.
- // 5. Filter 0.
- // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
- // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
- // 6. Attach clusters to seeding tracklets and find linear approximation of
- // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
- // clusters used by current seeds should not exceed ... (25).
- // 7. Filter 1.
- // All 4 seeding tracklets should be correctly constructed (see
- // AliTRDseedV1::AttachClustersIter())
- // 8. Helix fit of the seeding tracklets
- // 9. Filter 2.
- // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
- // 10. Extrapolation of the helix fit to the other 2 chambers:
- // a) Initialization of extrapolation tracklet with fit parameters
- // b) Helix fit of tracklets
- // c) Attach clusters and linear interpolation to extrapolated tracklets
- // d) Helix fit of tracklets
- // 11. Improve seeding tracklets quality by reassigning clusters.
- // See AliTRDtrackerV1::ImproveSeedQuality() for details.
- // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
- // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
- // 14. Cooking labels for tracklets. Should be done only for MC
- // 15. Register seeds.
- //
-
- AliTRDtrackingChamber *chamber = 0x0;
- AliTRDcluster *c[4] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
- AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
- Int_t ncl, mcl; // working variable for looping over clusters
- Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
- // chi2 storage
- // chi2[0] = tracklet chi2 on the Z direction
- // chi2[1] = tracklet chi2 on the R direction
- Double_t chi2[4];
-
-
- // this should be data member of AliTRDtrack
- Double_t seedQuality[kMaxTracksStack];
-
- // unpack control parameters
- Int_t config = ipar[0];
- Int_t ntracks = ipar[1];
- Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
-
- // Init chambers geometry
- Int_t ic = 0; while(!(chamber = stack[ic])) ic++;
- Int_t istack = fGeom->GetChamber(chamber->GetDetector());
- Double_t hL[kNPlanes]; // Tilting angle
- Float_t padlength[kNPlanes]; // pad lenghts
- AliTRDpadPlane *pp = 0x0;
- for(int iplane=0; iplane<kNPlanes; iplane++){
- pp = fGeom->GetPadPlane(iplane, istack);
- hL[iplane] = TMath::Tan(-TMath::DegToRad()*pp->GetTiltingAngle());
- padlength[iplane] = pp->GetLengthIPad();
- }
-
- if(AliTRDReconstructor::StreamLevel() > 1){
- AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
- }
-
- Int_t nlayers = 0;
- AliTRDchamberTimeBin *layer[] = {0x0, 0x0, 0x0, 0x0};
- for(int isl=0; isl<kNSeedPlanes; isl++){
- if(!(chamber = stack[planes[isl]])) continue;
- if(!(layer[isl] = chamber->GetSeedingLayer(fGeom))) continue;
- nlayers++;
- //AliInfo(Form("seeding plane %d clusters %d", planes[isl], Int_t(*layer[isl])));
- }
- if(nlayers < 4) return 0;
-
-
- // Start finding seeds
- Double_t cond0[4], cond1[4], cond2[4];
- Int_t icl = 0;
- while((c[3] = (*layer[3])[icl++])){
- if(!c[3]) continue;
- layer[0]->BuildCond(c[3], cond0, 0);
- layer[0]->GetClusters(cond0, index, ncl);
- //printf("Found c[3] candidates 0 %d\n", ncl);
- Int_t jcl = 0;
- while(jcl<ncl) {
- c[0] = (*layer[0])[index[jcl++]];
- if(!c[0]) continue;
- Double_t dx = c[3]->GetX() - c[0]->GetX();
- Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
- Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
- layer[1]->BuildCond(c[0], cond1, 1, theta, phi);
- layer[1]->GetClusters(cond1, jndex, mcl);
- //printf("Found c[0] candidates 1 %d\n", mcl);
-
- Int_t kcl = 0;
- while(kcl<mcl) {
- c[1] = (*layer[1])[jndex[kcl++]];
- if(!c[1]) continue;
- layer[2]->BuildCond(c[1], cond2, 2, theta, phi);
- c[2] = layer[2]->GetNearestCluster(cond2);
- //printf("Found c[1] candidate 2 %p\n", c[2]);
- if(!c[2]) continue;
-
- // AliInfo("Seeding clusters found. Building seeds ...");
- // for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ());
-
- for (Int_t il = 0; il < 6; il++) cseed[il].Reset();
-
- FitRieman(c, chi2);
-
- AliTRDseedV1 *tseed = 0x0;
- for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
- Int_t jLayer = planes[iLayer];
- tseed = &cseed[jLayer];
- tseed->SetPlane(jLayer);
- tseed->SetTilt(hL[jLayer]);
- tseed->SetPadLength(padlength[jLayer]);
- tseed->SetX0(stack[jLayer]->GetX());
- tseed->Init(GetRiemanFitter());
- }
-
- Bool_t isFake = kFALSE;
- if(AliTRDReconstructor::StreamLevel() >= 2){
- if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
- if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
- if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
-
- Double_t xpos[4];
- for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = layer[l]->GetX();
- Float_t yref[4];
- for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
- Int_t ll = c[3]->GetLabel(0);
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- AliRieman *rim = GetRiemanFitter();
- TTreeSRedirector &cs0 = *fgDebugStreamer;
- cs0 << "MakeSeeds0"
- <<"EventNumber=" << eventNumber
- <<"CandidateNumber=" << candidateNumber
- <<"isFake=" << isFake
- <<"config=" << config
- <<"label=" << ll
- <<"chi2z=" << chi2[0]
- <<"chi2y=" << chi2[1]
- <<"Y2exp=" << cond2[0]
- <<"Z2exp=" << cond2[1]
- <<"X0=" << xpos[0] //layer[sLayer]->GetX()
- <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
- <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
- <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
- <<"yref0=" << yref[0]
- <<"yref1=" << yref[1]
- <<"yref2=" << yref[2]
- <<"yref3=" << yref[3]
- <<"c0.=" << c[0]
- <<"c1.=" << c[1]
- <<"c2.=" << c[2]
- <<"c3.=" << c[3]
- <<"Seed0.=" << &cseed[planes[0]]
- <<"Seed1.=" << &cseed[planes[1]]
- <<"Seed2.=" << &cseed[planes[2]]
- <<"Seed3.=" << &cseed[planes[3]]
- <<"RiemanFitter.=" << rim
- <<"\n";
- }
-
- if(chi2[0] > AliTRDReconstructor::RecoParam()->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
- //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- if(chi2[1] > AliTRDReconstructor::RecoParam()->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
- //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- //AliInfo("Passed chi2 filter.");
-
- // try attaching clusters to tracklets
- Int_t nUsedCl = 0;
- Int_t nlayers = 0;
- for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
- Int_t jLayer = planes[iLayer];
- if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
- nUsedCl += cseed[jLayer].GetNUsed();
- if(nUsedCl > 25) break;
- nlayers++;
- }
- if(nlayers < kNSeedPlanes){
- //AliInfo(Form("Failed updating all seeds %d [%d].", nlayers, kNSeedPlanes));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- // fit tracklets and cook likelihood
- FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
- chi2[0] = GetChi2Y(&cseed[0]);
- chi2[1] = GetChi2Z(&cseed[0]);
- //Chi2 definitions in testing stage
- //chi2[0] = GetChi2YTest(&cseed[0]);
- //chi2[1] = GetChi2ZTest(&cseed[0]);
- Double_t like = CookLikelihood(&cseed[0], planes, chi2); // to be checked
-
- if (TMath::Log(1.E-9 + like) < AliTRDReconstructor::RecoParam()->GetTrackLikelihood()){
- //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
-
- // book preliminary results
- seedQuality[ntracks] = like;
- fSeedLayer[ntracks] = config;/*sLayer;*/
-
- // attach clusters to the extrapolation seeds
- Int_t lextrap[2];
- GetExtrapolationConfig(config, lextrap);
- Int_t nusedf = 0; // debug value
- for(int iLayer=0; iLayer<2; iLayer++){
- Int_t jLayer = lextrap[iLayer];
- if(!(chamber = stack[jLayer])) continue;
-
- // prepare extrapolated seed
- cseed[jLayer].Reset();
- cseed[jLayer].SetPlane(jLayer);
- cseed[jLayer].SetTilt(hL[jLayer]);
- cseed[jLayer].SetX0(chamber->GetX());
- cseed[jLayer].SetPadLength(padlength[jLayer]);
-
- // fit extrapolated seed
- if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
- if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
- AliTRDseedV1 tseed = cseed[jLayer];
- if(!tseed.AttachClustersIter(chamber, 1000.)) continue;
- cseed[jLayer] = tseed;
- nusedf += cseed[jLayer].GetNUsed(); // debug value
- FitTiltedRieman(cseed, kTRUE);
- }
-
- // AliInfo("Extrapolation done.");
- // Debug Stream containing all the 6 tracklets
- if(AliTRDReconstructor::StreamLevel() >= 2){
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- cstreamer << "MakeSeeds1"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "S0.=" << &cseed[0]
- << "S1.=" << &cseed[1]
- << "S2.=" << &cseed[2]
- << "S3.=" << &cseed[3]
- << "S4.=" << &cseed[4]
- << "S5.=" << &cseed[5]
- << "FitterT.=" << tiltedRieman
- << "\n";
- }
-
- if(ImproveSeedQuality(stack, cseed) < 4){
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- //AliInfo("Improve seed quality done.");
-
- // fit full track and cook likelihoods
- // Double_t curv = FitRieman(&cseed[0], chi2);
- // Double_t chi2ZF = chi2[0] / TMath::Max((nlayers - 3.), 1.);
- // Double_t chi2RF = chi2[1] / TMath::Max((nlayers - 3.), 1.);
-
- // do the final track fitting (Once with vertex constraint and once without vertex constraint)
- Double_t chi2Vals[3];
- chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
- chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
- chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((nlayers - 3.), 1.);
- // Chi2 definitions in testing stage
- //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
- fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
- //AliInfo("Hyperplane fit done\n");
-
- // finalize tracklets
- Int_t labels[12];
- Int_t outlab[24];
- Int_t nlab = 0;
- for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
- if (!cseed[iLayer].IsOK()) continue;
-
- if (cseed[iLayer].GetLabels(0) >= 0) {
- labels[nlab] = cseed[iLayer].GetLabels(0);
- nlab++;
- }
-
- if (cseed[iLayer].GetLabels(1) >= 0) {
- labels[nlab] = cseed[iLayer].GetLabels(1);
- nlab++;
- }
- }
- Freq(nlab,labels,outlab,kFALSE);
- Int_t label = outlab[0];
- Int_t frequency = outlab[1];
- for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
- cseed[iLayer].SetFreq(frequency);
- cseed[iLayer].SetChi2Z(chi2[1]);
- }
-
- if(AliTRDReconstructor::StreamLevel() >= 2){
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
- TLinearFitter *fitterT = GetTiltedRiemanFitter();
- cstreamer << "MakeSeeds2"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "Chi2TR=" << chi2Vals[0]
- << "Chi2TC=" << chi2Vals[1]
- << "Nlayers=" << nlayers
- << "NUsedS=" << nUsedCl
- << "NUsed=" << nusedf
- << "Like=" << like
- << "S0.=" << &cseed[0]
- << "S1.=" << &cseed[1]
- << "S2.=" << &cseed[2]
- << "S3.=" << &cseed[3]
- << "S4.=" << &cseed[4]
- << "S5.=" << &cseed[5]
- << "Label=" << label
- << "Freq=" << frequency
- << "FitterT.=" << fitterT
- << "FitterTC.=" << fitterTC
- << "\n";
- }
-
- ntracks++;
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- if(ntracks == kMaxTracksStack){
- AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
- for(int isl=0; isl<4; isl++) delete layer[isl];
- return ntracks;
- }
- cseed += 6;
- }
- }
- }
- for(int isl=0; isl<4; isl++) delete layer[isl];
-
- return ntracks;
+//
+// Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are
+// either missed by TPC prolongation or conversions inside the TRD volume.
