+++ /dev/null
-/**************************************************************************
-* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
-* *
-* Author: The ALICE Off-line Project. *
-* Contributors are mentioned in the code where appropriate. *
-* *
-* Permission to use, copy, modify and distribute this software and its *
-* documentation strictly for non-commercial purposes is hereby granted *
-* without fee, provided that the above copyright notice appears in all *
-* copies and that both the copyright notice and this permission notice *
-* appear in the supporting documentation. The authors make no claims *
-* about the suitability of this software for any purpose. It is *
-* provided "as is" without express or implied warranty. *
-**************************************************************************/
-
-/* $Id$ */
-
-///////////////////////////////////////////////////////////////////////////////
-// //
-// Track finder //
-// //
-// Authors: //
-// Alex Bercuci <A.Bercuci@gsi.de> //
-// Markus Fasel <M.Fasel@gsi.de> //
-// //
-///////////////////////////////////////////////////////////////////////////////
-
-#include <TBranch.h>
-#include <TDirectory.h>
-#include <TLinearFitter.h>
-#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"
-#include "AliTrackPointArray.h"
-
-#include "AliTRDgeometry.h"
-#include "AliTRDpadPlane.h"
-#include "AliTRDcalibDB.h"
-#include "AliTRDReconstructor.h"
-#include "AliTRDCalibraFillHisto.h"
-#include "AliTRDrecoParam.h"
-
-#include "AliTRDcluster.h"
-#include "AliTRDdigitsParam.h"
-#include "AliTRDseedV1.h"
-#include "AliTRDtrackV1.h"
-#include "AliTRDtrackerV1.h"
-#include "AliTRDtrackerDebug.h"
-#include "AliTRDtrackingChamber.h"
-#include "AliTRDchamberTimeBin.h"
-
-ClassImp(AliTRDtrackerV1)
-ClassImp(AliTRDtrackerV1::AliTRDLeastSquare)
-ClassImp(AliTRDtrackerV1::AliTRDtrackFitterRieman)
-
-AliTRDtrackerV1::ETRDtrackerV1BetheBloch AliTRDtrackerV1::fgBB = AliTRDtrackerV1::kGeant;
-Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
- 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};
-// Number of Time Bins/chamber should be also stored independently by the traker
-// (also in AliTRDReconstructor) in oder to be able to run HLT. Fix TODO
-Int_t AliTRDtrackerV1::fgNTimeBins = 0;
-AliRieman* AliTRDtrackerV1::fgRieman = NULL;
-TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL;
-TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL;
-
-//____________________________________________________________________
-AliTRDtrackerV1::AliTRDtrackerV1(const AliTRDReconstructor *rec)
- :AliTracker()
- ,fkReconstructor(NULL)
- ,fkRecoParam(NULL)
- ,fGeom(NULL)
- ,fClusters(NULL)
- ,fTracklets(NULL)
- ,fTracks(NULL)
- ,fTracksESD(NULL)
- ,fSieveSeeding(0)
- ,fEventInFile(-1)
-{
- //
- // Default constructor.
- //
-
- SetReconstructor(rec); // initialize reconstructor
-
- // initialize geometry
- if(!AliGeomManager::GetGeometry()){
- AliFatal("Could not get geometry.");
- }
- fGeom = new AliTRDgeometry();
- fGeom->CreateClusterMatrixArray();
- TGeoHMatrix *matrix = NULL;
- 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 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*));
- fTracksESD = new TClonesArray("AliESDtrack", 2*kMaxTracksStack);
- fTracksESD->SetOwner();
-}
-
-//____________________________________________________________________
-AliTRDtrackerV1::~AliTRDtrackerV1()
-{
- //
- // Destructor
- //
-
- if(fgRieman) delete fgRieman; fgRieman = NULL;
- if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL;
- if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL;
- for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
- if(fTracksESD){ fTracksESD->Delete(); delete fTracksESD; }
- if(fTracks) {fTracks->Delete(); delete fTracks;}
- if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
- if(IsClustersOwner() && fClusters) {
- AliInfo(Form("tracker[%p] removing %d own clusters @ %p", (void*)this, fClusters->GetEntries(), (void*)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(!fkRecoParam){
- 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 tracks: !TRDin[%d]", ntracks));
- return ntracks;
-}
-
-
-//_____________________________________________________________________________
-Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
-{
- //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;
-}
-
-//____________________________________________________________________
-TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
-{
- if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
- return fgTiltedRiemanConstrained;
-}
-
-//____________________________________________________________________
-AliRieman* AliTRDtrackerV1::GetRiemanFitter()
-{
- if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer);
- return fgRieman;
-}
-
-//_____________________________________________________________________________
-Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
-{
-// 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.
-//
-
- if(!fClusters || !fClusters->GetEntriesFast()){
- AliInfo("No TRD clusters");
- return 0;
- }
- AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor
- if (!calibra) AliInfo("Could not get Calibra instance");
- if (!fgNTimeBins) fgNTimeBins = fkReconstructor->GetNTimeBins();
-
- // Define scalers
- Int_t nFound = 0, // number of tracks found
- nBacked = 0, // number of tracks backed up for refit
- 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 = NULL;
- Int_t *index = NULL;
- fEventInFile = event->GetEventNumberInFile();
- nSeeds = event->GetNumberOfTracks();
- // Sort tracks according to quality
- // (covariance in the yz plane)
- if(nSeeds){
- quality = new Float_t[nSeeds];
- index = new Int_t[4*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::kTRDout) != 0) continue;
- if ((status & AliESDtrack::kTPCout)){
- AliDebug(3, Form("Prolongate seed[%2d] which is TPC.", iSeed));
- // set steering parameters for TPC
- //fkRecoParam->SetTrackParam(kTPC);
-/* } else {
- if ((status & AliESDtrack::kITSout)){
- AliDebug(3, Form("Prolongate seed[%2d] which is ITS.", iSeed));
- // set steering parameters for ITS
- //fkRecoParam->SetTrackParam(kITS);
- // rotate
- Float_t globalToTracking = AliTRDgeometry::GetAlpha()*(Int_t(seed->GetAlpha()/AliTRDgeometry::GetAlpha()) + (seed->GetAlpha()>0. ? 0.5 : -0.5));
- if(!seed->Rotate(globalToTracking)) continue;
- } else continue;*/
- } else continue;
-
- // Propagate to the entrance in the TRD mother volume
- track.~AliTRDtrackV1();
- new(&track) AliTRDtrackV1(*seed);
- if(AliTRDgeometry::GetXtrdBeg() > (AliTRDReconstructor::GetMaxStep() + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), AliTRDReconstructor::GetMaxStep())){
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
- continue;
- }
- if(!AdjustSector(&track)){
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
- continue;
- }
- if(TMath::Abs(track.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
- continue;
- }
- nTPCseeds++;
- AliDebug(2, Form("TRD propagate TPC seed[%d] = %d.", iSeed, index[iSeed]));
- // store track status at TRD entrance
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
-
- // prepare track and do propagation in the TRD
- track.SetReconstructor(fkReconstructor);
- track.SetKink(Bool_t(seed->GetKinkIndex(0)));
- track.SetPrimary(status & AliESDtrack::kTPCin);
- expectedClr = FollowBackProlongation(track);