+// For stand alone tracking the procedure is used to estimate all tracks measured by TRD.
+//
+// Parameters :
+// layers : Array of stack propagation layers containing clusters
+// sseed : Array of empty tracklet seeds. On exit they are filled.
+// ipar : Control parameters:
+// ipar[0] -> seeding chambers configuration
+// ipar[1] -> stack index
+// ipar[2] -> number of track candidates found so far
+//
+// Output :
+// Number of tracks candidates found.
+//
+// The following steps are performed:
+// 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the
+// radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding
+// is described in AliTRDtrackerV1::Clusters2TracksStack().
+// 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm:
+// - for each seeding cluster in the lower seeding layer find
+// - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle
+// is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker.
+// - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the
+// reco params
+// - select last seeding cluster as the nearest to the linear approximation of the track described by the first three
+// seeding clusters.
+// The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond()
+// and AliTRDchamberTimeBin::GetClusters().
+// 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is
+// performed at this level
+// 4. Initialize seeding tracklets in the seeding chambers.
+// 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params.
+// 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see
+// AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25).
+// 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed.
+// 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new
+// approximation of the track.
+// 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are
+// checked against the Riemann fit:
+// - position resolution in y
+// - angular resolution in the bending plane
+// - likelihood of the number of clusters attached to the tracklet
+// 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers:
+// - Initialization of extrapolation tracklets with the fit parameters
+// - Attach clusters to extrapolated tracklets
+// - Helix fit of tracklets
+// 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track
+// See AliTRDtrackerV1::ImproveSeedQuality() for details.
+// 12. Helix fit of all 6 seeding tracklets and chi2 calculation
+// 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
+// 14. Cooking labels for tracklets. Should be done only for MC
+// 15. Register seeds.
+//
+// Authors:
+// Marian Ivanov <M.Ivanov@gsi.de>
+// Alexandru Bercuci <A.Bercuci@gsi.de>
+// Markus Fasel <M.Fasel@gsi.de>
+
+ AliTRDtrackingChamber *chamber = 0x0;
+ AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
+ AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
+ Int_t ncl, mcl; // working variable for looping over clusters
+ Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
+ // chi2 storage
+ // chi2[0] = tracklet chi2 on the Z direction
+ // chi2[1] = tracklet chi2 on the R direction
+ Double_t chi2[4];
+
+ // this should be data member of AliTRDtrack TODO
+ Double_t seedQuality[kMaxTracksStack];
+
+ // unpack control parameters
+ Int_t config = ipar[0];
+ Int_t ntracks = ipar[1];
+ Int_t istack = ipar[2];
+ Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
+ Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
+
+
+ // Init chambers geometry
+ Double_t hL[kNPlanes]; // Tilting angle
+ Float_t padlength[kNPlanes]; // pad lenghts
+ Float_t padwidth[kNPlanes]; // pad widths
+ AliTRDpadPlane *pp = 0x0;
+ for(int iplane=0; iplane<kNPlanes; iplane++){
+ pp = fGeom->GetPadPlane(iplane, istack);
+ hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
+ padlength[iplane] = pp->GetLengthIPad();
+ padwidth[iplane] = pp->GetWidthIPad();
+ }
+
+ // Init anode wire position for chambers
+ Double_t x0[kNPlanes], // anode wire position
+ driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length
+ TGeoHMatrix *matrix = 0x0;
+ Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.};
+ Double_t glb[] = {0., 0., 0.};
+ AliTRDtrackingChamber **cIter = &stack[0];
+ for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){
+ if(!(*cIter)) continue;
+ if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){
+ continue;
+ x0[iLayer] = fgkX0[iLayer];
+ }
+ matrix->LocalToMaster(loc, glb);
+ x0[iLayer] = glb[0];
+ }
+
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 2){
+ AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
+ }
+
+ // Build seeding layers
+ ResetSeedTB();
+ Int_t nlayers = 0;
+ for(int isl=0; isl<kNSeedPlanes; isl++){
+ if(!(chamber = stack[planes[isl]])) continue;
+ if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
+ nlayers++;
+ }
+ if(nlayers < kNSeedPlanes) return ntracks;
+
+
+ // Start finding seeds
+ Double_t cond0[4], cond1[4], cond2[4];
+ Int_t icl = 0;
+ while((c[3] = (*fSeedTB[3])[icl++])){
+ if(!c[3]) continue;
+ fSeedTB[0]->BuildCond(c[3], cond0, 0);
+ fSeedTB[0]->GetClusters(cond0, index, ncl);
+ //printf("Found c[3] candidates 0 %d\n", ncl);
+ Int_t jcl = 0;
+ while(jcl<ncl) {
+ c[0] = (*fSeedTB[0])[index[jcl++]];
+ if(!c[0]) continue;
+ Double_t dx = c[3]->GetX() - c[0]->GetX();
+ Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx;
+ Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx;
+ fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx);
+ fSeedTB[1]->GetClusters(cond1, jndex, mcl);
+ //printf("Found c[0] candidates 1 %d\n", mcl);
+
+ Int_t kcl = 0;
+ while(kcl<mcl) {
+ c[1] = (*fSeedTB[1])[jndex[kcl++]];
+ if(!c[1]) continue;
+ fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx);
+ c[2] = fSeedTB[2]->GetNearestCluster(cond2);
+ //printf("Found c[1] candidate 2 %p\n", c[2]);
+ if(!c[2]) continue;
+
+ //AliInfo("Seeding clusters found. Building seeds ...");
+ //for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ());
+
+ for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
+
+ FitRieman(c, chi2);
+
+ AliTRDseedV1 *tseed = &cseed[0];
+ cIter = &stack[0];
+ for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
+ Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1;
+ tseed->SetDetector(det);
+ tseed->SetTilt(hL[iLayer]);
+ tseed->SetPadLength(padlength[iLayer]);
+ tseed->SetPadWidth(padwidth[iLayer]);
+ tseed->SetReconstructor(fReconstructor);
+ tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
+ tseed->Init(GetRiemanFitter());
+ tseed->SetStandAlone(kTRUE);
+ }
+
+ Bool_t isFake = kFALSE;
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
+ if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
+ if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
+ if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
+
+ Double_t xpos[4];
+ for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
+ Float_t yref[4];
+ for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
+ Int_t ll = c[3]->GetLabel(0);
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ AliRieman *rim = GetRiemanFitter();
+ TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ cs0 << "MakeSeeds0"
+ <<"EventNumber=" << eventNumber
+ <<"CandidateNumber=" << candidateNumber
+ <<"isFake=" << isFake
+ <<"config=" << config
+ <<"label=" << ll
+ <<"chi2z=" << chi2[0]
+ <<"chi2y=" << chi2[1]
+ <<"Y2exp=" << cond2[0]
+ <<"Z2exp=" << cond2[1]
+ <<"X0=" << xpos[0] //layer[sLayer]->GetX()
+ <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
+ <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
+ <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
+ <<"yref0=" << yref[0]
+ <<"yref1=" << yref[1]
+ <<"yref2=" << yref[2]
+ <<"yref3=" << yref[3]
+ <<"c0.=" << c[0]
+ <<"c1.=" << c[1]
+ <<"c2.=" << c[2]
+ <<"c3.=" << c[3]
+ <<"Seed0.=" << &cseed[planes[0]]
+ <<"Seed1.=" << &cseed[planes[1]]
+ <<"Seed2.=" << &cseed[planes[2]]
+ <<"Seed3.=" << &cseed[planes[3]]
+ <<"RiemanFitter.=" << rim
+ <<"\n";
+ }
+ if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
+ //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
+ //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ //AliInfo("Passed chi2 filter.");
+
+ // try attaching clusters to tracklets
+ Int_t mlayers = 0;
+ AliTRDcluster *cl = NULL;
+ for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
+ Int_t jLayer = planes[iLayer];
+ Int_t nNotInChamber = 0;
+ if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue;
+ cseed[jLayer].Fit();
+ cseed[jLayer].UpdateUsed();
+ cseed[jLayer].ResetClusterIter();
+ while((cl = cseed[jLayer].NextCluster())){
+ if(!cl->IsInChamber()) nNotInChamber++;
+ }
+ //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber);
+ if(cseed[jLayer].GetN() - (cseed[jLayer].GetNUsed() + nNotInChamber) < 5) continue; // checking for Cluster which are not in chamber is a much stronger restriction on real data
+ mlayers++;
+ }
+
+ if(mlayers < kNSeedPlanes){
+ //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+
+ // temporary exit door for the HLT
+ if(fReconstructor->IsHLT()){
+ // attach clusters to extrapolation chambers
+ for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
+ Int_t jLayer = planesExt[iLayer];
+ if(!(chamber = stack[jLayer])) continue;
+ cseed[jLayer].AttachClusters(chamber, kTRUE);
+ cseed[jLayer].Fit();
+ }
+ fTrackQuality[ntracks] = 1.; // dummy value
+ ntracks++;
+ if(ntracks == kMaxTracksStack) return ntracks;
+ cseed += 6;
+ continue;
+ }
+
+
+ // Update Seeds and calculate Likelihood
+ // fit tracklets and cook likelihood
+ FitTiltedRieman(&cseed[0], kTRUE);
+ for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
+ Int_t jLayer = planes[iLayer];
+ cseed[jLayer].Fit(kTRUE);
+ }
+ Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
+
+ if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
+ //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
+
+ // book preliminary results
+ seedQuality[ntracks] = like;
+ fSeedLayer[ntracks] = config;/*sLayer;*/
+
+ // attach clusters to the extrapolation seeds
+ for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
+ Int_t jLayer = planesExt[iLayer];
+ if(!(chamber = stack[jLayer])) continue;
+
+ // fit extrapolated seed
+ if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
+ if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
+ AliTRDseedV1 pseed = cseed[jLayer];
+ if(!pseed.AttachClusters(chamber, kTRUE)) continue;
+ pseed.Fit(kTRUE);
+ cseed[jLayer] = pseed;
+ FitTiltedRieman(cseed, kTRUE);
+ cseed[jLayer].Fit(kTRUE);
+ }
+
+ // AliInfo("Extrapolation done.");
+ // Debug Stream containing all the 6 tracklets
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ cstreamer << "MakeSeeds1"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "S0.=" << &cseed[0]
+ << "S1.=" << &cseed[1]
+ << "S2.=" << &cseed[2]
+ << "S3.=" << &cseed[3]
+ << "S4.=" << &cseed[4]
+ << "S5.=" << &cseed[5]
+ << "FitterT.=" << tiltedRieman
+ << "\n";
+ }
+
+ if(fReconstructor->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ continue;
+ }
+ //AliInfo("Improve seed quality done.");
+
+ // fit full track and cook likelihoods
+ // Double_t curv = FitRieman(&cseed[0], chi2);
+ // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
+ // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
+
+ // do the final track fitting (Once with vertex constraint and once without vertex constraint)
+ Double_t chi2Vals[3];
+ chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
+ if(fReconstructor->HasVertexConstrained())
+ chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
+ else
+ chi2Vals[1] = 1.;
+ chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
+ // Chi2 definitions in testing stage
+ //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
+ fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
+ //AliInfo("Hyperplane fit done\n");
+
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
+ TLinearFitter *fitterT = GetTiltedRiemanFitter();
+ Int_t ncls = 0;
+ for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
+ ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
+ }
+ cstreamer << "MakeSeeds2"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "Chi2TR=" << chi2Vals[0]
+ << "Chi2TC=" << chi2Vals[1]
+ << "Nlayers=" << mlayers
+ << "NClusters=" << ncls
+ << "Like=" << like
+ << "S0.=" << &cseed[0]
+ << "S1.=" << &cseed[1]
+ << "S2.=" << &cseed[2]
+ << "S3.=" << &cseed[3]
+ << "S4.=" << &cseed[4]
+ << "S5.=" << &cseed[5]
+ << "FitterT.=" << fitterT
+ << "FitterTC.=" << fitterTC
+ << "\n";
+ }
+
+ ntracks++;
+ AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
+ if(ntracks == kMaxTracksStack){
+ AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
+ return ntracks;
+ }
+ cseed += 6;
+ }
+ }
+ }
+
+ return ntracks;
}
//_____________________________________________________________________________
AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
{
- //
- // Build a TRD track out of tracklet candidates
- //
- // Parameters :
- // seeds : array of tracklets
- // params : track parameters (see MakeSeeds() function body for a detailed description)
- //
- // Output :
- // The TRD track.
- //
- // Detailed description
- //
- // To be discussed with Marian !!
- //
-
- AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
- if (!calibra) AliInfo("Could not get Calibra instance\n");
-
- Double_t alpha = AliTRDgeometry::GetAlpha();
- Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
- Double_t c[15];
-
- c[ 0] = 0.2;
- c[ 1] = 0.0; c[ 2] = 2.0;
- c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
- c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
- c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
-
- AliTRDtrackV1 *track = new AliTRDtrackV1(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift);
- track->PropagateTo(params[0]-5.0);
- track->ResetCovariance(1);
- Int_t nc = FollowBackProlongation(*track);
- //AliInfo(Form("N clusters for track %d", nc));
- if (nc < 30) {
- delete track;
- track = 0x0;
- } else {
- track->CookdEdx();
- track->CookdEdxTimBin(-1);
- track->CookLabel(.9);
- // computes PID for track
- track->CookPID();
- // update calibration references using this track
- if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(track);
- }
-
- return track;
+//
+// Build a TRD track out of tracklet candidates
+//
+// Parameters :
+// seeds : array of tracklets
+// params : array of track parameters as they are estimated by stand alone tracker. 7 elements.
+// [0] - radial position of the track at reference point
+// [1] - y position of the fit at [0]
+// [2] - z position of the fit at [0]
+// [3] - snp of the first tracklet
+// [4] - tgl of the first tracklet
+// [5] - curvature of the Riemann fit - 1/pt
+// [6] - sector rotation angle
+//
+// Output :
+// The TRD track.
+//
+// Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix
+// (diagonal with constant variance terms TODO - correct parameterization)
+//
+// In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the
+// offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation()
+// for details). Do also MC label calculation and PID if propagation successfully.
+
+
+ Double_t alpha = AliTRDgeometry::GetAlpha();
+ Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
+ Double_t c[15];
+
+ c[ 0] = 0.2; // s^2_y
+ c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z
+ c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp
+ c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl
+ c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; // s^2_1/pt
+
+ AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift);
+ track.PropagateTo(params[0]-5.0);
+ AliTRDseedV1 *ptrTracklet = 0x0;
+
+ // skip Kalman filter for HLT
+ if(fReconstructor->IsHLT()){
+ for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
+ track.UnsetTracklet(jLayer);
+ ptrTracklet = &seeds[jLayer];
+ if(!ptrTracklet->IsOK()) continue;
+ if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian
+ ptrTracklet = SetTracklet(ptrTracklet);
+ ptrTracklet->UseClusters();
+ track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
+ }
+ AliTRDtrackV1 *ptrTrack = SetTrack(&track);
+ ptrTrack->CookPID();
+ ptrTrack->SetReconstructor(fReconstructor);
+ return ptrTrack;
+ }
+
+ track.ResetCovariance(1);
+ Int_t nc = TMath::Abs(FollowBackProlongation(track));
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ Double_t p[5]; // Track Params for the Debug Stream
+ track.GetExternalParameters(params[0], p);
+ TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ cs << "MakeTrack"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "nc=" << nc
+ << "X=" << params[0]
+ << "Y=" << p[0]
+ << "Z=" << p[1]
+ << "snp=" << p[2]
+ << "tnd=" << p[3]
+ << "crv=" << p[4]
+ << "Yin=" << params[1]
+ << "Zin=" << params[2]
+ << "snpin=" << params[3]
+ << "tndin=" << params[4]
+ << "crvin=" << params[5]
+ << "track.=" << &track
+ << "\n";
+ }
+ if (nc < 30) return 0x0;
+
+ AliTRDtrackV1 *ptrTrack = SetTrack(&track);
+ ptrTrack->SetReconstructor(fReconstructor);
+ ptrTrack->CookLabel(.9);
+
+ // computes PID for track
+ ptrTrack->CookPID();
+ // update calibration references using this track
+ AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
+ if (!calibra){
+ AliInfo("Could not get Calibra instance\n");
+ if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
+ }
+ return ptrTrack;
}
//____________________________________________________________________
Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
{
- //
- // Sort tracklets according to "quality" and try to "improve" the first 4 worst
- //
- // Parameters :
- // layers : Array of propagation layers for a stack/supermodule
- // cseed : Array of 6 seeding tracklets which has to be improved
- //
- // Output :
- // cssed : Improved seeds
- //
- // Detailed description
- //
- // Iterative procedure in which new clusters are searched for each
- // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
- // can be maximized. If some optimization is found the old seeds are replaced.