- // check if track entered the TRD fiducial volume
- if(track.GetTrackIn()){
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
- nTRDseeds++;
- }
- // check if track was stopped in the TRD
- if (expectedClr<0){
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
- continue;
- } else {
- nFound++;
- // compute PID
- track.CookPID();
- //compute MC label
- track.CookLabel(1. - AliTRDReconstructor::GetLabelFraction());
- // update calibration references using this track
- if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
- // save calibration object
- if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0 || AliTRDReconstructor::GetStreamLevel()>0 ) {
- AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
- calibTrack->SetOwner();
- seed->AddCalibObject(calibTrack);
- }
- //update ESD track
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
- track.UpdateESDtrack(seed);
- }
-
- // Make backup for back propagation
- if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) || (track.Pt() > 0.8)) {
- Int_t foundClr = track.GetNumberOfClusters();
- if (foundClr >= foundMin) {
- //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);
- nBacked++;
- 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);
- nBacked++;
- 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);
- nBacked++;
- 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 = NULL;
- 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 > (AliTRDReconstructor::GetMaxStep() + track.GetX()) && !PropagateToX(track, xtof, AliTRDReconstructor::GetMaxStep())){
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
- continue;
- }
- if(!AdjustSector(&track)){
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop);
- continue;
- }
- if(TMath::Abs(track.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){
- 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] TRDbackup[%d]", nFound, nBacked));
-
- // run stand alone tracking
- if (fkReconstructor->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
-
-
- if(!fClusters || !fClusters->GetEntriesFast()){
- AliInfo("No TRD clusters");
- return 0;
- }
- AliTRDtrackV1 track;
- for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
- AliESDtrack *seed = event->GetTrack(itrack);
- ULong_t status = seed->GetStatus();
-
- 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
- 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)){
- // Update the friend track
- if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0 || AliTRDReconstructor::GetStreamLevel()>0 ){
- TObject *o = NULL; Int_t ic = 0;
- AliTRDtrackV1 *calibTrack = NULL;
- while((o = seed->GetCalibObject(ic++))){
- if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
- calibTrack->SetTrackOut(&track);
- }
- }
-
- // Prolongate to TPC
- if (PropagateToX(track, xTPC, AliTRDReconstructor::GetMaxStep())) { // -with update
- seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
- found++;
- kUPDATE = kTRUE;
- }
- }
-
- // Prolongate to TPC without update
- if(!kUPDATE) {
- AliTRDtrackV1 tt(*seed);
- if (PropagateToX(tt, xTPC, AliTRDReconstructor::GetMaxStep())) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup);
- }
- }
- AliInfo(Form("Number of seeds: TRDout[%d]", nseed));
- AliInfo(Form("Number of tracks: TRDrefit[%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;
- for (Int_t iplane = kNPlanes; iplane--;) {
- Int_t index(-1);
- AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
- AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index));
- if(!tracklet) continue;
- if(!tracklet->IsOK()){
- AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector()));
- continue;
- }
- Double_t x = tracklet->GetX();//GetX0();
- // reject tracklets which are not considered for inward refit
- if(x > t.GetX()+AliTRDReconstructor::GetMaxStep()) continue;
-
- // append tracklet to track
- t.SetTracklet(tracklet, index);
-
- if (x < (t.GetX()-AliTRDReconstructor::GetMaxStep()) && !PropagateToX(t, x+AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) 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;
- }
-
- 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(fkReconstructor->IsDebugStreaming()){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
- AliExternalTrackParam param0(t);
- AliExternalTrackParam param1(t);
- param1.Update(p, cov);
- TVectorD vcov(3,cov);
- TVectorD vpar(3,p);
- cstreamer << "FollowProlongationInfo"
- << "EventNumber=" << eventNumber
- << "iplane="<<iplane
- << "vcov.="<<&vcov
- << "vpar.="<<&vpar
- << "tracklet.=" << tracklet
- << "chi2="<< chi2
- << "param0.=" << ¶m0
- << "param1.=" << ¶m1
- << "\n";
- }
- /*
- AliInfo(Form("Pl:%d X:%+e : %+e P: %+e %+e Cov:%+e %+e %+e -> dXY: %+e %+e | chi2:%.2f pT:%.2f alp:%.3f",
- iplane,x,t.GetX(),p[0],p[1],cov[0],cov[1],cov[2],
- p[0]-t.GetY(),p[1]-t.GetZ(),
- chi2,t.Pt()*t.Charge(),t.GetAlpha()));
- */
- if (chi2 < fkRecoParam->GetChi2Cut() && ((AliExternalTrackParam&)t).Update(p, cov)){ // MI parameterizad chi2 cut 03.05.2014
- // if (chi2 < 1e+10 && ((AliExternalTrackParam&)t).Update(p, cov)){
- // Register info to track
- t.SetNumberOfClusters();
- t.UpdateChi2(chi2);
- nClustersExpected += tracklet->GetN();
- }
- }
-
- if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 || AliTRDReconstructor::GetStreamLevel()>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);
- }
-
- if(fkReconstructor->IsDebugStreaming()){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
- AliTRDtrackV1 track(t);
- track.SetOwner();
- cstreamer << "FollowProlongation"
- << "EventNumber=" << eventNumber
- << "ncl=" << nClustersExpected
- << "track.=" << &track
- << "\n";
- }
- }
- return nClustersExpected;
-
-}
-
-//_____________________________________________________________________________
-Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
-{
-// 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 = NULL;
-
- Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0;
- if ( AliTRDReconstructor::GetStreamLevel()>0) debugLevel= AliTRDReconstructor::GetStreamLevel();
- TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0;
-
- Bool_t kStoreIn(kTRUE), // toggel store track params. at TRD entry
- kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding
- kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman
-
- Int_t startLayer(0);
- AliTRDseedV1 tracklet, *ptrTracklet = NULL;
- // Special case for stand alone tracking
- // - store all tracklets found by seeding
- // - start propagation from first tracklet found
- AliTRDseedV1 *tracklets[kNPlanes];
- memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
- for(Int_t ip(kNPlanes); ip--;){
- if(!(tracklets[ip] = t.GetTracklet(ip))) continue;
- t.UnsetTracklet(ip);
- if(tracklets[ip]->IsOK()) startLayer=ip;
- kStandAlone = kTRUE;
- kUseTRD = kTRUE;
- }
- AliDebug(4, Form("SA[%c] Start[%d]\n"
- " [0]idx[%d] traklet[%p]\n"
- " [1]idx[%d] traklet[%p]\n"
- " [2]idx[%d] traklet[%p]\n"
- " [3]idx[%d] traklet[%p]\n"
- " [4]idx[%d] traklet[%p]\n"
- " [5]idx[%d] traklet[%p]"
- , kStandAlone?'y':'n', startLayer
- , t.GetTrackletIndex(0), (void*)tracklets[0]
- , t.GetTrackletIndex(1), (void*)tracklets[1]
- , t.GetTrackletIndex(2), (void*)tracklets[2]
- , t.GetTrackletIndex(3), (void*)tracklets[3]
- , t.GetTrackletIndex(4), (void*)tracklets[4]
- , t.GetTrackletIndex(5), (void*)tracklets[5]));
-
- // Loop through the TRD layers