- //
- // debug level: 7
- //
-
- // make a local working copy
- AliTRDtrackingChamber *chamber = 0x0;
- AliTRDseedV1 bseed[6];
- Int_t nLayers = 0;
- for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
-
- Float_t lastquality = 10000.0;
- Float_t lastchi2 = 10000.0;
- Float_t chi2 = 1000.0;
-
- for (Int_t iter = 0; iter < 4; iter++) {
- Float_t sumquality = 0.0;
- Float_t squality[6];
- Int_t sortindexes[6];
-
- for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
- squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : -1.;
- sumquality += squality[jLayer];
- }
- if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
-
- nLayers = 0;
- lastquality = sumquality;
- lastchi2 = chi2;
- if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
-
- TMath::Sort(6, squality, sortindexes, kFALSE);
- for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
- Int_t bLayer = sortindexes[jLayer];
- if(!(chamber = stack[bLayer])) continue;
- bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
- if(bseed[bLayer].IsOK()) nLayers++;
- }
-
- chi2 = FitTiltedRieman(bseed, kTRUE);
- if(AliTRDReconstructor::StreamLevel() >= 7){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- cstreamer << "ImproveSeedQuality"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "Iteration=" << iter
- << "S0.=" << &bseed[0]
- << "S1.=" << &bseed[1]
- << "S2.=" << &bseed[2]
- << "S3.=" << &bseed[3]
- << "S4.=" << &bseed[4]
- << "S5.=" << &bseed[5]
- << "FitterT.=" << tiltedRieman
- << "\n";
- }
- } // Loop: iter
-
- // we are sure that at least 2 tracklets are OK !
- return nLayers+2;
+ //
+ // Sort tracklets according to "quality" and try to "improve" the first 4 worst
+ //
+ // Parameters :
+ // layers : Array of propagation layers for a stack/supermodule
+ // cseed : Array of 6 seeding tracklets which has to be improved
+ //
+ // Output :
+ // cssed : Improved seeds
+ //
+ // Detailed description
+ //
+ // Iterative procedure in which new clusters are searched for each
+ // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
+ // can be maximized. If some optimization is found the old seeds are replaced.
+ //
+ // debug level: 7
+ //
+
+ // make a local working copy
+ AliTRDtrackingChamber *chamber = 0x0;
+ AliTRDseedV1 bseed[6];
+ Int_t nLayers = 0;
+ for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
+
+ Float_t lastquality = 10000.0;
+ Float_t lastchi2 = 10000.0;
+ Float_t chi2 = 1000.0;
+
+ for (Int_t iter = 0; iter < 4; iter++) {
+ Float_t sumquality = 0.0;
+ Float_t squality[6];
+ Int_t sortindexes[6];
+
+ for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
+ squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
+ sumquality += squality[jLayer];
+ }
+ if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
+
+ nLayers = 0;
+ lastquality = sumquality;
+ lastchi2 = chi2;
+ if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
+
+ TMath::Sort(6, squality, sortindexes, kFALSE);
+ for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
+ Int_t bLayer = sortindexes[jLayer];
+ if(!(chamber = stack[bLayer])) continue;
+ bseed[bLayer].AttachClusters(chamber, kTRUE);
+ bseed[bLayer].Fit(kTRUE);
+ if(bseed[bLayer].IsOK()) nLayers++;
+ }
+
+ chi2 = FitTiltedRieman(bseed, kTRUE);
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ cstreamer << "ImproveSeedQuality"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "Iteration=" << iter
+ << "S0.=" << &bseed[0]
+ << "S1.=" << &bseed[1]
+ << "S2.=" << &bseed[2]
+ << "S3.=" << &bseed[3]
+ << "S4.=" << &bseed[4]
+ << "S5.=" << &bseed[5]
+ << "FitterT.=" << tiltedRieman
+ << "\n";
+ }
+ } // Loop: iter
+ // we are sure that at least 2 tracklets are OK !
+ return nLayers+2;
}
//_________________________________________________________________________
Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
- //
- // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
- // the track selection
- // The likelihood value containes:
- // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
- // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
- // For all Parameters an exponential dependency is used
- //
- // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
- // - Array of chi2 values:
- // * Non-Constrained Tilted Riemann fit
- // * Vertex-Constrained Tilted Riemann fit
- // * z-Direction from Linear fit
- // Output: - The calculated track likelihood
- //
- // debug level 2
- //
-
- Double_t sumdaf = 0, nLayers = 0;
- for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
- if(!tracklets[iLayer].IsOK()) continue;
- sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
- nLayers++;
- }
- sumdaf /= Float_t (nLayers - 2.0);
-
- Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
- Double_t likeChi2TC = TMath::Exp(-chi2[1] * 0.677); // Constrained Tilted Riemann
- Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
- Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
- Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
-
- if(AliTRDReconstructor::StreamLevel() >= 2){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- cstreamer << "CalculateTrackLikelihood0"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "LikeChi2Z=" << likeChi2Z
- << "LikeChi2TR=" << likeChi2TR
- << "LikeChi2TC=" << likeChi2TC
- << "LikeAF=" << likeAF
- << "TrackLikelihood=" << trackLikelihood
- << "\n";
- }
-
- return trackLikelihood;
+ //
+ // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
+ // the track selection
+ // The likelihood value containes:
+ // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
+ // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
+ // For all Parameters an exponential dependency is used
+ //
+ // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
+ // - Array of chi2 values:
+ // * Non-Constrained Tilted Riemann fit
+ // * Vertex-Constrained Tilted Riemann fit
+ // * z-Direction from Linear fit
+ // Output: - The calculated track likelihood
+ //
+ // debug level 2
+ //
+
+ Double_t chi2phi = 0, nLayers = 0;
+ for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
+ if(!tracklets[iLayer].IsOK()) continue;
+ chi2phi += tracklets[iLayer].GetChi2Phi();
+ nLayers++;
+ }
+ chi2phi /= Float_t (nLayers - 2.0);
+
+ Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
+ Double_t likeChi2TC = (fReconstructor->HasVertexConstrained()) ?
+ TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
+ Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann
+ Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23
+ Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi;
+
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ cstreamer << "CalculateTrackLikelihood0"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "LikeChi2Z=" << likeChi2Z
+ << "LikeChi2TR=" << likeChi2TR
+ << "LikeChi2TC=" << likeChi2TC
+ << "LikeChi2Phi=" << likeChi2Phi
+ << "TrackLikelihood=" << trackLikelihood
+ << "\n";
+ }
+
+ return trackLikelihood;
}
//____________________________________________________________________
-Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]
- , Double_t *chi2)
+Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
{
- //
- // Calculate the probability of this track candidate.
- //
- // Parameters :
- // cseeds : array of candidate tracklets
- // planes : array of seeding planes (see seeding configuration)
- // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
- //
- // Output :
- // likelihood value
- //
- // Detailed description
- //
- // The track quality is estimated based on the following 4 criteria:
- // 1. precision of the rieman fit on the Y direction (likea)
- // 2. chi2 on the Y direction (likechi2y)
- // 3. chi2 on the Z direction (likechi2z)
- // 4. number of attached clusters compared to a reference value
- // (see AliTRDrecoParam::fkFindable) (likeN)
- //
- // The distributions for each type of probabilities are given below as of
- // (date). They have to be checked to assure consistency of estimation.
- //
-
- // ratio of the total number of clusters/track which are expected to be found by the tracker.
- Float_t fgFindable = AliTRDReconstructor::RecoParam()->GetFindableClusters();
-
-
- Int_t nclusters = 0;
- Double_t sumda = 0.;
- for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
- Int_t jlayer = planes[ilayer];
- nclusters += cseed[jlayer].GetN2();
- sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
- }
- Double_t likea = TMath::Exp(-sumda*10.6);
- Double_t likechi2y = 0.0000000001;
- if (chi2[0] < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2[0]) * 7.73);
- Double_t likechi2z = TMath::Exp(-chi2[1] * 0.088) / TMath::Exp(-chi2[1] * 0.019);
- Int_t enc = Int_t(fgFindable*4.*fgNTimeBins); // Expected Number Of Clusters, normally 72
- Double_t likeN = TMath::Exp(-(enc - nclusters) * 0.19);
-
- Double_t like = likea * likechi2y * likechi2z * likeN;
-
- // AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN));
- if(AliTRDReconstructor::StreamLevel() >= 2){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- // The Debug Stream contains the seed
- TTreeSRedirector &cstreamer = *fgDebugStreamer;
- cstreamer << "CookLikelihood"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "tracklet0.=" << &cseed[0]
- << "tracklet1.=" << &cseed[1]
- << "tracklet2.=" << &cseed[2]
- << "tracklet3.=" << &cseed[3]
- << "tracklet4.=" << &cseed[4]
- << "tracklet5.=" << &cseed[5]
- << "sumda=" << sumda
- << "chi0=" << chi2[0]
- << "chi1=" << chi2[1]
- << "likea=" << likea
- << "likechi2y=" << likechi2y
- << "likechi2z=" << likechi2z
- << "nclusters=" << nclusters
- << "likeN=" << likeN
- << "like=" << like
- << "\n";
- }
-
- return like;
+ //
+ // Calculate the probability of this track candidate.
+ //
+ // Parameters :
+ // cseeds : array of candidate tracklets
+ // planes : array of seeding planes (see seeding configuration)
+ // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
+ //
+ // Output :
+ // likelihood value
+ //
+ // Detailed description
+ //
+ // The track quality is estimated based on the following 4 criteria:
+ // 1. precision of the rieman fit on the Y direction (likea)
+ // 2. chi2 on the Y direction (likechi2y)
+ // 3. chi2 on the Z direction (likechi2z)
+ // 4. number of attached clusters compared to a reference value
+ // (see AliTRDrecoParam::fkFindable) (likeN)
+ //
+ // The distributions for each type of probabilities are given below as of
+ // (date). They have to be checked to assure consistency of estimation.
+ //
+
+ // ratio of the total number of clusters/track which are expected to be found by the tracker.
+ const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
+
+ Double_t chi2y = GetChi2Y(&cseed[0]);
+ Double_t chi2z = GetChi2Z(&cseed[0]);
+
+ Float_t nclusters = 0.;
+ Double_t sumda = 0.;
+ for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
+ Int_t jlayer = planes[ilayer];
+ nclusters += cseed[jlayer].GetN2();
+ sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1));
+ }
+ nclusters *= .25;
+
+ Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope());
+ Double_t likechi2y = 0.0000000001;
+ if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope());
+ Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope());
+ Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
+ Double_t like = likea * likechi2y * likechi2z * likeN;
+
+ if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
+ Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
+ Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
+ Int_t nTracklets = 0; Float_t mean_ncls = 0;
+ for(Int_t iseed=0; iseed < kNPlanes; iseed++){
+ if(!cseed[iseed].IsOK()) continue;
+ nTracklets++;
+ mean_ncls += cseed[iseed].GetN2();
+ }
+ if(nTracklets) mean_ncls /= nTracklets;
+ // The Debug Stream contains the seed
+ TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker);
+ cstreamer << "CookLikelihood"
+ << "EventNumber=" << eventNumber
+ << "CandidateNumber=" << candidateNumber
+ << "tracklet0.=" << &cseed[0]
+ << "tracklet1.=" << &cseed[1]
+ << "tracklet2.=" << &cseed[2]
+ << "tracklet3.=" << &cseed[3]
+ << "tracklet4.=" << &cseed[4]
+ << "tracklet5.=" << &cseed[5]
+ << "sumda=" << sumda
+ << "chi2y=" << chi2y
+ << "chi2z=" << chi2z
+ << "likea=" << likea
+ << "likechi2y=" << likechi2y
+ << "likechi2z=" << likechi2z
+ << "nclusters=" << nclusters
+ << "likeN=" << likeN
+ << "like=" << like
+ << "meanncls=" << mean_ncls
+ << "\n";
+ }
+
+ return like;
}
-
-
//____________________________________________________________________
void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
{
- //
- // Map seeding configurations to detector planes.
- //
- // Parameters :
- // iconfig : configuration index
- // planes : member planes of this configuration. On input empty.
- //
- // Output :
- // planes : contains the planes which are defining the configuration
- //
- // Detailed description
- //
- // Here is the list of seeding planes configurations together with
- // their topological classification:
- //
- // 0 - 5432 TQ 0
- // 1 - 4321 TQ 0
- // 2 - 3210 TQ 0
- // 3 - 5321 TQ 1
- // 4 - 4210 TQ 1
- // 5 - 5431 TQ 1
- // 6 - 4320 TQ 1
- // 7 - 5430 TQ 2
- // 8 - 5210 TQ 2
- // 9 - 5421 TQ 3
- // 10 - 4310 TQ 3
- // 11 - 5410 TQ 4
- // 12 - 5420 TQ 5
- // 13 - 5320 TQ 5
- // 14 - 5310 TQ 5
- //
- // The topologic quality is modeled as follows:
- // 1. The general model is define by the equation:
- // p(conf) = exp(-conf/2)
- // 2. According to the topologic classification, configurations from the same
- // class are assigned the agerage value over the model values.
- // 3. Quality values are normalized.
- //
- // The topologic quality distribution as function of configuration is given below:
- //Begin_Html
-
// <img src="gif/topologicQA.gif">
- //End_Html
- //
-
- switch(iconfig){
- case 0: // 5432 TQ 0
- planes[0] = 2;
- planes[1] = 3;
- planes[2] = 4;
- planes[3] = 5;
- break;
- case 1: // 4321 TQ 0
- planes[0] = 1;
- planes[1] = 2;
- planes[2] = 3;
- planes[3] = 4;
- break;
- case 2: // 3210 TQ 0
- planes[0] = 0;
- planes[1] = 1;
- planes[2] = 2;
- planes[3] = 3;
- break;
- case 3: // 5321 TQ 1
- planes[0] = 1;
- planes[1] = 2;
- planes[2] = 3;
- planes[3] = 5;
- break;
- case 4: // 4210 TQ 1
- planes[0] = 0;
- planes[1] = 1;
- planes[2] = 2;
- planes[3] = 4;
- break;
- case 5: // 5431 TQ 1
- planes[0] = 1;
- planes[1] = 3;
- planes[2] = 4;
- planes[3] = 5;
- break;
- case 6: // 4320 TQ 1
- planes[0] = 0;
- planes[1] = 2;
- planes[2] = 3;
- planes[3] = 4;
- break;
- case 7: // 5430 TQ 2
- planes[0] = 0;
- planes[1] = 3;
- planes[2] = 4;
- planes[3] = 5;
- break;
- case 8: // 5210 TQ 2
- planes[0] = 0;
- planes[1] = 1;
- planes[2] = 2;
- planes[3] = 5;
- break;
- case 9: // 5421 TQ 3
- planes[0] = 1;
- planes[1] = 2;
- planes[2] = 4;
- planes[3] = 5;
- break;
- case 10: // 4310 TQ 3
- planes[0] = 0;
- planes[1] = 1;
- planes[2] = 3;
- planes[3] = 4;
- break;
- case 11: // 5410 TQ 4
- planes[0] = 0;
- planes[1] = 1;
- planes[2] = 4;
- planes[3] = 5;
- break;
- case 12: // 5420 TQ 5
- planes[0] = 0;
- planes[1] = 2;
- planes[2] = 4;
- planes[3] = 5;
- break;
- case 13: // 5320 TQ 5
- planes[0] = 0;
- planes[1] = 2;
- planes[2] = 3;
- planes[3] = 5;
- break;
- case 14: // 5310 TQ 5
- planes[0] = 0;
- planes[1] = 1;
- planes[2] = 3;
- planes[3] = 5;
- break;
- }
+ //
+ // Map seeding configurations to detector planes.
+ //
+ // Parameters :
+ // iconfig : configuration index
+ // planes : member planes of this configuration. On input empty.
+ //
+ // Output :
+ // planes : contains the planes which are defining the configuration
+ //
+ // Detailed description
+ //
+ // Here is the list of seeding planes configurations together with
+ // their topological classification:
+ //
+ // 0 - 5432 TQ 0
+ // 1 - 4321 TQ 0
+ // 2 - 3210 TQ 0
+ // 3 - 5321 TQ 1
+ // 4 - 4210 TQ 1
+ // 5 - 5431 TQ 1
+ // 6 - 4320 TQ 1
+ // 7 - 5430 TQ 2
+ // 8 - 5210 TQ 2
+ // 9 - 5421 TQ 3
+ // 10 - 4310 TQ 3
+ // 11 - 5410 TQ 4
+ // 12 - 5420 TQ 5
+ // 13 - 5320 TQ 5
+ // 14 - 5310 TQ 5
+ //
+ // The topologic quality is modeled as follows:
+ // 1. The general model is define by the equation:
+ // p(conf) = exp(-conf/2)
+ // 2. According to the topologic classification, configurations from the same
+ // class are assigned the agerage value over the model values.
+ // 3. Quality values are normalized.
+ //
+ // The topologic quality distribution as function of configuration is given below:
+ //Begin_Html
+ // <img src="gif/topologicQA.gif">
+ //End_Html
+ //
+
+ switch(iconfig){
+ case 0: // 5432 TQ 0
+ planes[0] = 2;
+ planes[1] = 3;
+ planes[2] = 4;
+ planes[3] = 5;
+ break;
+ case 1: // 4321 TQ 0
+ planes[0] = 1;
+ planes[1] = 2;
+ planes[2] = 3;
+ planes[3] = 4;
+ break;
+ case 2: // 3210 TQ 0
+ planes[0] = 0;
+ planes[1] = 1;
+ planes[2] = 2;
+ planes[3] = 3;
+ break;
+ case 3: // 5321 TQ 1
+ planes[0] = 1;
+ planes[1] = 2;
+ planes[2] = 3;
+ planes[3] = 5;
+ break;
+ case 4: // 4210 TQ 1
+ planes[0] = 0;
+ planes[1] = 1;
+ planes[2] = 2;
+ planes[3] = 4;
+ break;
+ case 5: // 5431 TQ 1
+ planes[0] = 1;
+ planes[1] = 3;
+ planes[2] = 4;
+ planes[3] = 5;
+ break;
+ case 6: // 4320 TQ 1
+ planes[0] = 0;
+ planes[1] = 2;
+ planes[2] = 3;
+ planes[3] = 4;
+ break;
+ case 7: // 5430 TQ 2
+ planes[0] = 0;
+ planes[1] = 3;
+ planes[2] = 4;
+ planes[3] = 5;
+ break;
+ case 8: // 5210 TQ 2
+ planes[0] = 0;
+ planes[1] = 1;
+ planes[2] = 2;
+ planes[3] = 5;
+ break;
+ case 9: // 5421 TQ 3
+ planes[0] = 1;
+ planes[1] = 2;
+ planes[2] = 4;
+ planes[3] = 5;
+ break;
+ case 10: // 4310 TQ 3
+ planes[0] = 0;
+ planes[1] = 1;
+ planes[2] = 3;
+ planes[3] = 4;
+ break;
+ case 11: // 5410 TQ 4
+ planes[0] = 0;
+ planes[1] = 1;
+ planes[2] = 4;
+ planes[3] = 5;
+ break;
+ case 12: // 5420 TQ 5
+ planes[0] = 0;
+ planes[1] = 2;
+ planes[2] = 4;
+ planes[3] = 5;
+ break;
+ case 13: // 5320 TQ 5
+ planes[0] = 0;
+ planes[1] = 2;
+ planes[2] = 3;
+ planes[3] = 5;
+ break;
+ case 14: // 5310 TQ 5
+ planes[0] = 0;
+ planes[1] = 1;
+ planes[2] = 3;
+ planes[3] = 5;
+ break;
+ }
}
//____________________________________________________________________
void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
{
- //
- // Returns the extrapolation planes for a seeding configuration.
- //
- // Parameters :
- // iconfig : configuration index
- // planes : planes which are not in this configuration. On input empty.