- TGeoHMatrix *matrix = NULL;
- Double_t x(0.), y(0.), z(0.);
- for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) {
- AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily]));
-
- // rough estimate of the entry point
- if (!t.GetProlongation(fR[ily], y, z)){
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kProlongation);
- AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z));
- 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) : NULL;
-
- // check if supermodule/chamber is installed
- if( !fGeom->GetSMstatus(sm) ||
- stk<0. ||
- fGeom->IsHole(ily, stk, sm) ||
- !matrix ){
- AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily));
- // propagate to the default radial position
- if(fR[ily] > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, fR[ily], AliTRDReconstructor::GetMaxStep())){
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kPropagation);
- AliDebug(4, "Failed Propagation [Missing Geometry]");
- break;
- }
- if(!AdjustSector(&t)){
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kAdjustSector);
- AliDebug(4, "Failed Adjust Sector [Missing Geometry]");
- break;
- }
- if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kSnp);
- AliDebug(4, "Failed Max Snp [Missing Geometry]");
- break;
- }
- t.SetErrStat(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);
- AliDebug(3, Form("Propagate to det[%3d] x_anode[%7.2f] (%f %f)", det, glb[0]+driftLength, glb[1], glb[2]));
-
- // Propagate to the radial distance of the current layer
- x = glb[0] - AliTRDReconstructor::GetMaxStep();
- if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())){
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kPropagation);
- AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x));
- break;
- }
- if(!AdjustSector(&t)){
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kAdjustSector);
- AliDebug(4, "Failed Adjust Sector Start");
- break;
- }
- if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kSnp);
- AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
- break;
- }
- Bool_t doRecalculate = kFALSE;
- if(sm != t.GetSector()){
- sm = t.GetSector();
- doRecalculate = kTRUE;
- }
- if(stk != fGeom->GetStack(z, ily)){
- stk = fGeom->GetStack(z, ily);
- doRecalculate = kTRUE;
- }
- if(doRecalculate){
- det = AliTRDgeometry::GetDetector(ily, stk, sm);
- if(!(matrix = fGeom->GetClusterMatrix(det))){
- t.SetErrStat(AliTRDtrackV1::kGeometry, ily);
- AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily));
- continue;
- }
- matrix->LocalToMaster(loc, glb);
- x = glb[0] - AliTRDReconstructor::GetMaxStep();
- }
-
- // check if track is well inside fiducial volume
- if (!t.GetProlongation(x+AliTRDReconstructor::GetMaxStep(), y, z)) {
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kProlongation);
- AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+AliTRDReconstructor::GetMaxStep(), y, z));
- break;
- }
- if(fGeom->IsOnBoundary(det, y, z, .5)){
- t.SetErrStat(AliTRDtrackV1::kBoundary, ily);
- AliDebug(4, "Failed Track on Boundary");
- continue;
- }
-
- Float_t prod(t.GetBz()*t.Charge());
- ptrTracklet = tracklets[ily];
- if(!ptrTracklet){ // BUILD TRACKLET
- AliDebug(3, Form("Building tracklet det[%d]", det));
- // check data in supermodule
- if(!fTrSec[sm].GetNChambers()){
- t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
- AliDebug(4, "Failed NoClusters");
- continue;
- }
- if(fTrSec[sm].GetX(ily) < 1.){
- t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
- AliDebug(4, "Failed NoX");
- continue;
- }
-
- // check data in chamber
- if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){
- t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
- AliDebug(4, "Failed No Detector");
- continue;
- }
- if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){
- t.SetErrStat(AliTRDtrackV1::kNoClusters, ily);
- AliDebug(4, "Failed Not Enough Clusters in Detector");
- continue;
- }
- // build tracklet
- tracklet.~AliTRDseedV1();
- ptrTracklet = new(&tracklet) AliTRDseedV1(det);
- ptrTracklet->SetReconstructor(fkReconstructor);
- ptrTracklet->SetKink(t.IsKink());
- ptrTracklet->SetPrimary(t.IsPrimary());
- ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk));
- //set first approximation of radial position of anode wire corresponding to middle chamber y=0, z=0
- // the uncertainty is given by the actual position of the tracklet (y,z) and chamber inclination
- ptrTracklet->SetX0(glb[0]+driftLength);
- if(!ptrTracklet->Init(&t)){
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kTrackletInit);
- AliDebug(4, "Failed Tracklet Init");
- break;
- }
- // Select attachment base on track to B field sign not only track charge which is buggy
- // mark kFALSE same sign tracks and kTRUE opposite sign tracks
- // A.Bercuci 3.11.2011
- if(!ptrTracklet->AttachClusters(chamber, kTRUE, prod<0.?kTRUE:kFALSE, fEventInFile)){
- t.SetErrStat(AliTRDtrackV1::kNoAttach, ily);
- if(debugLevel>3){
- AliTRDseedV1 trackletCp(*ptrTracklet);
- UChar_t status(t.GetStatusTRD(ily));
- (*cstreamer) << "FollowBackProlongation4"
- <<"status=" << status
- <<"tracklet.=" << &trackletCp
- << "\n";
- }
- AliDebug(4, "Failed Attach Clusters");
- continue;
- }
- AliDebug(3, Form("Number of Clusters in Tracklet: %d", ptrTracklet->GetN()));
- if(ptrTracklet->GetN() < fgNTimeBins*fkRecoParam->GetFindableClusters()){
- t.SetErrStat(AliTRDtrackV1::kNoClustersTracklet, ily);
- if(debugLevel>3){
- AliTRDseedV1 trackletCp(*ptrTracklet);
- UChar_t status(t.GetStatusTRD(ily));
- (*cstreamer) << "FollowBackProlongation4"
- <<"status=" << status
- <<"tracklet.=" << &trackletCp
- << "\n";
- }
- AliDebug(4, "Failed N Clusters Attached");
- continue;
- }
- ptrTracklet->UpdateUsed();
- } else AliDebug(2, Form("Use external tracklet ly[%d]", ily));
- // propagate track to the radial position of the tracklet
-
- // fit tracklet in the local chamber coordinate system
- // tilt correction options
- // 0 : no correction
- // 2 : pseudo tilt correction
- if(!ptrTracklet->FitRobust(fGeom->GetPadPlane(ily, stk), matrix, t.GetBz(), t.Charge())){
- t.SetErrStat(AliTRDtrackV1::kNoFit, ily);
- AliDebug(4, "Failed Tracklet Fit");
- continue;
- }
- // Calculate tracklet position in tracking coordinates
- // A.Bercuci 27.11.2013
- ptrTracklet->SetXYZ(matrix);
-
- x = ptrTracklet->GetX(); //GetX0();
- if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())) {
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kPropagation);
- AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x));
- break;
- }
- if(!AdjustSector(&t)) {
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kAdjustSector);
- AliDebug(4, "Failed Adjust Sector");
- break;
- }
- if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) {
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kSnp);
- AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp()));
- break;
- }
- Double_t cov[3]; ptrTracklet->GetCovAt(x, cov);
- Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()};
- Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov);
- /*
- AliInfo(Form("Pl:%d X:%+e : %+e P: %+e %+e Cov:%+e %+e %+e -> dXY: %+e %+e | chi2:%.2f pT:%.2f alp:%.3f",
- ily,x,t.GetX(),p[0],p[1],cov[0],cov[1],cov[2],
- p[0]-t.GetY(),p[1]-t.GetZ(),
- chi2,t.Pt()*t.Charge(),t.GetAlpha()));
- */
-
- if(fkReconstructor->IsDebugStreaming()){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- // TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
- AliExternalTrackParam param0(t);
- AliExternalTrackParam param1(t);
- param1.Update(p, cov);
- TVectorD vcov(3,cov);
- TVectorD vpar(3,p);
- (*cstreamer) << "FollowBackProlongationInfo"
- << "EventNumber=" << eventNumber
- << "chi2="<<chi2
- << "iplane="<<ily
- << "vcov.="<<&vcov
- << "vpar.="<<&vpar
- << "tracklet.=" << ptrTracklet
- << "param0.=" << ¶m0
- << "param1.=" << ¶m1
- << "\n";
- }
-
- // update Kalman with the TRD measurement
- if (chi2> fkRecoParam->GetChi2Cut()){ // MI parameterizad chi2 cut 03.05.2014
- t.SetErrStat(AliTRDtrackV1::kChi2, ily);
- if(debugLevel > 2){
- UChar_t status(t.GetStatusTRD());
- AliTRDseedV1 trackletCp(*ptrTracklet);
- AliTRDtrackV1 trackCp(t);
- trackCp.SetOwner();
- (*cstreamer) << "FollowBackProlongation3"
- << "status=" << status
- << "tracklet.=" << &trackletCp
- << "track.=" << &trackCp
- << "\n";
- }
- AliDebug(4, Form("Failed Chi2[%f]", chi2));
- continue;
- }
- // mark track as entering the FIDUCIAL volume of TRD
- if(kStoreIn){
- t.SetTrackIn();
- kStoreIn = kFALSE;
- }
- if(kUseTRD){
- if(!((AliExternalTrackParam&)t).Update(p, cov)) {
- n=-1;
- t.SetErrStat(AliTRDtrackV1::kUpdate);
- if(debugLevel > 2){
- UChar_t status(t.GetStatusTRD());
- AliTRDseedV1 trackletCp(*ptrTracklet);
- AliTRDtrackV1 trackCp(t);
- trackCp.SetOwner();
- (*cstreamer) << "FollowBackProlongation3"
- << "status=" << status
- << "tracklet.=" << &trackletCp
- << "track.=" << &trackCp
- << "\n";
- }
- AliDebug(4, Form("Failed Track Update @ y[%7.2f] z[%7.2f] s2y[%f] s2z[%f] covyz[%f]", p[0], p[1], cov[0], cov[2], cov[1]));
- break;
- }
- }
- if(!kStandAlone) ptrTracklet->UseClusters();
- // fill residuals ?!
- AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId());
-
-
- // register tracklet with the tracker and track
- // Save inside the tracklet the track parameters BEFORE track update.
- // Commented out their overwriting AFTER track update
- // A.Bercuci 3.11.2011
- //ptrTracklet->Update(&t);
- ptrTracklet = SetTracklet(ptrTracklet);
- Int_t index(fTracklets->GetEntriesFast()-1);
- t.SetTracklet(ptrTracklet, index);
- // Register info to track
- t.SetNumberOfClusters();
- t.UpdateChi2(chi2);
-
- n += ptrTracklet->GetN();
- AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index));
-
- // 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
- Int_t failed(0);
- if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed));
-
- } // 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(n && debugLevel > 1){
- //Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- AliTRDtrackV1 track(t);
- track.SetOwner();
- (*cstreamer) << "FollowBackProlongation2"
- << "EventNumber=" << fEventInFile
- << "track.=" << &track
- << "\n";
- }
-
- return n;
-}
-
-//_________________________________________________________________________
-Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const 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]].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()));
- }
-}
-
-
-//_________________________________________________________________________
-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 = NULL;
-
- 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;
- if(!(cl = tracklets[ilr].GetClusters(itb))) continue;
- 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 = 0.0;
- if (nPoints > 0) {
- chi2track = fitter->GetChisquare()/Double_t(nPoints);
- }
- for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
- tracklets[ip].SetC(curvature, 1);
-
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRiemanConstraint: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
-
-/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 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 = *fkReconstructor->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 = NULL;
-
- 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++;
- }
- }
- if (fitter->Eval()) return 1.e10;
- 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 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(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRieman: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature);
-
-/* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){
- TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::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;
-}
-
-
-//____________________________________________________________________
-Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
-{
- //
- // Fit track with a staight line
- // Fills an AliTrackPoint array with np points
- // Function should be used to refit tracks when no magnetic field was on
- //
- AliTRDLeastSquare yfitter, zfitter;
- AliTRDcluster *cl = NULL;
-
- AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
- 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 = NULL;
-
- AliTRDseedV1 work[kNPlanes], *tracklet = NULL;
- 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);
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitRiemanTilt:\nx0[(0)%6.2f (1)%6.2f (2)%6.2f (3)%6.2f (4)%6.2f (5)%6.2f] xref[%6.2f]", tracklets[0].GetX0(), tracklets[1].GetX0(), tracklets[2].GetX0(), tracklets[3].GetX0(), tracklets[4].GetX0(), tracklets[5].GetX0(), xref);
- 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 radius = TMath::Sqrt(tmp);
- Double_t curvature = 1.0 + b*b - c*a;
- if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature);
-
- // Calculate chi2 of the fit
- Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitRiemanTilt:x0[%6.2f] y0[%6.2f] R[%6.2f] chi2[%f]\n", x0, y0, radius, chi2);
-
- // Update the tracklets
- if(!track){
- for(Int_t ip = 0; ip < kNPlanes; ip++) {
- x = tracklets[ip].GetX0();
- tmp = radius*radius-(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(curvature);
- 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) > radius ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((radius-(xyz[0]-x0))*(radius+(xyz[0]-x0)));
- xyz[2] = z0 + dzdx * (xyz[0] - xref);
- points[ip].SetXYZ(xyz);
- }
- }
-
- return chi2;
-}
-
-
-//____________________________________________________________________
-Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const 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;
- AliTRDseedV1 *ptrTracklet = NULL;
-
- //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 = NULL;
- if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam: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) - AliTRDReconstructor::GetMaxStep() < 0) break;
- if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) 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()) + AliTRDReconstructor::GetMaxStep() < 0) && !PropagateToX(*track, x + (up?-1:1)*AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) return -1.;
-
- if(!AdjustSector(track)) return -1;
- if(TMath::Abs(track->GetSnp()) > AliTRDReconstructor::GetMaxSnp()) 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(TMath::Abs(xyz0[0] - xyz1[0]) < 1e-3 && TMath::Abs(xyz0[1] - xyz1[1]) < 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) ((AliExternalTrackParam*)track)->Update(p, cov);
- 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(), AliTRDReconstructor::GetMaxStep())) 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(const 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::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> in steps of <maxStep>.