- //
- // Output :
- // planes : contains the planes which are not in the configuration
- //
- // Detailed description
- //
-
- switch(iconfig){
- case 0: // 5432 TQ 0
- planes[0] = 1;
- planes[1] = 0;
- break;
- case 1: // 4321 TQ 0
- planes[0] = 5;
- planes[1] = 0;
- break;
- case 2: // 3210 TQ 0
- planes[0] = 4;
- planes[1] = 5;
- break;
- case 3: // 5321 TQ 1
- planes[0] = 4;
- planes[1] = 0;
- break;
- case 4: // 4210 TQ 1
- planes[0] = 5;
- planes[1] = 3;
- break;
- case 5: // 5431 TQ 1
- planes[0] = 2;
- planes[1] = 0;
- break;
- case 6: // 4320 TQ 1
- planes[0] = 5;
- planes[1] = 1;
- break;
- case 7: // 5430 TQ 2
- planes[0] = 2;
- planes[1] = 1;
- break;
- case 8: // 5210 TQ 2
- planes[0] = 4;
- planes[1] = 3;
- break;
- case 9: // 5421 TQ 3
- planes[0] = 3;
- planes[1] = 0;
- break;
- case 10: // 4310 TQ 3
- planes[0] = 5;
- planes[1] = 2;
- break;
- case 11: // 5410 TQ 4
- planes[0] = 3;
- planes[1] = 2;
- break;
- case 12: // 5420 TQ 5
- planes[0] = 3;
- planes[1] = 1;
- break;
- case 13: // 5320 TQ 5
- planes[0] = 4;
- planes[1] = 1;
- break;
- case 14: // 5310 TQ 5
- planes[0] = 4;
- planes[1] = 2;
- break;
- }
+ //
+ // Returns the extrapolation planes for a seeding configuration.
+ //
+ // Parameters :
+ // iconfig : configuration index
+ // planes : planes which are not in this configuration. On input empty.
+ //
+ // Output :
+ // planes : contains the planes which are not in the configuration
+ //
+ // Detailed description
+ //
+
+ switch(iconfig){
+ case 0: // 5432 TQ 0
+ planes[0] = 1;
+ planes[1] = 0;
+ break;
+ case 1: // 4321 TQ 0
+ planes[0] = 5;
+ planes[1] = 0;
+ break;
+ case 2: // 3210 TQ 0
+ planes[0] = 4;
+ planes[1] = 5;
+ break;
+ case 3: // 5321 TQ 1
+ planes[0] = 4;
+ planes[1] = 0;
+ break;
+ case 4: // 4210 TQ 1
+ planes[0] = 5;
+ planes[1] = 3;
+ break;
+ case 5: // 5431 TQ 1
+ planes[0] = 2;
+ planes[1] = 0;
+ break;
+ case 6: // 4320 TQ 1
+ planes[0] = 5;
+ planes[1] = 1;
+ break;
+ case 7: // 5430 TQ 2
+ planes[0] = 2;
+ planes[1] = 1;
+ break;
+ case 8: // 5210 TQ 2
+ planes[0] = 4;
+ planes[1] = 3;
+ break;
+ case 9: // 5421 TQ 3
+ planes[0] = 3;
+ planes[1] = 0;
+ break;
+ case 10: // 4310 TQ 3
+ planes[0] = 5;
+ planes[1] = 2;
+ break;
+ case 11: // 5410 TQ 4
+ planes[0] = 3;
+ planes[1] = 2;
+ break;
+ case 12: // 5420 TQ 5
+ planes[0] = 3;
+ planes[1] = 1;
+ break;
+ case 13: // 5320 TQ 5
+ planes[0] = 4;
+ planes[1] = 1;
+ break;
+ case 14: // 5310 TQ 5
+ planes[0] = 4;
+ planes[1] = 2;
+ break;
+ }
}
//____________________________________________________________________
AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
{
- Int_t ncls = fClusters->GetEntriesFast();
- return idx >= 0 || idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
+ Int_t ncls = fClusters->GetEntriesFast();
+ return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
}
//____________________________________________________________________
-Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
- //
- // Calculates the reference x-position for the tilted Rieman fit defined as middle
- // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
- // are taken into account
- //
- // Parameters: - Array of tracklets(AliTRDseedV1)
- //
- // Output: - The reference x-position(Float_t)
- //
- Int_t nDistances = 0;
- Float_t meanDistance = 0.;
- Int_t startIndex = 5;
- for(Int_t il =5; il > 0; il--){
- if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
- Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
- meanDistance += xdiff;
- nDistances++;
- }
- if(tracklets[il].IsOK()) startIndex = il;
- }
- if(tracklets[0].IsOK()) startIndex = 0;
- if(!nDistances){
- // We should normally never get here
- Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
- Int_t iok = 0, idiff = 0;
- // This attempt is worse and should be avoided:
- // check for two chambers which are OK and repeat this without taking the mean value
- // Strategy avoids a division by 0;
- for(Int_t il = 5; il >= 0; il--){
- if(tracklets[il].IsOK()){
- xpos[iok] = tracklets[il].GetX0();
- iok++;
- startIndex = il;
- }
- if(iok) idiff++; // to get the right difference;
- if(iok > 1) break;
- }
- if(iok > 1){
- meanDistance = (xpos[0] - xpos[1])/idiff;
- }
- else{
- // we have do not even have 2 layers which are OK? The we do not need to fit at all
- return 331.;
- }
- }
- else{
- meanDistance /= nDistances;
- }
- return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
+AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
+{
+ Int_t ntrklt = fTracklets->GetEntriesFast();
+ return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
}
-//_____________________________________________________________________________
-Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
- , Int_t *outlist, Bool_t down)
-{
- //
- // Sort eleements according occurancy
- // The size of output array has is 2*n
- //
-
- if (n <= 0) {
- return 0;
- }
+//____________________________________________________________________
+AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
+{
+ Int_t ntrk = fTracks->GetEntriesFast();
+ return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
+}
- Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
- Int_t *sindexF = new Int_t[2*n];
- for (Int_t i = 0; i < n; i++) {
- sindexF[i] = 0;
- }
- TMath::Sort(n,inlist,sindexS,down);
-
- Int_t last = inlist[sindexS[0]];
- Int_t val = last;
- sindexF[0] = 1;
- sindexF[0+n] = last;
- Int_t countPos = 0;
-
- // Find frequency
- for (Int_t i = 1; i < n; i++) {
- val = inlist[sindexS[i]];
- if (last == val) {
- sindexF[countPos]++;
- }
- else {
- countPos++;
- sindexF[countPos+n] = val;
- sindexF[countPos]++;
- last = val;
- }
- }
- if (last == val) {
- countPos++;
- }
- // Sort according frequency
- TMath::Sort(countPos,sindexF,sindexS,kTRUE);
+// //_____________________________________________________________________________
+// Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
+// , Int_t *outlist, Bool_t down)
+// {
+// //
+// // Sort eleements according occurancy
+// // The size of output array has is 2*n
+// //
+//
+// if (n <= 0) {
+// return 0;
+// }
+//
+// Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
+// Int_t *sindexF = new Int_t[2*n];
+// for (Int_t i = 0; i < n; i++) {
+// sindexF[i] = 0;
+// }
+//
+// TMath::Sort(n,inlist,sindexS,down);
+//
+// Int_t last = inlist[sindexS[0]];
+// Int_t val = last;
+// sindexF[0] = 1;
+// sindexF[0+n] = last;
+// Int_t countPos = 0;
+//
+// // Find frequency
+// for (Int_t i = 1; i < n; i++) {
+// val = inlist[sindexS[i]];
+// if (last == val) {
+// sindexF[countPos]++;
+// }
+// else {
+// countPos++;
+// sindexF[countPos+n] = val;
+// sindexF[countPos]++;
+// last = val;
+// }
+// }
+// if (last == val) {
+// countPos++;
+// }
+//
+// // Sort according frequency
+// TMath::Sort(countPos,sindexF,sindexS,kTRUE);
+//
+// for (Int_t i = 0; i < countPos; i++) {
+// outlist[2*i ] = sindexF[sindexS[i]+n];
+// outlist[2*i+1] = sindexF[sindexS[i]];
+// }
+//
+// delete [] sindexS;
+// delete [] sindexF;
+//
+// return countPos;
+//
+// }
- for (Int_t i = 0; i < countPos; i++) {
- outlist[2*i ] = sindexF[sindexS[i]+n];
- outlist[2*i+1] = sindexF[sindexS[i]];
- }
- delete [] sindexS;
- delete [] sindexF;
-
- return countPos;
+//____________________________________________________________________
+void AliTRDtrackerV1::ResetSeedTB()
+{
+// reset buffer for seeding time bin layers. If the time bin
+// layers are not allocated this function allocates them
+ for(Int_t isl=0; isl<kNSeedPlanes; isl++){
+ if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
+ else fSeedTB[isl]->Clear();
+ }
}
+
//_____________________________________________________________________________
Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
{
- // Chi2 definition on y-direction
-
- Float_t chi2 = 0;
- for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
- if(!tracklets[ipl].IsOK()) continue;
- Double_t distLayer = tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0);
- chi2 += distLayer * distLayer;
- }
- return chi2;
+ // Calculates normalized chi2 in y-direction
+ // chi2 = Sum chi2 / n_tracklets
+
+ Double_t chi2 = 0.; Int_t n = 0;
+ for(Int_t ipl = kNPlanes; ipl--;){
+ if(!tracklets[ipl].IsOK()) continue;
+ chi2 += tracklets[ipl].GetChi2Y();
+ n++;
+ }
+ return n ? chi2/n : 0.;
}
//_____________________________________________________________________________
Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
{
- // Chi2 definition on z-direction
+ // Calculates normalized chi2 in z-direction
+ // chi2 = Sum chi2 / n_tracklets
+
+ Double_t chi2 = 0; Int_t n = 0;
+ for(Int_t ipl = kNPlanes; ipl--;){
+ if(!tracklets[ipl].IsOK()) continue;
+ chi2 += tracklets[ipl].GetChi2Z();
+ n++;
+ }
+ return n ? chi2/n : 0.;
+}
- Float_t chi2 = 0;
- for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
- if(!tracklets[ipl].IsOK()) continue;
- Double_t distLayer = tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0);
- chi2 += distLayer * distLayer;
+//____________________________________________________________________
+Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
+ //
+ // Calculates the reference x-position for the tilted Rieman fit defined as middle
+ // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
+ // are taken into account
+ //
+ // Parameters: - Array of tracklets(AliTRDseedV1)
+ //
+ // Output: - The reference x-position(Float_t)
+ // Only kept for compatibility with the old code
+ //
+ Int_t nDistances = 0;
+ Float_t meanDistance = 0.;
+ Int_t startIndex = 5;
+ for(Int_t il =5; il > 0; il--){
+ if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
+ Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
+ meanDistance += xdiff;
+ nDistances++;
+ }
+ if(tracklets[il].IsOK()) startIndex = il;
+ }
+ if(tracklets[0].IsOK()) startIndex = 0;
+ if(!nDistances){
+ // We should normally never get here
+ Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
+ Int_t iok = 0, idiff = 0;
+ // This attempt is worse and should be avoided:
+ // check for two chambers which are OK and repeat this without taking the mean value
+ // Strategy avoids a division by 0;
+ for(Int_t il = 5; il >= 0; il--){
+ if(tracklets[il].IsOK()){
+ xpos[iok] = tracklets[il].GetX0();
+ iok++;
+ startIndex = il;
+ }
+ if(iok) idiff++; // to get the right difference;
+ if(iok > 1) break;
+ }
+ if(iok > 1){
+ meanDistance = (xpos[0] - xpos[1])/idiff;
+ }
+ else{
+ // we have do not even have 2 layers which are OK? The we do not need to fit at all
+ return 331.;
+ }
+ }
+ else{
+ meanDistance /= nDistances;
}
- return chi2;
+ return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *tracklets){
+ //
+ // Track Fitter Function using the new class implementation of
+ // the Rieman fit
+ //
+ AliTRDtrackFitterRieman fitter;
+ fitter.SetRiemanFitter(GetTiltedRiemanFitter());
+ fitter.Reset();
+ for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) fitter.SetTracklet(il, &tracklets[il]);
+ Double_t chi2 = fitter.Eval();
+ // Update the tracklets
+ Double_t cov[15]; Double_t x0;
+ memset(cov, 0, sizeof(Double_t) * 15);
+ for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++){
+ x0 = tracklets[il].GetX0();
+ tracklets[il].SetYref(0, fitter.GetYat(x0));
+ tracklets[il].SetZref(0, fitter.GetZat(x0));
+ tracklets[il].SetYref(1, fitter.GetDyDxAt(x0));
+ tracklets[il].SetZref(1, fitter.GetDzDx());
+ tracklets[il].SetC(fitter.GetCurvature());
+ fitter.GetCovAt(x0, cov);
+ tracklets[il].SetCovRef(cov);
+ tracklets[il].SetChi2(chi2);
+ }
+ return chi2;
}
///////////////////////////////////////////////////////
//_____________________________________________________________________________
AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
- //
- // Constructor of the nested class AliTRDtrackFitterLeastSquare
- //
- memset(fParams, 0, sizeof(Double_t) * 2);
- memset(fSums, 0, sizeof(Double_t) * 5);
- memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
+ //
+ // Constructor of the nested class AliTRDtrackFitterLeastSquare
+ //
+ memset(fParams, 0, sizeof(Double_t) * 2);
+ memset(fSums, 0, sizeof(Double_t) * 5);
+ memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
}
//_____________________________________________________________________________
void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
- //
- // Adding Point to the fitter
- //
- Double_t weight = 1/(sigmaY * sigmaY);
- Double_t &xpt = *x;
- // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
- fSums[0] += weight;
- fSums[1] += weight * xpt;
- fSums[2] += weight * y;
- fSums[3] += weight * xpt * y;
- fSums[4] += weight * xpt * xpt;
- fSums[5] += weight * y * y;
+ //
+ // Adding Point to the fitter
+ //
+ Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
+ weight *= weight;
+ Double_t &xpt = *x;
+ // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
+ fSums[0] += weight;
+ fSums[1] += weight * xpt;
+ fSums[2] += weight * y;
+ fSums[3] += weight * xpt * y;
+ fSums[4] += weight * xpt * xpt;
+ fSums[5] += weight * y * y;
}
//_____________________________________________________________________________
void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
- //
- // Remove Point from the sample
- //
- Double_t weight = 1/(sigmaY * sigmaY);
- Double_t &xpt = *x;
- fSums[0] -= weight;
- fSums[1] -= weight * xpt;
- fSums[2] -= weight * y;
- fSums[3] -= weight * xpt * y;
- fSums[4] -= weight * xpt * xpt;
- fSums[5] -= weight * y * y;
+ //
+ // Remove Point from the sample
+ //
+
+ Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
+ weight *= weight;
+ Double_t &xpt = *x;
+ fSums[0] -= weight;
+ fSums[1] -= weight * xpt;
+ fSums[2] -= weight * y;
+ fSums[3] -= weight * xpt * y;
+ fSums[4] -= weight * xpt * xpt;
+ fSums[5] -= weight * y * y;
}
//_____________________________________________________________________________
void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
- //
- // Evaluation of the fit:
- // Calculation of the parameters
- // Calculation of the covariance matrix
- //
-
- Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
- // for(Int_t isum = 0; isum < 5; isum++)
- // printf("fSums[%d] = %f\n", isum, fSums[isum]);
- // printf("denominator = %f\n", denominator);
- fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
- fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
- // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
-
- // Covariance matrix
- fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
- fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
- fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
+ //
+ // Evaluation of the fit:
+ // Calculation of the parameters
+ // Calculation of the covariance matrix
+ //
+
+ Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
+ if(denominator==0) return;
+
+ // for(Int_t isum = 0; isum < 5; isum++)
+ // printf("fSums[%d] = %f\n", isum, fSums[isum]);
+ // printf("denominator = %f\n", denominator);
+ fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
+ fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
+ // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
+
+ // Covariance matrix
+ fCovarianceMatrix[0] = fSums[4] / fSums[0] - fSums[1] * fSums[1] / (fSums[0] * fSums[0]);
+ fCovarianceMatrix[1] = fSums[5] / fSums[0] - fSums[2] * fSums[2] / (fSums[0] * fSums[0]);
+ fCovarianceMatrix[2] = fSums[3] / fSums[0] - fSums[1] * fSums[2] / (fSums[0] * fSums[0]);
}
//_____________________________________________________________________________
Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
- //
- // Returns the Function value of the fitted function at a given x-position
- //
- return fParams[0] + fParams[1] * (*xpos);
+ //
+ // Returns the Function value of the fitted function at a given x-position
+ //
+ return fParams[0] + fParams[1] * (*xpos);
}
//_____________________________________________________________________________
void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
- //
- // Copies the values of the covariance matrix into the storage
- //
- memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
+ //
+ // Copies the values of the covariance matrix into the storage
+ //
+ memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDLeastSquare::Reset(){
+ //
+ // Reset the fitter
+ //
+ memset(fParams, 0, sizeof(Double_t) * 2);
+ memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
+ memset(fSums, 0, sizeof(Double_t) * 6);
+}
+
+///////////////////////////////////////////////////////
+// //
+// Resources of class AliTRDtrackFitterRieman //
+// //
+///////////////////////////////////////////////////////
+
+//_____________________________________________________________________________
+AliTRDtrackerV1::AliTRDtrackFitterRieman::AliTRDtrackFitterRieman():
+ fTrackFitter(NULL),
+ fZfitter(NULL),
+ fCovarPolY(NULL),
+ fCovarPolZ(NULL),
+ fXref(0.),
+ fSysClusterError(0.)