- // Returns 1 if track reaches the plane, and 0 otherwise
- //
-
- // Current track X-position
- Double_t xpos = t.GetX()/*,
- mass = t.GetMass()*/;
-
- // Direction: inward or outward
- Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
-
- while (((xToGo - xpos) * dir) > AliTRDReconstructor::GetEpsilon()) {
-// printf("to go %f\n", (xToGo - xpos) * dir);
- 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);
-
- // Get the global position of the starting point
- t.GetXYZ(xyz0);
-
- // 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)<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;
-
- // 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;
-
-/* // Correct for mean material budget
- Double_t dEdx(0.),
- bg(TMath::Abs(t.GetP()/mass));
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3){
- const char *pn[] = {"rho", "x/X0", "<A>", "<Z>", "L", "<Z/A>", "Nb"};
- printf("D-AliTRDtrackerV1::PropagateTo(): x[%6.2f] bg[%6.2f]\n", xpos, bg);
- printf(" param :: %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e]\n"
- , pn[0], param[0]
- , pn[1], param[1]
- , pn[2], param[2]
- , pn[3], param[3]
- , pn[4], param[4]
- , pn[5], param[5]
- , pn[6], param[6]);
- }
- switch(fgBB){
- case kSolid:
- dEdx = AliExternalTrackParam::BetheBlochSolid(bg);
- break;
- case kGas:
- dEdx = AliExternalTrackParam::BetheBlochGas(bg);
- break;
- case kGeant:
- { // mean exitation energy (GeV)
- Double_t mee = ((param[3] < 13.) ? (12. * param[3] + 7.) : (9.76 * param[3] + 58.8 * TMath::Power(param[3],-0.19))) * 1.e-9;
- Double_t mZA = param[5]>1.e-5?param[5]:(param[3]/param[2]);
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3) printf("D-AliTRDtrackerV1::PropagateTo(): Mee[%e] <Z/A>[%e]\n", mee, mZA);
- // protect against failed calculation of rho in MeanMaterialBudget()
- dEdx = AliExternalTrackParam::BetheBlochGeant(bg, param[0]>1.e-6?param[0]:2.33, 0.2, 3., mee, mZA);
- }
- break;
- }
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=2) printf("D-AliTRDtrackerV1::PropagateTo(): dEdx(bg=%e, m=%e)= %e[GeV/cm]\n", bg, mass, dEdx);
- if (!t.CorrectForMeanMaterialdEdx(param[1], dir*param[0]*param[4], mass, dEdx)) return 0;
-*/
- // Rotate the track if necessary
- if(!AdjustSector(&t)) return 0;
-
- // New track X-position
- xpos = t.GetX();
-
- }
-
- return 1;
-
-}
-
-//_____________________________________________________________________________
-Bool_t AliTRDtrackerV1::ReadClusters(TTree *clusterTree)
-{
- //
- // 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 kFALSE;
- }
- branch->SetAddress(&clusterArray);
-
- if(!fClusters){
- Float_t nclusters = fkRecoParam->GetNClusters();
- if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
- fClusters = new TClonesArray("AliTRDcluster", Int_t(nclusters));
- fClusters->SetOwner(kTRUE);
- SetClustersOwner();
- AliInfo(Form("Tracker owning clusters @ %p", (void*)fClusters));
- }
-
- // Loop through all entries in the tree
- Int_t nEntries = (Int_t) clusterTree->GetEntries();
- Int_t nbytes = 0;
- Int_t ncl = 0;
- AliTRDcluster *c = NULL;
- 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 kTRUE;
-}
-
-//_____________________________________________________________________________
-Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
-{
- //
- // Fills clusters into TRD tracking sectors
- //
-
- fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
-
-// if(!fkReconstructor->IsWritingClusters()) AliInfo(Form("IsWritingClusters[%c]", fkReconstructor->IsWritingClusters()?'y':'n'));
- if(!(fClusters = AliTRDReconstructor::GetClusters())){
- AliWarning("Clusters unavailable from TRD reconstructor. Trying reading from tree ...");
- } else {
- if(!ReadClusters(cTree)) {
- AliError("Reading clusters from tree failed.");
- return 1;
- }
- }
-
- if(!fClusters || !fClusters->GetEntriesFast()){
- AliInfo("No TRD clusters");
- return 1;
- } else AliInfo(Form("Using :: clusters[%d] onl.tracklets[%d] onl.tracks[%d]",
- fClusters?fClusters->GetEntriesFast():0,
- AliTRDReconstructor::GetTracklets()?AliTRDReconstructor::GetTracklets()->GetEntriesFast():0,
- AliTRDReconstructor::GetTracks()?AliTRDReconstructor::GetTracks()->GetEntriesFast():0));
-
- BuildTrackingContainers();
-
- return 0;
-}
-
-//_____________________________________________________________________________
-Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters)
-{
- //
- // Fills clusters into TRD tracking sectors
- // Function for use in the HLT
-
- if(!clusters || !clusters->GetEntriesFast()){
- AliInfo("No TRD clusters");
- return 1;
- } else AliInfo(Form("Using :: external.clusters[%d]", clusters->GetEntriesFast()));
-
-
- fClusters = clusters;
-
- fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event
- BuildTrackingContainers();
-
- return 0;
-}
-
-
-//____________________________________________________________________
-Int_t AliTRDtrackerV1::BuildTrackingContainers()
-{
-// Building tracking containers for clusters
-
- Int_t nin(0), ncl(fClusters->GetEntriesFast());
- while (ncl--) {
- AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(ncl);
- if(c->IsInChamber()) nin++;
- if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG);
- 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, ncl);
- }
-
- for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
- if(!fTrSec[isector].GetNChambers()) continue;
- fTrSec[isector].Init(fkReconstructor);
- }
-
- return nin;
-}
-
-
-
-//____________________________________________________________________
-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 = NULL;}
- }
- if(fTracklets){
- fTracklets->Delete();
- if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;}
- }
- if(fClusters && IsClustersOwner()){
- AliInfo(Form("tracker[%p] clearing %d own clusters @ %p", (void*)this, fClusters->GetEntries(), (void*)fClusters));
- fClusters->Delete();
-//
-// // save clusters array in the reconstructor for further use.
-// if(!fkReconstructor->IsWritingClusters()){
-// AliTRDReconstructor::SetClusters(fClusters);
-// SetClustersOwner(kFALSE);
-// } else AliTRDReconstructor::SetClusters(NULL);
- }
-
- 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 = NULL;
-// for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){
-// if(!(tracklet = track->GetTracklet(ily))) continue;
-// AliTRDcluster *c = NULL;
-// for(Int_t ic=AliTRDseed::kNclusters; ic--;){
-// if(!(c=tracklet->GetClusters(ic))) continue;
-// c->Use();
-// }
-// }
-// }
-//
-
-//_____________________________________________________________________________
-Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const 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;
-
-}
-
-
-//____________________________________________________________________
-AliTRDseedV1* AliTRDtrackerV1::GetTracklet(const AliTRDtrackV1 *const 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) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
-
- return tracklet;
-}
-
-//____________________________________________________________________
-AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const 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::Nsector()*kMaxTracksStack);
- fTracklets->SetOwner(kTRUE);
- }
- Int_t nentries = fTracklets->GetEntriesFast();
- return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
-}
-
-//____________________________________________________________________
-AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const 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.
- //
-
- Int_t nTracks = 0;
- Int_t nChambers = 0;
- AliTRDtrackingChamber **stack = NULL, *chamber = NULL;
- 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 * fkRecoParam->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, fTracksESD);
- }
- if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks));
-
- for(int itrack=0; itrack<nTracks; itrack++){
- AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack)));
- Int_t id = esd->AddTrack(esdTrack);
-
- // set ESD id to stand alone TRD tracks
- if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0 || AliTRDReconstructor::GetStreamLevel()>0 ){
- esdTrack=esd->GetTrack(id);
- TObject *o(NULL); Int_t ic(0);
- AliTRDtrackV1 *calibTrack(NULL);
- while((o = esdTrack->GetCalibObject(ic++))){
- if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue;
- calibTrack->SetESDid(esdTrack->GetID());
- break;
- }
- }
- }
-
- // Reset Track and Candidate Number
- AliTRDtrackerDebug::SetCandidateNumber(0);
- AliTRDtrackerDebug::SetTrackNumber(0);
-
- // delete ESD tracks in the array
- fTracksESD->Delete();
- return nTracks;
-}
-
-//____________________________________________________________________
-Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const 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 = NULL;
- AliTRDtrackingChamber **ci = NULL;
- 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(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10 || AliTRDReconstructor::GetStreamLevel()>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<fkRecoParam->GetNumberOfSeedConfigs(); 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;
- }
- AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
- if(!ntracks) break;
-
- // Sort the seeds according to their quality
- Int_t sort[kMaxTracksStack+1];
- TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){
- AliDebug(3, "Track candidates classification:");
- for (Int_t it(0); it < ntracks; it++) {
- Int_t jt(sort[it]);
- printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]);
- }
- }
-
- // 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
- Int_t jSieve(0), rejectedCandidates(0);
- do{
- // Check track candidates
- rejectedCandidates=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;
- sseed[jseed].UpdateUsed();
- if(!sseed[jseed].IsOK()) continue;
- // check if primary candidate
- if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++;
- ncl += sseed[jseed].GetN();
- nused += sseed[jseed].GetNUsed();
- nlayers++;
- }
-
- // Filter duplicated tracks
- if (nused > 30){
- AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
- fakeTrack[trackIndex] = kTRUE;
- continue;
- }
- if (ncl>0 && Float_t(nused)/ncl >= .25){
- AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d] used/ncl[%f]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused, Float_t(nused)/ncl));
- fakeTrack[trackIndex] = kTRUE;
- continue;
- }
-
- AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused));
-
- // Classify tracks
- Bool_t skip = kFALSE;
- switch(jSieve){
- case 0: // select 6 tracklets primary tracks, good quality
- if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;}
- if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
- break;
-
- case 1: // select shorter primary tracks, good quality
- //if(findable<4){skip = kTRUE; break;}
- if(nlayers < findable){skip = kTRUE; break;}
- if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
- break;
-
- case 2: // select 6 tracklets secondary tracks
- if(nlayers < kNPlanes) { skip = kTRUE; break;}
- if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
- break;
-
- case 3: // select shorter tracks, good quality
- if (nlayers<4){skip = kTRUE; break;}
- if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
- break;
-
- case 4: // select anything with at least 4 tracklets
- if (nlayers<4){skip = kTRUE; break;}
- //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
- break;
- }
- if(skip){
- rejectedCandidates++;
- AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
- continue;
- } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused));
-
- signedTrack[trackIndex] = kTRUE;
-
- AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes];
- AliTRDtrackV1 *track = MakeTrack(lseed);
- if(!track){
- AliDebug(1, "Track building failed.");
- continue;
- } else {
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){
- Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
- AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector())));
- }
- }
-
- if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){
- //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 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::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]
- << "Ncl=" << ncl
- << "NLayers=" << nlayers
- << "Findable=" << findable
- << "NUsed=" << nused
- << "\n";
- }
-
-
- AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
- esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
- esdTrack->SetLabel(track->GetLabel());
- track->UpdateESDtrack(esdTrack);
- // write ESD-friends if neccessary
- if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0 || AliTRDReconstructor::GetStreamLevel()>0 ){
- AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
- calibTrack->SetOwner();
- esdTrack->AddCalibObject(calibTrack);
- }
- ntracks1++;
- AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
- }
-
- jSieve++;
- } while(jSieve<5 && rejectedCandidates); // end track candidates sieve
- if(!ntracks1) break;
-
- // increment counters
- ntracks2 += ntracks1;
-
- if(fkReconstructor->IsHLT()) break;
- fSieveSeeding++;
-
- // Rebuild plane configurations and indices taking only unused clusters into account
- quality = BuildSeedingConfigs(stack, configs);
- if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
-
- for(Int_t ip = 0; ip < kNPlanes; ip++){
- if(!(chamber = stack[ip])) continue;
- chamber->Build(fGeom);//Indices(fSieveSeeding);
- }
-
- if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10 || AliTRDReconstructor::GetStreamLevel()>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];memset(chamberQ, 0, kNPlanes*sizeof(Double_t));
- AliTRDtrackingChamber *chamber = NULL;
- 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 * const sseed, const Int_t * const ipar)
-{
-//
-// 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 = NULL;
- AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // 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 = NULL;
- 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 = NULL;
- 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()))){
- x0[iLayer] = fgkX0[iLayer];
- continue;
- }
- matrix->LocalToMaster(loc, glb);
- x0[iLayer] = glb[0];
- }
-
- AliDebug(2, 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, fkReconstructor)) 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;
-
- AliDebug(3, Form("Seeding clusters\n 0[%6.3f %6.3f %6.3f]\n 1[%6.3f %6.3f %6.3f]\n 2[%6.3f %6.3f %6.3f]\n 3[%6.3f %6.3f %6.3f].",
- c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(),
- c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(),
- c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(),
- c[3]->GetX(), c[3]->GetY(), c[3]->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(fkReconstructor);
- tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]);
- tseed->Init(GetRiemanFitter());
- tseed->SetStandAlone(kTRUE);
- }
-
- Bool_t isFake = kFALSE;
- if((fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming())
- ||AliTRDReconstructor::GetStreamLevel()>=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 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::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] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
- AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0]));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
- if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
- AliDebug(3, Form("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;
- if(/*fkReconstructor->IsHLT()*/kFALSE){
- cseed[jLayer].UpdateUsed();
- if(!cseed[jLayer].IsOK()) continue;
- }else{
- 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){
- AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes));
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- continue;
- }
-
- // temporary exit door for the HLT
- if(fkReconstructor->IsHLT()){
- // attach clusters to extrapolation chambers
- for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
- Int_t jLayer = planesExt[iLayer];
- if(!(chamber = stack[jLayer])) continue;
- if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue;
- cseed[jLayer].Fit();
- }
- //FitTiltedRiemanConstraint(&cseed[0], GetZ());
- fTrackQuality[ntracks] = 1.; // dummy value
- ntracks++;
- if(ntracks == kMaxTracksStack) return ntracks;
- cseed += 6;
- continue;
- }
-
-
- // Update Seeds and calculate Likelihood
- // fit tracklets and cook likelihood
- Double_t chi2Vals[4];
- chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE);
- for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
- Int_t jLayer = planes[iLayer];
- cseed[jLayer].Fit(1);
- }
- Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
-
- if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){
- AliDebug(3, Form("Filter on 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 preliminry results
- //seedQuality[ntracks] = like;
- fSeedLayer[ntracks] = config;/*sLayer;*/
-
- // attach clusters to the extrapolation seeds
- Int_t elayers(0);
- 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(1);
- cseed[jLayer] = pseed;
- chi2Vals[0] = FitTiltedRieman(cseed, kTRUE);
- cseed[jLayer].Fit(1);
- elayers++;
- }
-
- // AliInfo("Extrapolation done.");
- // Debug Stream containing all the 6 tracklets
- if((fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming())
- ||AliTRDReconstructor::GetStreamLevel()>=2){
- TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::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(fkRecoParam->HasImproveTracklets()){
- if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){
- AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
- AliDebug(3, "ImproveSeedQuality() failed.");
- }
- }
-
- // do track fitting with vertex constraint
- if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ());
- else chi2Vals[1] = -1.;
- chi2Vals[2] = GetChi2Z(&cseed[0]);
- chi2Vals[3] = GetChi2Phi(&cseed[0]);
-
- // calculate track quality
- fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]);
-
- if((fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming())
- ||AliTRDReconstructor::GetStreamLevel()>=2){
- TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::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";
- }
- if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){
- Double_t pt[]={0., 0.};
- for(Int_t il(0); il<kNPlanes; il++){
- if(!cseed[il].IsOK()) continue;
- pt[0] = GetBz()*kB2C/cseed[il].GetC();
- pt[1] = GetBz()*kB2C/cseed[il].GetC(1);
- break;
- }
- AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n"
- " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
- " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
- " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
- " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
- " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n"
- " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]"
- , ntracks, pt[0], pt[1], fTrackQuality[ntracks]
- ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n'
- ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n'
- ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n'
- ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n'
- ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n'
- ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'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 * const tracklet)
-{
-//
-// 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.
-
- if(fkReconstructor->IsHLT()) FitTiltedRiemanConstraint(tracklet, 0);
- Double_t alpha = AliTRDgeometry::GetAlpha();
- Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
-
- // find first good tracklet
- Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++;
- if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n"
- " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n"
- " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n"
- " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n"
- " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n"
- " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n"
- " %c[5] x0[%f] n[%d] nu[%d] OK[%c]"
- ,idx
- ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n'
- ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n'
- ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n'
- ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n'
- ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n'
- ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n'));
- return NULL;
- }
-
- Double_t dx(5.);
- Double_t x(tracklet[idx].GetX0() - dx);
- // Build track parameters
- Double_t params[] = {
- tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y
- ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z
- ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp
- ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl
- ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt
- };
- Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector()));
-
- 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[4]*params[4]*0.01; // s^2_1/pt
-
- AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift);
-
- AliTRDseedV1 *ptrTracklet = NULL;
-
- // skip Kalman filter for HLT
- if(/*fkReconstructor->IsHLT()*/kFALSE){
- for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) {
- track.UnsetTracklet(jLayer);
- ptrTracklet = &tracklet[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->CookLabel(.9);
- ptrTrack->SetReconstructor(fkReconstructor);
- return ptrTrack;
- }
-
- // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry"
- if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000) return NULL;
-
- track.ResetCovariance(1);
- Int_t nc = TMath::Abs(FollowBackProlongation(track));
- if((fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming())
- ||AliTRDReconstructor::GetStreamLevel()>5){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- Double_t p[5]; // Track Params for the Debug Stream
- track.GetExternalParameters(x, p);
- TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
- cs << "MakeTrack"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "nc=" << nc
- << "X=" << x
- << "Y=" << p[0]
- << "Z=" << p[1]
- << "snp=" << p[2]
- << "tnd=" << p[3]
- << "crv=" << p[4]
- << "Yin=" << params[0]
- << "Zin=" << params[1]
- << "snpin=" << params[2]
- << "tndin=" << params[3]
- << "crvin=" << params[4]
- << "track.=" << &track
- << "\n";
- }
- if (nc < 30){
- UnsetTrackletsTrack(&track);
- return NULL;
- }
- AliTRDtrackV1 *ptrTrack = SetTrack(&track);
- ptrTrack->SetReconstructor(fkReconstructor);
- ptrTrack->CookLabel(.9);
- for(Int_t il(kNPlanes); il--;){
- if(!(ptrTracklet = ptrTrack->GetTracklet(il))) continue;
- ptrTracklet->UseClusters();
- }
-
- // computes PID for track
- ptrTrack->CookPID();
- // update calibration references using this track
- AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
- if(!calibra){
- AliInfo("Could not get Calibra instance.");
- } else if(calibra->GetHisto2d()){
- calibra->UpdateHistogramsV1(ptrTrack);
- }
- return ptrTrack;
-}
-
-
-//____________________________________________________________________
-Bool_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed, Double_t &chi2)
-{
- //
- // 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 = NULL;
- AliTRDseedV1 bseed[AliTRDgeometry::kNlayer];
-
- Float_t quality(1.e3),
- lQuality[AliTRDgeometry::kNlayer] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3};
- Int_t rLayers(0);
- for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){
- bseed[jLayer] = cseed[jLayer];
- if(!bseed[jLayer].IsOK()) continue;
- rLayers++;
- lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
- quality += lQuality[jLayer];
- }
- if (rLayers > 0) {
- quality /= rLayers;
- }
- AliDebug(2, Form("Start N[%d] Q[%f] chi2[%f]", rLayers, quality, chi2));
-
- for (Int_t iter = 0; iter < 4; iter++) {
- // Try better cluster set
- Int_t nLayers(0); Float_t qualitynew(0.);
- Int_t indexes[4*AliTRDgeometry::kNlayer];
- TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE);
- for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) {
- Int_t bLayer = indexes[jLayer];
- bseed[bLayer].Reset("c");
- if(!(chamber = stack[bLayer])) continue;
- if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue;
- bseed[bLayer].Fit(1);
- if(!bseed[bLayer].IsOK()) continue;
- nLayers++;
- lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE);
- qualitynew += lQuality[jLayer];
- }
- if(rLayers > nLayers){
- AliDebug(1, Form("Lost %d tracklets while improving.", rLayers-nLayers));
- return iter>0?kTRUE:kFALSE;
- } else rLayers=nLayers;
- qualitynew /= rLayers;
-
- if(qualitynew > quality){
- AliDebug(4, Form("Quality[%f] worsen in iter[%d] to ref[%f].", qualitynew, iter, quality));
- return iter>0?kTRUE:kFALSE;
- } else quality = qualitynew;
-
- // try improve track parameters
- Float_t chi2new = FitTiltedRieman(bseed, kTRUE);
- if(chi2new > chi2){
- AliDebug(4, Form("Chi2[%f] worsen in iter[%d] to ref[%f].", chi2new, iter, chi2));
- return iter>0?kTRUE:kFALSE;
- } else chi2 = chi2new;
-
- // store better tracklets
- for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) cseed[jLayer]=bseed[jLayer];
- AliDebug(2, Form("Iter[%d] Q[%f] chi2[%f]", iter, quality, chi2));
-
-
- if((fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming())
- ||AliTRDReconstructor::GetStreamLevel()>=7){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
- TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker);
- cstreamer << "ImproveSeedQuality"
- << "EventNumber=" << eventNumber
- << "CandidateNumber=" << candidateNumber
- << "Iteration=" << iter
- << "S0.=" << &cseed[0]
- << "S1.=" << &cseed[1]
- << "S2.=" << &cseed[2]
- << "S3.=" << &cseed[3]
- << "S4.=" << &cseed[4]
- << "S5.=" << &cseed[5]
- << "FitterT.=" << tiltedRieman
- << "\n";
- }
- } // Loop: iter
-
- // we are sure that at least 4 tracklets are OK !
- return kTRUE;
-}
-
-//_________________________________________________________________________
-Double_t AliTRDtrackerV1::CalculateTrackLikelihood(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
- //
-
- // Non-constrained Tilted Riemann
- Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078);
- // Constrained Tilted Riemann
- Double_t likeChi2TC(1.);
- if(chi2[1]>0.){
- likeChi2TC = TMath::Exp(-chi2[1] * 0.677);
- Double_t r = likeChi2TC/likeChi2TR;
- if(r>1.e2){;} // -> a primary track use TC
- else if(r<1.e2) // -> a secondary track use TR
- likeChi2TC =1.;
- else{;} // -> test not conclusive
- }
- // Chi2 only on Z direction
- Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14);
- // Chi2 angular resolution
- Double_t likeChi2Phi= TMath::Exp(-chi2[3] * 3.23);
-
- Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2TC * likeChi2Phi;
-
- AliDebug(2, Form("Likelihood [%e]\n"
- " Rieman : chi2[%f] likelihood[%6.2e]\n"
- " Vertex : chi2[%f] likelihood[%6.2e]\n"
- " Z : chi2[%f] likelihood[%6.2e]\n"
- " Phi : chi2[%f] likelihood[%6.2e]"
- , trackLikelihood
- , chi2[0], likeChi2TR
- , chi2[1], likeChi2TC
- , chi2[2], likeChi2Z
- , chi2[3], likeChi2Phi
- ));
-
- if((fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming())
- ||AliTRDReconstructor::GetStreamLevel()>=2){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::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])
-{
- //
- // 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.
- 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 * fkRecoParam->GetPhiSlope());
- Double_t likechi2y = 0.0000000001;
- if (fkReconstructor->IsCosmic() || chi2y < fkRecoParam->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fkRecoParam->GetChi2YSlope());
- Double_t likechi2z = TMath::Exp(-chi2z * fkRecoParam->GetChi2ZSlope());
- Double_t likeN = TMath::Exp(-(fkRecoParam->GetNMeanClusters() - nclusters) / fkRecoParam->GetNSigmaClusters());
- Double_t like = likea * likechi2y * likechi2z * likeN;
-
- if((fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming())
- ||AliTRDReconstructor::GetStreamLevel()>=2){
- Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
- Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
- Int_t nTracklets = 0; Float_t meanNcls = 0;
- for(Int_t iseed=0; iseed < kNPlanes; iseed++){
- if(!cseed[iseed].IsOK()) continue;
- nTracklets++;
- meanNcls += cseed[iseed].GetN2();
- }
- if(nTracklets) meanNcls /= nTracklets;
- // The Debug Stream contains the seed
- TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::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=" << meanNcls
- << "\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;
- }
-}
-
-//____________________________________________________________________
-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;
- }
-}
-
-//____________________________________________________________________
-AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
-{
- if(!fClusters) return NULL;
- Int_t ncls = fClusters->GetEntriesFast();
- return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : NULL;
-}
-
-//____________________________________________________________________
-AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
-{
- if(!fTracklets) return NULL;
- Int_t ntrklt = fTracklets->GetEntriesFast();
- return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : NULL;
-}
-
-//____________________________________________________________________
-AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
-{
- if(!fTracks) return NULL;
- Int_t ntrk = fTracks->GetEntriesFast();
- return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : NULL;
-}
-
-
-
-// //_____________________________________________________________________________
-// 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;
-//
-// }
-
-
-//____________________________________________________________________
-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(const AliTRDseedV1 * const tracklets) const
-{
- // 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(const AliTRDseedV1 *const tracklets) const
-{
- // 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 AliTRDtrackerV1::GetChi2Phi(const AliTRDseedV1 *const tracklets) const
-{
- // Calculates normalized chi2 for angular resolution
- // chi2 = Sum chi2 / n_tracklets
-
- Double_t chi2 = 0; Int_t n = 0;
- for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
- if(!tracklets[iLayer].IsOK()) continue;
- chi2 += tracklets[iLayer].GetChi2Phi();
- n++;
- }
- return n ? chi2/n: 0.;
-}
-
-//____________________________________________________________________
-Float_t AliTRDtrackerV1::CalculateReferenceX(const AliTRDseedV1 *const 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 tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
-}
-
-//_____________________________________________________________________________
-Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *const 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;
-}
-
-//____________________________________________________________________
-void AliTRDtrackerV1::UnsetTrackletsTrack(const AliTRDtrackV1 * const track)
-{
-// Remove tracklets from tracker list attached to "track"
- Int_t idx(-1);
- for(Int_t il(0); il<kNPlanes; il++){
- if((idx = track->GetTrackletIndex(il)) < 0) continue;
- delete (fTracklets->RemoveAt(idx));
- }
-}
-
-
-///////////////////////////////////////////////////////
-// //
-// Resources of class AliTRDLeastSquare //
-// //
-///////////////////////////////////////////////////////
-
-//_____________________________________________________________________________
-AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
-//
-// Constructor of the nested class AliTRDtrackFitterLeastSquare
-//
-// Fast solving linear regresion in 2D
-// y=a + bx
-// The data members have the following meaning
-// fParams[0] : a
-// fParams[1] : b
-//
-// fSums[0] : S
-// fSums[1] : Sx
-// fSums[2] : Sy
-// fSums[3] : Sxy
-// fSums[4] : Sxx
-// fSums[5] : Syy
-//
-// fCovarianceMatrix[0] : s2a
-// fCovarianceMatrix[1] : s2b
-// fCovarianceMatrix[2] : cov(ab)
-
- memset(fParams, 0, sizeof(Double_t) * 2);
- memset(fSums, 0, sizeof(Double_t) * 6);
- memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
-
-}
-
-//_____________________________________________________________________________
-void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(const Double_t *const x, Double_t y, Double_t sigmaY){
- //
- // Adding Point to the fitter
- //
-
- Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
- weight *= weight;
- const 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(const Double_t *const x, Double_t y, Double_t sigmaY){
- //
- // Remove Point from the sample
- //
-
- Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9);
- weight *= weight;
- const 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;
-}
-
-//_____________________________________________________________________________
-Bool_t AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
- //
- // Evaluation of the fit:
- // Calculation of the parameters
- // Calculation of the covariance matrix
- //
-
- Double_t det = fSums[0] * fSums[4] - fSums[1] *fSums[1];
- if(TMath::Abs(det)<1.e-30) return kFALSE;
-
- // 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])/det;
- fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2])/det;
- // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
-
- // Covariance matrix
- Double_t den = fSums[0]*fSums[4] - fSums[1]*fSums[1];
- fCovarianceMatrix[0] = fSums[4] / den;
- fCovarianceMatrix[1] = fSums[0] / den;
- fCovarianceMatrix[2] = -fSums[1] / den;
-/* 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]);*/
-
-
-
- return kTRUE;
-}
-
-//_____________________________________________________________________________
-Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(const Double_t *const xpos) const {
- //
- // 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);
-}
-
-//_____________________________________________________________________________
-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(const AliTRDseedV1 * const 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());
-}
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