+{
+ //
+ // Default constructor
+ //
+ fZfitter = new AliTRDLeastSquare;
+ fCovarPolY = new TMatrixD(3,3);
+ fCovarPolZ = new TMatrixD(2,2);
+ memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * 6);
+ memset(fParameters, 0, sizeof(Double_t) * 5);
+ memset(fSumPolY, 0, sizeof(Double_t) * 5);
+ memset(fSumPolZ, 0, sizeof(Double_t) * 2);
}
+//_____________________________________________________________________________
+AliTRDtrackerV1::AliTRDtrackFitterRieman::~AliTRDtrackFitterRieman(){
+ //
+ // Destructor
+ //
+ if(fZfitter) delete fZfitter;
+ if(fCovarPolY) delete fCovarPolY;
+ if(fCovarPolZ) delete fCovarPolZ;
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDtrackFitterRieman::Reset(){
+ //
+ // Reset the Fitter
+ //
+ if(fTrackFitter){
+ fTrackFitter->StoreData(kTRUE);
+ fTrackFitter->ClearPoints();
+ }
+ if(fZfitter){
+ fZfitter->Reset();
+ }
+ fXref = 0.;
+ memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * AliTRDgeometry::kNlayer);
+ memset(fParameters, 0, sizeof(Double_t) * 5);
+ memset(fSumPolY, 0, sizeof(Double_t) * 5);
+ memset(fSumPolZ, 0, sizeof(Double_t) * 2);
+ for(Int_t irow = 0; irow < fCovarPolY->GetNrows(); irow++)
+ for(Int_t icol = 0; icol < fCovarPolY->GetNcols(); icol++){
+ (*fCovarPolY)(irow, icol) = 0.;
+ if(irow < 2 && icol < 2)
+ (*fCovarPolZ)(irow, icol) = 0.;
+ }
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDtrackFitterRieman::SetTracklet(Int_t itr, AliTRDseedV1 *tracklet){
+ //
+ // Add tracklet into the fitter
+ //
+ if(itr >= AliTRDgeometry::kNlayer) return;
+ fTracklets[itr] = tracklet;
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::Eval(){
+ //
+ // Perform the fit
+ // 1. Apply linear transformation and store points in the fitter
+ // 2. Evaluate the fit
+ // 3. Check if the result of the fit in z-direction is reasonable
+ // if not
+ // 3a. Fix the parameters 3 and 4 with the results of a simple least
+ // square fit
+ // 3b. Redo the fit with the fixed parameters
+ // 4. Store fit results (parameters and errors)
+ //
+ if(!fTrackFitter){
+ return 1e10;
+ }
+ fXref = CalculateReferenceX();
+ for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) UpdateFitters(fTracklets[il]);
+ if(!fTrackFitter->GetNpoints()) return 1e10;
+ // perform the fit
+ fTrackFitter->Eval();
+ fZfitter->Eval();
+ fParameters[3] = fTrackFitter->GetParameter(3);
+ fParameters[4] = fTrackFitter->GetParameter(4);
+ if(!CheckAcceptable(fParameters[3], fParameters[4])) {
+ fTrackFitter->FixParameter(3, fZfitter->GetFunctionValue(&fXref));
+ fTrackFitter->FixParameter(4, fZfitter->GetFunctionParameter(1));
+ fTrackFitter->Eval();
+ fTrackFitter->ReleaseParameter(3);
+ fTrackFitter->ReleaseParameter(4);
+ fParameters[3] = fTrackFitter->GetParameter(3);
+ fParameters[4] = fTrackFitter->GetParameter(4);
+ }
+ // Update the Fit Parameters and the errors
+ fParameters[0] = fTrackFitter->GetParameter(0);
+ fParameters[1] = fTrackFitter->GetParameter(1);
+ fParameters[2] = fTrackFitter->GetParameter(2);
+
+ // Prepare Covariance estimation
+ (*fCovarPolY)(0,0) = fSumPolY[0]; (*fCovarPolY)(1,1) = fSumPolY[2]; (*fCovarPolY)(2,2) = fSumPolY[4];
+ (*fCovarPolY)(1,0) = (*fCovarPolY)(0,1) = fSumPolY[1];
+ (*fCovarPolY)(2,0) = (*fCovarPolY)(0,2) = fSumPolY[2];
+ (*fCovarPolY)(2,1) = (*fCovarPolY)(1,2) = fSumPolY[3];
+ fCovarPolY->Invert();
+ (*fCovarPolZ)(0,0) = fSumPolZ[0]; (*fCovarPolZ)(1,1) = fSumPolZ[2];
+ (*fCovarPolZ)(1,0) = (*fCovarPolZ)(0,1) = fSumPolZ[1];
+ fCovarPolZ->Invert();
+ return fTrackFitter->GetChisquare() / fTrackFitter->GetNpoints();
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDtrackFitterRieman::UpdateFitters(AliTRDseedV1 *tracklet){
+ //
+ // Does the transformations and updates the fitters
+ // The following transformation is applied
+ //
+ AliTRDcluster *cl = NULL;
+ Double_t x, y, z, dx, t, w, we, yerr, zerr;
+ Double_t uvt[4];
+ if(!tracklet || !tracklet->IsOK()) return;
+ Double_t tilt = tracklet->GetTilt();
+ for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){
+ if(!(cl = tracklet->GetClusters(itb))) continue;
+ if(!cl->IsInChamber()) continue;
+ if (!tracklet->IsUsable(itb)) continue;
+ x = cl->GetX();
+ y = cl->GetY();
+ z = cl->GetZ();
+ dx = x - fXref;
+ // Transformation
+ t = 1./(x*x + y*y);
+ uvt[0] = 2. * x * t;
+ uvt[1] = t;
+ uvt[2] = 2. * tilt * t;
+ uvt[3] = 2. * tilt * dx * t;
+ w = 2. * (y + tilt*z) * t;
+ // error definition changes for the different calls
+ we = 2. * t;
+ we *= TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2());
+ // Update sums for error calculation
+ yerr = 1./(TMath::Sqrt(cl->GetSigmaY2()) + fSysClusterError);
+ yerr *= yerr;
+ zerr = 1./cl->GetSigmaZ2();
+ for(Int_t ipol = 0; ipol < 5; ipol++){
+ fSumPolY[ipol] += yerr;
+ yerr *= x;
+ if(ipol < 3){
+ fSumPolZ[ipol] += zerr;
+ zerr *= x;
+ }
+ }
+ fTrackFitter->AddPoint(uvt, w, we);
+ fZfitter->AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
+ }
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CheckAcceptable(Double_t offset, Double_t slope){
+ //
+ // Check whether z-results are acceptable
+ // Definition: Distance between tracklet fit and track fit has to be
+ // less then half a padlength
+ // Point of comparision is at the anode wire
+ //
+ Bool_t acceptablez = kTRUE;
+ Double_t zref = 0.0;
+ for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
+ if(!fTracklets[iLayer]->IsOK()) continue;
+ zref = offset + slope * (fTracklets[iLayer]->GetX0() - fXref);
+ if (TMath::Abs(fTracklets[iLayer]->GetZfit(0) - zref) > fTracklets[iLayer]->GetPadLength() * 0.5 + 1.0)
+ acceptablez = kFALSE;
+ }
+ return acceptablez;
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetYat(Double_t x) const {
+ //
+ // Calculate y position out of the track parameters
+ // y: R^2 = (x - x0)^2 + (y - y0)^2
+ // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
+ // R = Sqrt() = 1/Curvature
+ // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
+ //
+ Double_t y = 0;
+ Double_t disc = (x * fParameters[0] + fParameters[1]);
+ disc = 1 - fParameters[0]*fParameters[2] + fParameters[1]*fParameters[1] - disc*disc;
+ if (disc >= 0) {
+ disc = TMath::Sqrt(disc);
+ y = (1.0 - disc) / fParameters[0];
+ }
+ return y;
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetZat(Double_t x) const {
+ //
+ // Return z position for a given x position
+ // Simple linear function
+ //
+ return fParameters[3] + fParameters[4] * (x - fXref);
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetDyDxAt(Double_t x) const {
+ //
+ // Calculate dydx at a given radial position out of the track parameters
+ // dy: R^2 = (x - x0)^2 + (y - y0)^2
+ // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
+ // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
+ // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
+ // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
+ //
+ Double_t x0 = -fParameters[1] / fParameters[0];
+ Double_t curvature = GetCurvature();
+ Double_t dy = 0;
+ if (-fParameters[2] * fParameters[0] + fParameters[1] * fParameters[1] + 1 > 0) {
+ if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
+ Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
+ if (fParameters[0] < 0) yderiv *= -1.0;
+ dy = yderiv;
+ }
+ }
+ return dy;
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCurvature() const {
+ //
+ // Calculate track curvature
+ //
+ //
+ Double_t curvature = 1.0 + fParameters[1]*fParameters[1] - fParameters[2]*fParameters[0];
+ if (curvature > 0.0)
+ curvature = fParameters[0] / TMath::Sqrt(curvature);
+ return curvature;
+}
+
+//_____________________________________________________________________________
+void AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCovAt(Double_t x, Double_t *cov) const {
+ //
+ // Error Definition according to gauss error propagation
+ //
+ TMatrixD transform(3,3);
+ transform(0,0) = transform(1,1) = transform(2,2) = 1;
+ transform(0,1) = transform(1,2) = x;
+ transform(0,2) = x*x;
+ TMatrixD covariance(transform, TMatrixD::kMult, *fCovarPolY);
+ covariance *= transform.T();
+ cov[0] = covariance(0,0);
+ TMatrixD transformZ(2,2);
+ transformZ(0,0) = transformZ(1,1) = 1;
+ transformZ(0,1) = x;
+ TMatrixD covarZ(transformZ, TMatrixD::kMult, *fCovarPolZ);
+ covarZ *= transformZ.T();
+ cov[1] = covarZ(0,0);
+ cov[2] = 0;
+}
+
+//____________________________________________________________________
+Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CalculateReferenceX(){
+ //
+ // Calculates the reference x-position for the tilted Rieman fit defined as middle
+ // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
+ // are taken into account
+ //
+ // Parameters: - Array of tracklets(AliTRDseedV1)
+ //
+ // Output: - The reference x-position(Float_t)
+ //
+ Int_t nDistances = 0;
+ Float_t meanDistance = 0.;
+ Int_t startIndex = 5;
+ for(Int_t il =5; il > 0; il--){
+ if(fTracklets[il]->IsOK() && fTracklets[il -1]->IsOK()){
+ Float_t xdiff = fTracklets[il]->GetX0() - fTracklets[il -1]->GetX0();
+ meanDistance += xdiff;
+ nDistances++;
+ }
+ if(fTracklets[il]->IsOK()) startIndex = il;
+ }
+ if(fTracklets[0]->IsOK()) startIndex = 0;
+ if(!nDistances){
+ // We should normally never get here
+ Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
+ Int_t iok = 0, idiff = 0;
+ // This attempt is worse and should be avoided:
+ // check for two chambers which are OK and repeat this without taking the mean value
+ // Strategy avoids a division by 0;
+ for(Int_t il = 5; il >= 0; il--){
+ if(fTracklets[il]->IsOK()){
+ xpos[iok] = fTracklets[il]->GetX0();
+ iok++;
+ startIndex = il;
+ }
+ if(iok) idiff++; // to get the right difference;
+ if(iok > 1) break;
+ }
+ if(iok > 1){
+ meanDistance = (xpos[0] - xpos[1])/idiff;
+ }
+ else{
+ // we have do not even have 2 layers which are OK? The we do not need to fit at all
+ return 331.;
+ }
+ }
+ else{
+ meanDistance /= nDistances;
+ }
+ return fTracklets[startIndex]->GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff