2 /**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
19 ///////////////////////////////////////////////////////////////////////////////
24 // Alex Bercuci <A.Bercuci@gsi.de> //
25 // Markus Fasel <M.Fasel@gsi.de> //
27 ///////////////////////////////////////////////////////////////////////////////
29 // #include <Riostream.h>
31 // #include <string.h>
34 #include <TDirectory.h>
35 #include <TLinearFitter.h>
37 #include <TClonesArray.h>
38 #include <TTreeStream.h>
41 #include "AliESDEvent.h"
42 #include "AliGeomManager.h"
43 #include "AliRieman.h"
44 #include "AliTrackPointArray.h"
46 #include "AliTRDgeometry.h"
47 #include "AliTRDpadPlane.h"
48 #include "AliTRDcalibDB.h"
49 #include "AliTRDReconstructor.h"
50 #include "AliTRDCalibraFillHisto.h"
51 #include "AliTRDrecoParam.h"
53 #include "AliTRDcluster.h"
54 #include "AliTRDseedV1.h"
55 #include "AliTRDtrackV1.h"
56 #include "AliTRDtrackerV1.h"
57 #include "AliTRDtrackerDebug.h"
58 #include "AliTRDtrackingChamber.h"
59 #include "AliTRDchamberTimeBin.h"
63 ClassImp(AliTRDtrackerV1)
66 const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; //
67 const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; //
68 const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; //
69 const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle
70 const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation
71 Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = {
72 0.1112, 0.1112, 0.1112, 0.0786, 0.0786,
73 0.0786, 0.0786, 0.0579, 0.0579, 0.0474,
74 0.0474, 0.0408, 0.0335, 0.0335, 0.0335
76 Int_t AliTRDtrackerV1::fgNTimeBins = 0;
77 TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0;
78 AliRieman* AliTRDtrackerV1::fgRieman = 0x0;
79 TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0;
80 TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0;
82 //____________________________________________________________________
83 AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec)
86 ,fGeom(new AliTRDgeometry())
93 // Default constructor.
95 AliTRDcalibDB *trd = 0x0;
96 if (!(trd = AliTRDcalibDB::Instance())) {
97 AliFatal("Could not get calibration object");
100 if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins();
102 for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector);
104 for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0;
106 // Initialize debug stream
107 if(rec) SetReconstructor(rec);
110 //____________________________________________________________________
111 AliTRDtrackerV1::~AliTRDtrackerV1()
117 if(fgDebugStreamer) delete fgDebugStreamer;
118 if(fgRieman) delete fgRieman;
119 if(fgTiltedRieman) delete fgTiltedRieman;
120 if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained;
121 for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl];
122 if(fTracks) {fTracks->Delete(); delete fTracks;}
123 if(fTracklets) {fTracklets->Delete(); delete fTracklets;}
125 fClusters->Delete(); delete fClusters;
127 if(fGeom) delete fGeom;
130 //____________________________________________________________________
131 Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd)
134 // Steering stand alone tracking for full TRD detector
137 // esd : The ESD event. On output it contains
138 // the ESD tracks found in TRD.
141 // Number of tracks found in the TRD detector.
143 // Detailed description
144 // 1. Launch individual SM trackers.
145 // See AliTRDtrackerV1::Clusters2TracksSM() for details.
148 if(!fReconstructor->GetRecoParam() ){
149 AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam().");
153 //AliInfo("Start Track Finder ...");
155 for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){
156 // for(int ism=1; ism<2; ism++){
157 //AliInfo(Form("Processing supermodule %i ...", ism));
158 ntracks += Clusters2TracksSM(ism, esd);
160 AliInfo(Form("Number of found tracks : %d", ntracks));
165 //_____________________________________________________________________________
166 Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const
168 //AliInfo(Form("Asking for tracklet %d", index));
170 AliTRDseedV1 *tracklet = GetTracklet(index);
171 if (!tracklet) return kFALSE;
173 // get detector for this tracklet
174 AliTRDcluster *cl = 0x0;
175 Int_t ic = 0; do; while(!(cl = tracklet->GetClusters(ic++)));
176 Int_t idet = cl->GetDetector();
179 local[0] = tracklet->GetX0();
180 local[1] = tracklet->GetYfit(0);
181 local[2] = tracklet->GetZfit(0);
183 fGeom->RotateBack(idet, local, global);
184 p.SetXYZ(global[0],global[1],global[2]);
188 AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1;
189 switch (fGeom->GetLayer(idet)) {
191 iLayer = AliGeomManager::kTRD1;
194 iLayer = AliGeomManager::kTRD2;
197 iLayer = AliGeomManager::kTRD3;
200 iLayer = AliGeomManager::kTRD4;
203 iLayer = AliGeomManager::kTRD5;
206 iLayer = AliGeomManager::kTRD6;
209 Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet);
210 UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId);
211 p.SetVolumeID(volid);
216 //____________________________________________________________________
217 TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter()
219 if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4");
220 return fgTiltedRieman;
223 //____________________________________________________________________
224 TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint()
226 if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2");
227 return fgTiltedRiemanConstrained;
230 //____________________________________________________________________
231 AliRieman* AliTRDtrackerV1::GetRiemanFitter()
233 if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNlayer);
237 //_____________________________________________________________________________
238 Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event)
241 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
242 // backpropagated by the TPC tracker. Each seed is first propagated
243 // to the TRD, and then its prolongation is searched in the TRD.
244 // If sufficiently long continuation of the track is found in the TRD
245 // the track is updated, otherwise it's stored as originaly defined
246 // by the TPC tracker.
249 // Calibration monitor
250 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
251 if (!calibra) AliInfo("Could not get Calibra instance\n");
253 Int_t found = 0; // number of tracks found
254 Float_t foundMin = 20.0;
256 Float_t *quality = 0x0;
258 Int_t nSeed = event->GetNumberOfTracks();
260 quality = new Float_t[nSeed];
261 index = new Int_t[nSeed];
262 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
263 AliESDtrack *seed = event->GetTrack(iSeed);
264 Double_t covariance[15];
265 seed->GetExternalCovariance(covariance);
266 quality[iSeed] = covariance[0] + covariance[2];
268 // Sort tracks according to covariance of local Y and Z
269 TMath::Sort(nSeed,quality,index,kFALSE);
272 // Backpropagate all seeds
275 for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) {
277 // Get the seeds in sorted sequence
278 AliESDtrack *seed = event->GetTrack(index[iSeed]);
280 // Check the seed status
281 ULong_t status = seed->GetStatus();
282 if ((status & AliESDtrack::kTPCout) == 0) continue;
283 if ((status & AliESDtrack::kTRDout) != 0) continue;
285 // Do the back prolongation
286 new(&track) AliTRDtrackV1(*seed);
287 track.SetReconstructor(fReconstructor);
289 //Int_t lbl = seed->GetLabel();
290 //track.SetSeedLabel(lbl);
292 // Make backup and mark entrance in the TRD
293 seed->UpdateTrackParams(&track, AliESDtrack::kTRDin);
294 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
295 Float_t p4 = track.GetC();
296 expectedClr = FollowBackProlongation(track);
298 if (expectedClr<0) continue; // Back prolongation failed
302 // computes PID for track
304 // update calibration references using this track
305 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track);
306 // save calibration object
307 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
308 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
310 track.UpdateESDtrack(seed);
312 // Add TRD track to ESDfriendTrack
313 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){
314 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track);
315 calibTrack->SetOwner();
316 seed->AddCalibObject(calibTrack);
321 if ((TMath::Abs(track.GetC() - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) {
323 // Make backup for back propagation
325 Int_t foundClr = track.GetNumberOfClusters();
326 if (foundClr >= foundMin) {
327 //AliInfo(Form("Making backup track ncls [%d]...", foundClr));
329 //track.CookdEdxTimBin(seed->GetID());
330 track.CookLabel(1. - fgkLabelFraction);
331 if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack());
333 // Sign only gold tracks
334 if (track.GetChi2() / track.GetNumberOfClusters() < 4) {
335 if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)){
336 //UseClusters(&track);
339 Bool_t isGold = kFALSE;
342 if (track.GetChi2() / track.GetNumberOfClusters() < 5) {
343 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
349 if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) {
350 //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
351 if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
356 if ((!isGold) && (track.GetBackupTrack())) {
357 if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) {
358 seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup);
363 //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) {
364 //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
369 // Propagation to the TOF (I.Belikov)
370 if (track.IsStopped() == kFALSE) {
371 Double_t xtof = 371.0;
372 Double_t xTOF0 = 370.0;
374 Double_t c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
375 if (TMath::Abs(c2) >= 0.99) continue;
377 if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue;
379 // Energy losses taken to the account - check one more time
380 c2 = track.GetSnp() + track.GetC() * (xtof - track.GetX());
381 if (TMath::Abs(c2) >= 0.99) continue;
383 //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) {
384 // fHBackfit->Fill(7);
389 Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha());
391 track.GetYAt(xtof,GetBz(),y);
393 if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue;
394 }else if (y < -ymax) {
395 if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue;
398 if (track.PropagateTo(xtof)) {
399 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
400 track.UpdateESDtrack(seed);
403 if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) {
404 seed->UpdateTrackParams(&track, AliESDtrack::kTRDout);
406 track.UpdateESDtrack(seed);
410 seed->SetTRDQuality(track.StatusForTOF());
411 seed->SetTRDBudget(track.GetBudget(0));
413 if(index) delete [] index;
414 if(quality) delete [] quality;
417 AliInfo(Form("Number of seeds: %d", nSeed));
418 AliInfo(Form("Number of back propagated TRD tracks: %d", found));
420 // run stand alone tracking
421 if (fReconstructor->IsSeeding()) Clusters2Tracks(event);
427 //____________________________________________________________________
428 Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event)
431 // Refits tracks within the TRD. The ESD event is expected to contain seeds
432 // at the outer part of the TRD.
433 // The tracks are propagated to the innermost time bin
434 // of the TRD and the ESD event is updated
435 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
438 Int_t nseed = 0; // contor for loaded seeds
439 Int_t found = 0; // contor for updated TRD tracks
443 for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) {
444 AliESDtrack *seed = event->GetTrack(itrack);
445 new(&track) AliTRDtrackV1(*seed);
447 if (track.GetX() < 270.0) {
448 seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup);
452 ULong_t status = seed->GetStatus();
453 // reject tracks which failed propagation in the TRD
454 if((status & AliESDtrack::kTRDout) == 0) continue;
456 // reject tracks which are produced by the TRD stand alone track finder.
457 if((status & AliESDtrack::kTRDin) == 0) continue;
460 track.ResetCovariance(50.0);
462 // do the propagation and processing
463 Bool_t kUPDATE = kFALSE;
464 Double_t xTPC = 250.0;
465 if(FollowProlongation(track)){
467 if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update
468 seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit);
474 // Prolongate to TPC without update
476 AliTRDtrackV1 tt(*seed);
477 if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit);
480 AliInfo(Form("Number of loaded seeds: %d",nseed));
481 AliInfo(Form("Number of found tracks from loaded seeds: %d",found));
486 //____________________________________________________________________
487 Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t)
489 // Extrapolates the TRD track in the TPC direction.
492 // t : the TRD track which has to be extrapolated
495 // number of clusters attached to the track
497 // Detailed description
499 // Starting from current radial position of track <t> this function
500 // extrapolates the track through the 6 TRD layers. The following steps
501 // are being performed for each plane:
503 // a. get plane limits in the local x direction
504 // b. check crossing sectors
505 // c. check track inclination
506 // 2. search tracklet in the tracker list (see GetTracklet() for details)
507 // 3. evaluate material budget using the geo manager
508 // 4. propagate and update track using the tracklet information.
513 Int_t nClustersExpected = 0;
514 Int_t lastplane = 5; //GetLastPlane(&t);
515 for (Int_t iplane = lastplane; iplane >= 0; iplane--) {
517 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
518 if(!tracklet) continue;
519 if(!tracklet->IsOK()) AliWarning("tracklet not OK");
521 Double_t x = tracklet->GetX0();
522 // reject tracklets which are not considered for inward refit
523 if(x > t.GetX()+fgkMaxStep) continue;
525 // append tracklet to track
526 t.SetTracklet(tracklet, index);
528 if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break;
529 if (!AdjustSector(&t)) break;
531 // Start global position
535 // End global position
536 Double_t alpha = t.GetAlpha(), y, z;
537 if (!t.GetProlongation(x,y,z)) break;
539 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
540 xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
543 // Get material budget
545 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
546 Double_t xrho= param[0]*param[4];
547 Double_t xx0 = param[1]; // Get mean propagation parameters
549 // Propagate and update
550 t.PropagateTo(x, xx0, xrho);
551 if (!AdjustSector(&t)) break;
553 Double_t maxChi2 = t.GetPredictedChi2(tracklet);
554 if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){
555 nClustersExpected += tracklet->GetN();
559 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
561 for(int iplane=0; iplane<6; iplane++){
562 AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index);
563 if(!tracklet) continue;
564 t.SetTracklet(tracklet, index);
567 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
568 TTreeSRedirector &cstreamer = *fgDebugStreamer;
569 cstreamer << "FollowProlongation"
570 << "EventNumber=" << eventNumber
571 << "ncl=" << nClustersExpected
576 return nClustersExpected;
580 //_____________________________________________________________________________
581 Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t)
583 // Extrapolates the TRD track in the TOF direction.
586 // t : the TRD track which has to be extrapolated
589 // number of clusters attached to the track
591 // Detailed description
593 // Starting from current radial position of track <t> this function
594 // extrapolates the track through the 6 TRD layers. The following steps
595 // are being performed for each plane:
597 // a. get plane limits in the local x direction
598 // b. check crossing sectors
599 // c. check track inclination
600 // 2. build tracklet (see AliTRDseed::AttachClusters() for details)
601 // 3. evaluate material budget using the geo manager
602 // 4. propagate and update track using the tracklet information.
607 Int_t nClustersExpected = 0;
608 Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick();
609 AliTRDtrackingChamber *chamber = 0x0;
611 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
612 // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array
613 AliTRDseedV1 *tracklets[kNPlanes];
614 memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes);
615 for(Int_t ip = 0; ip < kNPlanes; ip++){
616 tracklets[ip] = t.GetTracklet(ip);
620 // Loop through the TRD layers
621 for (Int_t ilayer = 0; ilayer < AliTRDgeometry::Nlayer(); ilayer++) {
622 // BUILD TRACKLET IF NOT ALREADY BUILT
623 Double_t x = 0., y, z, alpha;
624 ptrTracklet = tracklets[ilayer];
626 ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer);
627 ptrTracklet->SetReconstructor(fReconstructor);
628 alpha = t.GetAlpha();
629 Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector));
631 if(!fTrSec[sector].GetNChambers()) continue;
633 if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue;
635 if (!t.GetProlongation(x, y, z)) return -nClustersExpected;
636 Int_t stack = fGeom->GetStack(z, ilayer);
637 Int_t nCandidates = stack >= 0 ? 1 : 2;
638 z -= stack >= 0 ? 0. : 4.;
640 for(int icham=0; icham<nCandidates; icham++, z+=8){
641 if((stack = fGeom->GetStack(z, ilayer)) < 0) continue;
643 if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue;
645 if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
649 AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack);
650 tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()));
651 tracklet.SetPadLength(pp->GetLengthIPad());
652 tracklet.SetDetector(chamber->GetDetector());
654 if(!tracklet.Init(&t)){
656 return nClustersExpected;
658 if(!tracklet.AttachClustersIter(chamber, 1000.)) continue;
661 if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
665 //ptrTracklet->UseClusters();
667 if(!ptrTracklet->IsOK()){
668 if(x < 1.) continue; //temporary
669 if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected;
670 if(!AdjustSector(&t)) return -nClustersExpected;
671 if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected;
675 // Propagate closer to the current chamber if neccessary
677 if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -nClustersExpected;
678 if (!AdjustSector(&t)) return -nClustersExpected;
679 if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -nClustersExpected;
681 // load tracklet to the tracker and the track
682 ptrTracklet = SetTracklet(ptrTracklet);
683 t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
686 // Calculate the mean material budget along the path inside the chamber
687 //Calculate global entry and exit positions of the track in chamber (only track prolongation)
688 Double_t xyz0[3]; // entry point
690 alpha = t.GetAlpha();
691 x = ptrTracklet->GetX0();
692 if (!t.GetProlongation(x, y, z)) return -nClustersExpected;
693 Double_t xyz1[3]; // exit point
694 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
695 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
698 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
699 // The mean propagation parameters
700 Double_t xrho = param[0]*param[4]; // density*length
701 Double_t xx0 = param[1]; // radiation length
703 // Propagate and update track
704 if (!t.PropagateTo(x, xx0, xrho)) return -nClustersExpected;
705 if (!AdjustSector(&t)) return -nClustersExpected;
706 Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet);
707 if (!t.Update(ptrTracklet, maxChi2)) return -nClustersExpected;
709 nClustersExpected += ptrTracklet->GetN();
710 //t.SetTracklet(&tracklet, index);
712 // Reset material budget if 2 consecutive gold
713 if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.);
715 // Make backup of the track until is gold
716 // TO DO update quality check of the track.
717 // consider comparison with fTimeBinsRange
718 Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins);
719 //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1);
720 //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2());
721 //printf("ratio0 %f [> 0.8]\n", ratio0);
722 //printf("ratio1 %f [> 0.6]\n", ratio1);
723 //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1);
724 //printf("t.GetNCross() %d [== 0]\n", t.GetNCross());
725 //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp()));
726 //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters());
728 if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update
731 //(ratio0+ratio1 > 1.5) &&
732 (t.GetNCross() == 0) &&
733 (TMath::Abs(t.GetSnp()) < 0.85) &&
734 (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack();
738 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
739 TTreeSRedirector &cstreamer = *fgDebugStreamer;
740 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
741 //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t);
742 //debugTrack->SetOwner();
743 cstreamer << "FollowBackProlongation"
744 << "EventNumber=" << eventNumber
745 << "ncl=" << nClustersExpected
746 //<< "track.=" << debugTrack
750 return nClustersExpected;
753 //_________________________________________________________________________
754 Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){
756 // Fits a Riemann-circle to the given points without tilting pad correction.
757 // The fit is performed using an instance of the class AliRieman (equations
758 // and transformations see documentation of this class)
759 // Afterwards all the tracklets are Updated
761 // Parameters: - Array of tracklets (AliTRDseedV1)
762 // - Storage for the chi2 values (beginning with direction z)
763 // - Seeding configuration
764 // Output: - The curvature
766 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
768 Int_t allplanes[] = {0, 1, 2, 3, 4, 5};
769 Int_t *ppl = &allplanes[0];
775 for(Int_t il = 0; il < maxLayers; il++){
776 if(!tracklets[ppl[il]].IsOK()) continue;
777 fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10);
780 // Set the reference position of the fit and calculate the chi2 values
781 memset(chi2, 0, sizeof(Double_t) * 2);
782 for(Int_t il = 0; il < maxLayers; il++){
783 // Reference positions
784 tracklets[ppl[il]].Init(fitter);
787 if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue;
788 chi2[0] += tracklets[ppl[il]].GetChi2Y();
789 chi2[1] += tracklets[ppl[il]].GetChi2Z();
791 return fitter->GetC();
794 //_________________________________________________________________________
795 void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2])
798 // Performs a Riemann helix fit using the seedclusters as spacepoints
799 // Afterwards the chi2 values are calculated and the seeds are updated
801 // Parameters: - The four seedclusters
802 // - The tracklet array (AliTRDseedV1)
803 // - The seeding configuration
808 AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter();
810 for(Int_t i = 0; i < 4; i++)
811 fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10);
815 // Update the seed and calculated the chi2 value
816 chi2[0] = 0; chi2[1] = 0;
817 for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){
819 chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX()));
820 chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX()));
825 //_________________________________________________________________________
826 Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex)
829 // Fits a helix to the clusters. Pad tilting is considered. As constraint it is
830 // assumed that the vertex position is set to 0.
831 // This method is very usefull for high-pt particles
832 // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0
833 // x0, y0: Center of the circle
834 // Measured y-position: ymeas = y - tan(phiT)(zc - zt)
835 // zc: center of the pad row
836 // Equation which has to be fitted (after transformation):
837 // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0
841 // v = 2 * x * tan(phiT) * t
842 // Parameters in the equation:
843 // a = -1/y0, b = x0/y0, e = dz/dx
845 // The Curvature is calculated by the following equation:
846 // - curv = a/Sqrt(b^2 + 1) = 1/R
847 // Parameters: - the 6 tracklets
848 // - the Vertex constraint
849 // Output: - the Chi2 value of the track
854 TLinearFitter *fitter = GetTiltedRiemanFitterConstraint();
855 fitter->StoreData(kTRUE);
856 fitter->ClearPoints();
857 AliTRDcluster *cl = 0x0;
859 Float_t x, y, z, w, t, error, tilt;
862 for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){
863 if(!tracklets[ilr].IsOK()) continue;
864 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
865 if(!tracklets[ilr].IsUsable(itb)) continue;
866 cl = tracklets[ilr].GetClusters(itb);
870 tilt = tracklets[ilr].GetTilt();
872 t = 1./(x * x + y * y);
874 uvt[1] = 2. * x * t * tilt ;
875 w = 2. * (y + tilt * (z - zVertex)) * t;
876 error = 2. * 0.2 * t;
877 fitter->AddPoint(uvt, w, error);
883 // Calculate curvature
884 Double_t a = fitter->GetParameter(0);
885 Double_t b = fitter->GetParameter(1);
886 Double_t curvature = a/TMath::Sqrt(b*b + 1);
888 Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
889 for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++)
890 tracklets[ip].SetCC(curvature);
892 /* if(fReconstructor->GetStreamLevel() >= 5){
893 //Linear Model on z-direction
894 Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack
895 Double_t slope = fitter->GetParameter(2);
896 Double_t zref = slope * xref;
897 Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref);
898 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
899 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
900 TTreeSRedirector &treeStreamer = *fgDebugStreamer;
901 treeStreamer << "FitTiltedRiemanConstraint"
902 << "EventNumber=" << eventNumber
903 << "CandidateNumber=" << candidateNumber
904 << "Curvature=" << curvature
905 << "Chi2Track=" << chi2track
913 //_________________________________________________________________________
914 Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError)
917 // Performs a Riemann fit taking tilting pad correction into account
918 // The equation of a Riemann circle, where the y position is substituted by the
919 // measured y-position taking pad tilting into account, has to be transformed
920 // into a 4-dimensional hyperplane equation
921 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
922 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
923 // zc: center of the pad row
924 // zt: z-position of the track
925 // The z-position of the track is assumed to be linear dependent on the x-position
926 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
927 // Transformation: u = 2 * x * t
928 // v = 2 * tan(phiT) * t
929 // w = 2 * tan(phiT) * (x - xref) * t
930 // t = 1 / (x^2 + ymeas^2)
931 // Parameters: a = -1/y0
933 // c = (R^2 -x0^2 - y0^2)/y0
936 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
937 // results from the simple riemann fit. Afterwards the fit is redone.
938 // The curvature is calculated according to the formula:
939 // curv = a/(1 + b^2 + c*a) = 1/R
941 // Paramters: - Array of tracklets (connected to the track candidate)
942 // - Flag selecting the error definition
943 // Output: - Chi2 values of the track (in Parameter list)
945 TLinearFitter *fitter = GetTiltedRiemanFitter();
946 fitter->StoreData(kTRUE);
947 fitter->ClearPoints();
948 AliTRDLeastSquare zfitter;
949 AliTRDcluster *cl = 0x0;
951 Double_t xref = CalculateReferenceX(tracklets);
952 Double_t x, y, z, t, tilt, dx, w, we;
955 // Containers for Least-square fitter
956 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
957 if(!tracklets[ipl].IsOK()) continue;
958 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
959 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
960 if (!tracklets[ipl].IsUsable(itb)) continue;
964 tilt = tracklets[ipl].GetTilt();
970 uvt[2] = 2. * tilt * t;
971 uvt[3] = 2. * tilt * dx * t;
972 w = 2. * (y + tilt*z) * t;
973 // error definition changes for the different calls
975 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
976 fitter->AddPoint(uvt, w, we);
977 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
984 Double_t offset = fitter->GetParameter(3);
985 Double_t slope = fitter->GetParameter(4);
987 // Linear fitter - not possible to make boundaries
988 // Do not accept non possible z and dzdx combinations
989 Bool_t acceptablez = kTRUE;
991 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
992 if(!tracklets[iLayer].IsOK()) continue;
993 zref = offset + slope * (tracklets[iLayer].GetX0() - xref);
994 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
995 acceptablez = kFALSE;
998 Double_t dzmf = zfitter.GetFunctionParameter(1);
999 Double_t zmf = zfitter.GetFunctionValue(&xref);
1000 fgTiltedRieman->FixParameter(3, zmf);
1001 fgTiltedRieman->FixParameter(4, dzmf);
1003 fitter->ReleaseParameter(3);
1004 fitter->ReleaseParameter(4);
1005 offset = fitter->GetParameter(3);
1006 slope = fitter->GetParameter(4);
1009 // Calculate Curvarture
1010 Double_t a = fitter->GetParameter(0);
1011 Double_t b = fitter->GetParameter(1);
1012 Double_t c = fitter->GetParameter(2);
1013 Double_t curvature = 1.0 + b*b - c*a;
1014 if (curvature > 0.0)
1015 curvature = a / TMath::Sqrt(curvature);
1017 Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints);
1019 // Update the tracklets
1021 for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) {
1023 x = tracklets[iLayer].GetX0();
1029 // y: R^2 = (x - x0)^2 + (y - y0)^2
1030 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1031 // R = Sqrt() = 1/Curvature
1032 // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2)
1033 Double_t res = (x * a + b); // = (x - x0)/y0
1035 res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2
1037 res = TMath::Sqrt(res);
1038 y = (1.0 - res) / a;
1041 // dy: R^2 = (x - x0)^2 + (y - y0)^2
1042 // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0
1043 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1044 // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a)
1045 // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2)
1046 Double_t x0 = -b / a;
1047 if (-c * a + b * b + 1 > 0) {
1048 if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) {
1049 Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0));
1050 if (a < 0) yderiv *= -1.0;
1054 z = offset + slope * (x - xref);
1056 tracklets[iLayer].SetYref(0, y);
1057 tracklets[iLayer].SetYref(1, dy);
1058 tracklets[iLayer].SetZref(0, z);
1059 tracklets[iLayer].SetZref(1, dz);
1060 tracklets[iLayer].SetC(curvature);
1061 tracklets[iLayer].SetChi2(chi2track);
1064 /* if(fReconstructor->GetStreamLevel() >=5){
1065 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1066 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1067 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1068 Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref);
1069 cstreamer << "FitTiltedRieman0"
1070 << "EventNumber=" << eventNumber
1071 << "CandidateNumber=" << candidateNumber
1073 << "Chi2Z=" << chi2z
1080 //____________________________________________________________________
1081 Double_t AliTRDtrackerV1::FitLine(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points)
1083 AliTRDLeastSquare yfitter, zfitter;
1084 AliTRDcluster *cl = 0x0;
1086 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1088 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1089 if(!(tracklet = track->GetTracklet(ipl))) continue;
1090 if(!tracklet->IsOK()) continue;
1091 new(&work[ipl]) AliTRDseedV1(*tracklet);
1093 tracklets = &work[0];
1096 Double_t xref = CalculateReferenceX(tracklets);
1097 Double_t x, y, z, dx, ye, yr, tilt;
1098 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1099 if(!tracklets[ipl].IsOK()) continue;
1100 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1101 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1102 if (!tracklets[ipl].IsUsable(itb)) continue;
1106 zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1110 Double_t z0 = zfitter.GetFunctionParameter(0);
1111 Double_t dzdx = zfitter.GetFunctionParameter(1);
1112 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1113 if(!tracklets[ipl].IsOK()) continue;
1114 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1115 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1116 if (!tracklets[ipl].IsUsable(itb)) continue;
1120 tilt = tracklets[ipl].GetTilt();
1122 yr = y + tilt*(z - z0 - dzdx*dx);
1123 // error definition changes for the different calls
1124 ye = tilt*TMath::Sqrt(cl->GetSigmaZ2());
1125 ye += err ? tracklets[ipl].GetSigmaY() : 0.2;
1126 yfitter.AddPoint(&dx, yr, ye);
1130 Double_t y0 = yfitter.GetFunctionParameter(0);
1131 Double_t dydx = yfitter.GetFunctionParameter(1);
1132 Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints);
1134 //update track points array
1137 for(int ip=0; ip<np; ip++){
1138 points[ip].GetXYZ(xyz);
1139 xyz[1] = y0 + dydx * (xyz[0] - xref);
1140 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1141 points[ip].SetXYZ(xyz);
1148 //_________________________________________________________________________
1149 Double_t AliTRDtrackerV1::FitRiemanTilt(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points)
1152 // Performs a Riemann fit taking tilting pad correction into account
1153 // The equation of a Riemann circle, where the y position is substituted by the
1154 // measured y-position taking pad tilting into account, has to be transformed
1155 // into a 4-dimensional hyperplane equation
1156 // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0
1157 // Measured y-Position: ymeas = y - tan(phiT)(zc - zt)
1158 // zc: center of the pad row
1159 // zt: z-position of the track
1160 // The z-position of the track is assumed to be linear dependent on the x-position
1161 // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0
1162 // Transformation: u = 2 * x * t
1163 // v = 2 * tan(phiT) * t
1164 // w = 2 * tan(phiT) * (x - xref) * t
1165 // t = 1 / (x^2 + ymeas^2)
1166 // Parameters: a = -1/y0
1168 // c = (R^2 -x0^2 - y0^2)/y0
1171 // If the offset respectively the slope in z-position is impossible, the parameters are fixed using
1172 // results from the simple riemann fit. Afterwards the fit is redone.
1173 // The curvature is calculated according to the formula:
1174 // curv = a/(1 + b^2 + c*a) = 1/R
1176 // Paramters: - Array of tracklets (connected to the track candidate)
1177 // - Flag selecting the error definition
1178 // Output: - Chi2 values of the track (in Parameter list)
1180 TLinearFitter *fitter = GetTiltedRiemanFitter();
1181 fitter->StoreData(kTRUE);
1182 fitter->ClearPoints();
1183 AliTRDLeastSquare zfitter;
1184 AliTRDcluster *cl = 0x0;
1186 AliTRDseedV1 work[kNPlanes], *tracklet = 0x0;
1188 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1189 if(!(tracklet = track->GetTracklet(ipl))) continue;
1190 if(!tracklet->IsOK()) continue;
1191 new(&work[ipl]) AliTRDseedV1(*tracklet);
1193 tracklets = &work[0];
1196 Double_t xref = CalculateReferenceX(tracklets);
1197 Double_t x, y, z, t, tilt, dx, w, we;
1200 // Containers for Least-square fitter
1201 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
1202 if(!tracklets[ipl].IsOK()) continue;
1203 for(Int_t itb = 0; itb < fgNTimeBins; itb++){
1204 if(!(cl = tracklets[ipl].GetClusters(itb))) continue;
1205 if (!tracklets[ipl].IsUsable(itb)) continue;
1209 tilt = tracklets[ipl].GetTilt();
1213 uvt[0] = 2. * x * t;
1215 uvt[2] = 2. * tilt * t;
1216 uvt[3] = 2. * tilt * dx * t;
1217 w = 2. * (y + tilt*z) * t;
1218 // error definition changes for the different calls
1220 we *= sigError ? tracklets[ipl].GetSigmaY() : 0.2;
1221 fitter->AddPoint(uvt, w, we);
1222 zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2())));
1226 if(fitter->Eval()) return 1.E10;
1228 Double_t z0 = fitter->GetParameter(3);
1229 Double_t dzdx = fitter->GetParameter(4);
1232 // Linear fitter - not possible to make boundaries
1233 // Do not accept non possible z and dzdx combinations
1234 Bool_t accept = kTRUE;
1235 Double_t zref = 0.0;
1236 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
1237 if(!tracklets[iLayer].IsOK()) continue;
1238 zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref);
1239 if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0)
1244 Double_t dzmf = zfitter.GetFunctionParameter(1);
1245 Double_t zmf = zfitter.GetFunctionValue(&xref);
1246 fitter->FixParameter(3, zmf);
1247 fitter->FixParameter(4, dzmf);
1249 fitter->ReleaseParameter(3);
1250 fitter->ReleaseParameter(4);
1251 z0 = fitter->GetParameter(3); // = zmf ?
1252 dzdx = fitter->GetParameter(4); // = dzmf ?
1255 // Calculate Curvature
1256 Double_t a = fitter->GetParameter(0);
1257 Double_t b = fitter->GetParameter(1);
1258 Double_t c = fitter->GetParameter(2);
1259 Double_t y0 = 1. / a;
1260 Double_t x0 = -b * y0;
1261 Double_t R = TMath::Sqrt(y0*y0 + x0*x0 - c*y0);
1262 Double_t C = 1.0 + b*b - c*a;
1263 if (C > 0.0) C = a / TMath::Sqrt(C);
1265 // Calculate chi2 of the fit
1266 Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints);
1268 // Update the tracklets
1270 for(Int_t ip = 0; ip < kNPlanes; ip++) {
1271 x = tracklets[ip].GetX0();
1272 Double_t tmp = TMath::Sqrt(R*R-(x-x0)*(x-x0));
1274 // y: R^2 = (x - x0)^2 + (y - y0)^2
1275 // => y = y0 +/- Sqrt(R^2 - (x - x0)^2)
1276 tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp);
1277 // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2)
1278 tracklets[ip].SetYref(1, (x - x0) / tmp);
1279 tracklets[ip].SetZref(0, z0 + dzdx * (x - xref));
1280 tracklets[ip].SetZref(1, dzdx);
1281 tracklets[ip].SetC(C);
1282 tracklets[ip].SetChi2(chi2);
1286 //update track points array
1289 for(int ip=0; ip<np; ip++){
1290 points[ip].GetXYZ(xyz);
1291 xyz[1] = y0 - (y0>0.?1.:-1)*TMath::Sqrt(R*R-(xyz[0]-x0)*(xyz[0]-x0));
1292 xyz[2] = z0 + dzdx * (xyz[0] - xref);
1293 points[ip].SetXYZ(xyz);
1297 /* if(fReconstructor->GetStreamLevel() >=5){
1298 TTreeSRedirector &cstreamer = *fgDebugStreamer;
1299 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
1300 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
1301 Double_t chi2z = CalculateChi2Z(tracklets, z0, dzdx, xref);
1302 cstreamer << "FitRiemanTilt"
1303 << "EventNumber=" << eventNumber
1304 << "CandidateNumber=" << candidateNumber
1306 << "Chi2Z=" << chi2z
1313 //____________________________________________________________________
1314 Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points)
1316 // Kalman filter implementation for the TRD.
1317 // It returns the positions of the fit in the array "points"
1319 // Author : A.Bercuci@gsi.de
1321 //printf("Start track @ x[%f]\n", track->GetX());
1323 //prepare marker points along the track
1324 Int_t ip = np ? 0 : 1;
1326 if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break;
1327 //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX());
1330 //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX());
1333 AliTRDseedV1 tracklet, *ptrTracklet = 0x0;
1335 //Loop through the TRD planes
1336 for (Int_t jplane = 0; jplane < kNPlanes; jplane++) {
1337 // GET TRACKLET OR BUILT IT
1338 Int_t iplane = up ? jplane : kNPlanes - 1 - jplane;
1340 if(!(ptrTracklet = &tracklets[iplane])) continue;
1342 if(!(ptrTracklet = track->GetTracklet(iplane))){
1343 /*AliTRDtrackerV1 *tracker = 0x0;
1344 if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue;
1345 ptrTracklet = new(&tracklet) AliTRDseedV1(iplane);
1346 if(!tracker->MakeTracklet(ptrTracklet, track)) */
1350 if(!ptrTracklet->IsOK()) continue;
1352 Double_t x = ptrTracklet->GetX0();
1355 //don't do anything if next marker is after next update point.
1356 if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break;
1358 //printf("Propagate to x[%d] = %f\n", ip, points[ip].GetX());
1360 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1362 Double_t xyz[3]; // should also get the covariance
1363 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1366 //printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x);
1368 //Propagate closer to the next update point
1369 if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.;
1371 if(!AdjustSector(track)) return -1;
1372 if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1;
1374 //load tracklet to the tracker and the track
1376 if((index = FindTracklet(ptrTracklet)) < 0){
1377 ptrTracklet = SetTracklet(&tracklet);
1378 index = fTracklets->GetEntriesFast()-1;
1380 track->SetTracklet(ptrTracklet, index);*/
1383 // register tracklet to track with tracklet creation !!
1384 // PropagateBack : loaded tracklet to the tracker and update index
1385 // RefitInward : update index
1386 // MakeTrack : loaded tracklet to the tracker and update index
1387 if(!tracklets) track->SetTracklet(ptrTracklet, -1);
1390 //Calculate the mean material budget along the path inside the chamber
1391 Double_t xyz0[3]; track->GetXYZ(xyz0);
1392 Double_t alpha = track->GetAlpha();
1393 Double_t xyz1[3], y, z;
1394 if(!track->GetProlongation(x, y, z)) return -1;
1395 xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha);
1396 xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha);
1399 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
1400 Double_t xrho = param[0]*param[4]; // density*length
1401 Double_t xx0 = param[1]; // radiation length
1403 //Propagate the track
1404 track->PropagateTo(x, xx0, xrho);
1405 if (!AdjustSector(track)) break;
1408 Double_t chi2 = track->GetPredictedChi2(ptrTracklet);
1409 if(chi2<1e+10) track->Update(ptrTracklet, chi2);
1413 //Reset material budget if 2 consecutive gold
1414 if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.);
1415 } // end planes loop
1419 if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.;
1421 Double_t xyz[3]; // should also get the covariance
1422 track->GetXYZ(xyz); points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]);
1426 return track->GetChi2();
1429 //_________________________________________________________________________
1430 Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref)
1433 // Calculates the chi2-value of the track in z-Direction including tilting pad correction.
1434 // A linear dependence on the x-value serves as a model.
1435 // The parameters are related to the tilted Riemann fit.
1436 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
1437 // - the offset for the reference x
1439 // - the reference x position
1440 // Output: - The Chi2 value of the track in z-Direction
1442 Float_t chi2Z = 0, nLayers = 0;
1443 for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) {
1444 if(!tracklets[iLayer].IsOK()) continue;
1445 Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref);
1446 chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z);
1449 chi2Z /= TMath::Max((nLayers - 3.0),1.0);
1453 //_____________________________________________________________________________
1454 Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep)
1457 // Starting from current X-position of track <t> this function
1458 // extrapolates the track up to radial position <xToGo>.
1459 // Returns 1 if track reaches the plane, and 0 otherwise
1462 const Double_t kEpsilon = 0.00001;
1464 // Current track X-position
1465 Double_t xpos = t.GetX();
1467 // Direction: inward or outward
1468 Double_t dir = (xpos < xToGo) ? 1.0 : -1.0;
1470 while (((xToGo - xpos) * dir) > kEpsilon) {
1479 // The next step size
1480 Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep);
1482 // Get the global position of the starting point
1485 // X-position after next step
1488 // Get local Y and Z at the X-position of the next step
1489 if (!t.GetProlongation(x,y,z)) {
1490 return 0; // No prolongation possible
1493 // The global position of the end point of this prolongation step
1494 xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha());
1495 xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha());
1498 // Calculate the mean material budget between start and
1499 // end point of this prolongation step
1500 AliTracker::MeanMaterialBudget(xyz0, xyz1, param);
1502 // Propagate the track to the X-position after the next step
1503 if (!t.PropagateTo(x,param[1],param[0]*param[4])) {
1507 // Rotate the track if necessary
1510 // New track X-position
1520 //_____________________________________________________________________________
1521 Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const
1524 // Reads AliTRDclusters from the file.
1525 // The names of the cluster tree and branches
1526 // should match the ones used in AliTRDclusterizer::WriteClusters()
1529 Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster)));
1530 TObjArray *clusterArray = new TObjArray(nsize+1000);
1532 TBranch *branch = clusterTree->GetBranch("TRDcluster");
1534 AliError("Can't get the branch !");
1537 branch->SetAddress(&clusterArray);
1540 Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters();
1541 if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector;
1542 array = new TClonesArray("AliTRDcluster", Int_t(nclusters));
1543 array->SetOwner(kTRUE);
1546 // Loop through all entries in the tree
1547 Int_t nEntries = (Int_t) clusterTree->GetEntries();
1550 AliTRDcluster *c = 0x0;
1551 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1553 nbytes += clusterTree->GetEvent(iEntry);
1555 // Get the number of points in the detector
1556 Int_t nCluster = clusterArray->GetEntriesFast();
1557 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1558 if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue;
1560 new((*fClusters)[ncl++]) AliTRDcluster(*c);
1561 delete (clusterArray->RemoveAt(iCluster));
1565 delete clusterArray;
1570 //_____________________________________________________________________________
1571 Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree)
1574 // Fills clusters into TRD tracking sectors
1577 if(!fReconstructor->IsWritingClusters()){
1578 fClusters = AliTRDReconstructor::GetClusters();
1580 if (ReadClusters(fClusters, cTree)) {
1581 AliError("Problem with reading the clusters !");
1587 if(!fClusters || !fClusters->GetEntriesFast()){
1588 AliInfo("No TRD clusters");
1593 BuildTrackingContainers();
1595 //Int_t ncl = fClusters->GetEntriesFast();
1596 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1601 //_____________________________________________________________________________
1602 Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters)
1605 // Fills clusters into TRD tracking sectors
1606 // Function for use in the HLT
1608 if(!clusters || !clusters->GetEntriesFast()){
1609 AliInfo("No TRD clusters");
1613 fClusters = clusters;
1617 BuildTrackingContainers();
1619 //Int_t ncl = fClusters->GetEntriesFast();
1620 //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl));
1626 //____________________________________________________________________
1627 Int_t AliTRDtrackerV1::BuildTrackingContainers()
1629 // Building tracking containers for clusters
1631 Int_t nin =0, icl = fClusters->GetEntriesFast();
1633 AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl);
1634 if(c->IsInChamber()) nin++;
1635 Int_t detector = c->GetDetector();
1636 Int_t sector = fGeom->GetSector(detector);
1637 Int_t stack = fGeom->GetStack(detector);
1638 Int_t layer = fGeom->GetLayer(detector);
1640 fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl);
1643 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
1644 for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){
1645 if(!fTrSec[isector].GetNChambers()) continue;
1646 fTrSec[isector].Init(fReconstructor, cal);
1654 //____________________________________________________________________
1655 void AliTRDtrackerV1::UnloadClusters()
1658 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1661 if(fTracks) fTracks->Delete();
1662 if(fTracklets) fTracklets->Delete();
1664 if(IsClustersOwner()) fClusters->Delete();
1666 // save clusters array in the reconstructor for further use.
1667 if(!fReconstructor->IsWritingClusters()){
1668 AliTRDReconstructor::SetClusters(fClusters);
1669 SetClustersOwner(kFALSE);
1670 } else AliTRDReconstructor::SetClusters(0x0);
1673 for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear();
1675 // Increment the Event Number
1676 AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1);
1679 //_____________________________________________________________________________
1680 Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track)
1683 // Rotates the track when necessary
1686 Double_t alpha = AliTRDgeometry::GetAlpha();
1687 Double_t y = track->GetY();
1688 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
1691 if (!track->Rotate( alpha)) {
1695 else if (y < -ymax) {
1696 if (!track->Rotate(-alpha)) {
1706 //____________________________________________________________________
1707 AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx)
1709 // Find tracklet for TRD track <track>
1718 // Detailed description
1720 idx = track->GetTrackletIndex(p);
1721 AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx);
1726 //____________________________________________________________________
1727 AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet)
1729 // Add this tracklet to the list of tracklets stored in the tracker
1732 // - tracklet : pointer to the tracklet to be added to the list
1735 // - the index of the new tracklet in the tracker tracklets list
1737 // Detailed description
1738 // Build the tracklets list if it is not yet created (late initialization)
1739 // and adds the new tracklet to the list.
1742 fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
1743 fTracklets->SetOwner(kTRUE);
1745 Int_t nentries = fTracklets->GetEntriesFast();
1746 return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet);
1749 //____________________________________________________________________
1750 AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track)
1752 // Add this track to the list of tracks stored in the tracker
1755 // - track : pointer to the track to be added to the list
1758 // - the pointer added
1760 // Detailed description
1761 // Build the tracks list if it is not yet created (late initialization)
1762 // and adds the new track to the list.
1765 fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack);
1766 fTracks->SetOwner(kTRUE);
1768 Int_t nentries = fTracks->GetEntriesFast();
1769 return new ((*fTracks)[nentries]) AliTRDtrackV1(*track);
1774 //____________________________________________________________________
1775 Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd)
1778 // Steer tracking for one SM.
1781 // sector : Array of (SM) propagation layers containing clusters
1782 // esd : The current ESD event. On output it contains the also
1783 // the ESD (TRD) tracks found in this SM.
1786 // Number of tracks found in this TRD supermodule.
1788 // Detailed description
1790 // 1. Unpack AliTRDpropagationLayers objects for each stack.
1791 // 2. Launch stack tracking.
1792 // See AliTRDtrackerV1::Clusters2TracksStack() for details.
1793 // 3. Pack results in the ESD event.
1796 // allocate space for esd tracks in this SM
1797 TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack);
1798 esdTrackList.SetOwner();
1801 Int_t nChambers = 0;
1802 AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0;
1803 for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){
1804 if(!(stack = fTrSec[sector].GetStack(istack))) continue;
1806 for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){
1807 if(!(chamber = stack[ilayer])) continue;
1808 if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue;
1810 //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters()));
1812 if(nChambers < 4) continue;
1813 //AliInfo(Form("Doing stack %d", istack));
1814 nTracks += Clusters2TracksStack(stack, &esdTrackList);
1816 //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks()));
1818 for(int itrack=0; itrack<nTracks; itrack++)
1819 esd->AddTrack((AliESDtrack*)esdTrackList[itrack]);
1821 // Reset Track and Candidate Number
1822 AliTRDtrackerDebug::SetCandidateNumber(0);
1823 AliTRDtrackerDebug::SetTrackNumber(0);
1827 //____________________________________________________________________
1828 Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList)
1831 // Make tracks in one TRD stack.
1834 // layer : Array of stack propagation layers containing clusters
1835 // esdTrackList : Array of ESD tracks found by the stand alone tracker.
1836 // On exit the tracks found in this stack are appended.
1839 // Number of tracks found in this stack.
1841 // Detailed description
1843 // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details.
1844 // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations.
1845 // See AliTRDtrackerV1::MakeSeeds() for more details.
1846 // 3. Arrange track candidates in decreasing order of their quality
1847 // 4. Classify tracks in 5 categories according to:
1848 // a) number of layers crossed
1850 // 5. Sign clusters by tracks in decreasing order of track quality
1851 // 6. Build AliTRDtrack out of seeding tracklets
1853 // 8. Build ESD track and register it to the output list
1856 const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det();
1857 AliTRDtrackingChamber *chamber = 0x0;
1858 AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized
1859 Int_t pars[4]; // MakeSeeds parameters
1861 //Double_t alpha = AliTRDgeometry::GetAlpha();
1862 //Double_t shift = .5 * alpha;
1863 Int_t configs[kNConfigs];
1865 // Build initial seeding configurations
1866 Double_t quality = BuildSeedingConfigs(stack, configs);
1867 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
1868 AliInfo(Form("Plane config %d %d %d Quality %f"
1869 , configs[0], configs[1], configs[2], quality));
1873 // Initialize contors
1874 Int_t ntracks, // number of TRD track candidates
1875 ntracks1, // number of registered TRD tracks/iter
1876 ntracks2 = 0; // number of all registered TRD tracks in stack
1880 Int_t ic = 0; AliTRDtrackingChamber **cIter = &stack[0];
1881 while(ic<kNPlanes && !(*cIter)){ic++; cIter++;}
1882 if(!(*cIter)) return ntracks2;
1883 Int_t istack = fGeom->GetStack((*cIter)->GetDetector());
1886 // Loop over seeding configurations
1887 ntracks = 0; ntracks1 = 0;
1888 for (Int_t iconf = 0; iconf<3; iconf++) {
1889 pars[0] = configs[iconf];
1892 ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars);
1893 if(ntracks == kMaxTracksStack) break;
1895 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding));
1899 // Sort the seeds according to their quality
1900 Int_t sort[kMaxTracksStack];
1901 TMath::Sort(ntracks, fTrackQuality, sort, kTRUE);
1903 // Initialize number of tracks so far and logic switches
1904 Int_t ntracks0 = esdTrackList->GetEntriesFast();
1905 Bool_t signedTrack[kMaxTracksStack];
1906 Bool_t fakeTrack[kMaxTracksStack];
1907 for (Int_t i=0; i<ntracks; i++){
1908 signedTrack[i] = kFALSE;
1909 fakeTrack[i] = kFALSE;
1911 //AliInfo("Selecting track candidates ...");
1913 // Sieve clusters in decreasing order of track quality
1914 Double_t trackParams[7];
1915 // AliTRDseedV1 *lseed = 0x0;
1916 Int_t jSieve = 0, candidates;
1918 //AliInfo(Form("\t\tITER = %i ", jSieve));
1920 // Check track candidates
1922 for (Int_t itrack = 0; itrack < ntracks; itrack++) {
1923 Int_t trackIndex = sort[itrack];
1924 if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue;
1927 // Calculate track parameters from tracklets seeds
1932 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1933 Int_t jseed = kNPlanes*trackIndex+jLayer;
1934 if(!sseed[jseed].IsOK()) continue;
1935 if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++;
1937 sseed[jseed].UpdateUsed();
1938 ncl += sseed[jseed].GetN2();
1939 nused += sseed[jseed].GetNUsed();
1943 // Filter duplicated tracks
1945 //printf("Skip %d nused %d\n", trackIndex, nused);
1946 fakeTrack[trackIndex] = kTRUE;
1949 if (Float_t(nused)/ncl >= .25){
1950 //printf("Skip %d nused/ncl >= .25\n", trackIndex);
1951 fakeTrack[trackIndex] = kTRUE;
1956 Bool_t skip = kFALSE;
1959 if(nlayers < 6) {skip = kTRUE; break;}
1960 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1964 if(nlayers < findable){skip = kTRUE; break;}
1965 if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;}
1969 if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;}
1970 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;}
1974 if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;}
1978 if (nlayers == 3){skip = kTRUE; break;}
1979 //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;}
1984 //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused);
1987 signedTrack[trackIndex] = kTRUE;
1991 AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1;
1992 for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) {
1993 Int_t jseed = kNPlanes*trackIndex+jLayer;
1994 if(!sseed[jseed].IsOK()) continue;
1995 if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian
1996 sseed[jseed].UseClusters();
1999 while(!(cl = sseed[jseed].GetClusters(ic))) ic++;
2000 clusterIndex = sseed[jseed].GetIndexes(ic);
2006 // Build track parameters
2007 AliTRDseedV1 *lseed =&sseed[trackIndex*6];
2009 while(idx<3 && !lseed->IsOK()) {
2013 Double_t x = lseed->GetX0();// - 3.5;
2014 trackParams[0] = x; //NEW AB
2015 trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x);
2016 trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x);
2017 trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1)));
2018 trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1));
2019 trackParams[5] = lseed->GetC();
2020 Int_t ich = 0; while(!(chamber = stack[ich])) ich++;
2021 trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/
2023 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
2024 AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1]));
2026 Int_t nclusters = 0;
2027 AliTRDseedV1 *dseed[6];
2029 // Build track label - what happens if measured data ???
2034 Int_t labelsall[1000];
2035 Int_t nlabelsall = 0;
2036 Int_t naccepted = 0;
2038 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2039 Int_t jseed = kNPlanes*trackIndex+iLayer;
2040 dseed[iLayer] = new AliTRDseedV1(sseed[jseed]);
2041 dseed[iLayer]->SetOwner();
2042 nclusters += sseed[jseed].GetN2();
2043 if(!sseed[jseed].IsOK()) continue;
2044 for(int ilab=0; ilab<2; ilab++){
2045 if(sseed[jseed].GetLabels(ilab) < 0) continue;
2046 labels[nlab] = sseed[jseed].GetLabels(ilab);
2051 for (Int_t itime = 0; itime < fgNTimeBins; itime++) {
2052 if(!sseed[jseed].IsUsable(itime)) continue;
2054 Int_t tindex = 0, ilab = 0;
2055 while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){
2056 labelsall[nlabelsall++] = tindex;
2061 Freq(nlab,labels,outlab,kFALSE);
2062 Int_t label = outlab[0];
2063 Int_t frequency = outlab[1];
2064 Freq(nlabelsall,labelsall,outlab,kFALSE);
2065 Int_t label1 = outlab[0];
2066 Int_t label2 = outlab[2];
2067 Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted);
2069 //Int_t eventNrInFile = esd->GetEventNumberInFile();
2070 //AliInfo(Form("Number of clusters %d.", nclusters));
2071 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2072 Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber();
2073 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2074 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2075 cstreamer << "Clusters2TracksStack"
2076 << "EventNumber=" << eventNumber
2077 << "TrackNumber=" << trackNumber
2078 << "CandidateNumber=" << candidateNumber
2079 << "Iter=" << fSieveSeeding
2080 << "Like=" << fTrackQuality[trackIndex]
2081 << "S0.=" << dseed[0]
2082 << "S1.=" << dseed[1]
2083 << "S2.=" << dseed[2]
2084 << "S3.=" << dseed[3]
2085 << "S4.=" << dseed[4]
2086 << "S5.=" << dseed[5]
2087 << "p0=" << trackParams[0]
2088 << "p1=" << trackParams[1]
2089 << "p2=" << trackParams[2]
2090 << "p3=" << trackParams[3]
2091 << "p4=" << trackParams[4]
2092 << "p5=" << trackParams[5]
2093 << "p6=" << trackParams[6]
2094 << "Label=" << label
2095 << "Label1=" << label1
2096 << "Label2=" << label2
2097 << "FakeRatio=" << fakeratio
2098 << "Freq=" << frequency
2100 << "NLayers=" << nlayers
2101 << "Findable=" << findable
2102 << "NUsed=" << nused
2106 AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams);
2108 AliWarning("Fail to build a TRD Track.");
2112 //AliInfo("End of MakeTrack()");
2113 AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack();
2114 esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout);
2115 esdTrack->SetLabel(track->GetLabel());
2116 track->UpdateESDtrack(esdTrack);
2117 // write ESD-friends if neccessary
2118 if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){
2119 AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track);
2120 calibTrack->SetOwner();
2121 esdTrack->AddCalibObject(calibTrack);
2124 AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1);
2128 } while(jSieve<5 && candidates); // end track candidates sieve
2129 if(!ntracks1) break;
2131 // increment counters
2132 ntracks2 += ntracks1;
2134 if(fReconstructor->IsHLT()) break;
2137 // Rebuild plane configurations and indices taking only unused clusters into account
2138 quality = BuildSeedingConfigs(stack, configs);
2139 if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break;
2141 for(Int_t ip = 0; ip < kNPlanes; ip++){
2142 if(!(chamber = stack[ip])) continue;
2143 chamber->Build(fGeom, cal);//Indices(fSieveSeeding);
2146 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
2147 AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality));
2149 } while(fSieveSeeding<10); // end stack clusters sieve
2153 //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1]));
2158 //___________________________________________________________________
2159 Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs)
2162 // Assign probabilities to chambers according to their
2163 // capability of producing seeds.
2167 // layers : Array of stack propagation layers for all 6 chambers in one stack
2168 // configs : On exit array of configuration indexes (see GetSeedingConfig()
2169 // for details) in the decreasing order of their seeding probabilities.
2173 // Return top configuration quality
2175 // Detailed description:
2177 // To each chamber seeding configuration (see GetSeedingConfig() for
2178 // the list of all configurations) one defines 2 quality factors:
2179 // - an apriori topological quality (see GetSeedingConfig() for details) and
2180 // - a data quality based on the uniformity of the distribution of
2181 // clusters over the x range (time bins population). See CookChamberQA() for details.
2182 // The overall chamber quality is given by the product of this 2 contributions.
2185 Double_t chamberQ[kNPlanes];
2186 AliTRDtrackingChamber *chamber = 0x0;
2187 for(int iplane=0; iplane<kNPlanes; iplane++){
2188 if(!(chamber = stack[iplane])) continue;
2189 chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.;
2192 Double_t tconfig[kNConfigs];
2194 for(int iconf=0; iconf<kNConfigs; iconf++){
2195 GetSeedingConfig(iconf, planes);
2196 tconfig[iconf] = fgTopologicQA[iconf];
2197 for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]];
2200 TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE);
2201 // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]]));
2202 // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]]));
2203 // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]]));
2205 return tconfig[configs[0]];
2208 //____________________________________________________________________
2209 Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar)
2212 // Make tracklet seeds in the TRD stack.
2215 // layers : Array of stack propagation layers containing clusters
2216 // sseed : Array of empty tracklet seeds. On exit they are filled.
2217 // ipar : Control parameters:
2218 // ipar[0] -> seeding chambers configuration
2219 // ipar[1] -> stack index
2220 // ipar[2] -> number of track candidates found so far
2223 // Number of tracks candidates found.
2225 // Detailed description
2227 // The following steps are performed:
2228 // 1. Select seeding layers from seeding chambers
2229 // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack.
2230 // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in
2231 // this order. The parameters controling the range of accepted clusters in
2232 // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond().
2233 // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**))
2234 // 4. Initialize seeding tracklets in the seeding chambers.
2236 // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer))
2237 // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer))
2238 // 6. Attach clusters to seeding tracklets and find linear approximation of
2239 // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used
2240 // clusters used by current seeds should not exceed ... (25).
2242 // All 4 seeding tracklets should be correctly constructed (see
2243 // AliTRDseedV1::AttachClustersIter())
2244 // 8. Helix fit of the seeding tracklets
2246 // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details)
2247 // 10. Extrapolation of the helix fit to the other 2 chambers:
2248 // a) Initialization of extrapolation tracklet with fit parameters
2249 // b) Helix fit of tracklets
2250 // c) Attach clusters and linear interpolation to extrapolated tracklets
2251 // d) Helix fit of tracklets
2252 // 11. Improve seeding tracklets quality by reassigning clusters.
2253 // See AliTRDtrackerV1::ImproveSeedQuality() for details.
2254 // 12. Helix fit of all 6 seeding tracklets and chi2 calculation
2255 // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details.
2256 // 14. Cooking labels for tracklets. Should be done only for MC
2257 // 15. Register seeds.
2260 AliTRDtrackingChamber *chamber = 0x0;
2261 AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters
2262 AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track
2263 Int_t ncl, mcl; // working variable for looping over clusters
2264 Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer];
2266 // chi2[0] = tracklet chi2 on the Z direction
2267 // chi2[1] = tracklet chi2 on the R direction
2270 // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters
2271 // Positions taken using cosmic data taken with SM3 after rebuild
2272 Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2};
2274 // this should be data member of AliTRDtrack
2275 Double_t seedQuality[kMaxTracksStack];
2277 // unpack control parameters
2278 Int_t config = ipar[0];
2279 Int_t ntracks = ipar[1];
2280 Int_t istack = ipar[2];
2281 Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes);
2282 Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt);
2285 // Init chambers geometry
2286 Double_t hL[kNPlanes]; // Tilting angle
2287 Float_t padlength[kNPlanes]; // pad lenghts
2288 AliTRDpadPlane *pp = 0x0;
2289 for(int iplane=0; iplane<kNPlanes; iplane++){
2290 pp = fGeom->GetPadPlane(iplane, istack);
2291 hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle());
2292 padlength[iplane] = pp->GetLengthIPad();
2295 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
2296 AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks));
2299 // Build seeding layers
2302 for(int isl=0; isl<kNSeedPlanes; isl++){
2303 if(!(chamber = stack[planes[isl]])) continue;
2304 if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue;
2307 if(nlayers < 4) return 0;
2310 // Start finding seeds
2311 Double_t cond0[4], cond1[4], cond2[4];
2313 while((c[3] = (*fSeedTB[3])[icl++])){
2315 fSeedTB[0]->BuildCond(c[3], cond0, 0);
2316 fSeedTB[0]->GetClusters(cond0, index, ncl);
2317 //printf("Found c[3] candidates 0 %d\n", ncl);
2320 c[0] = (*fSeedTB[0])[index[jcl++]];
2322 Double_t dx = c[3]->GetX() - c[0]->GetX();
2323 Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx;
2324 Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx;
2325 fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi);
2326 fSeedTB[1]->GetClusters(cond1, jndex, mcl);
2327 //printf("Found c[0] candidates 1 %d\n", mcl);
2331 c[1] = (*fSeedTB[1])[jndex[kcl++]];
2333 fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi);
2334 c[2] = fSeedTB[2]->GetNearestCluster(cond2);
2335 //printf("Found c[1] candidate 2 %p\n", c[2]);
2338 // AliInfo("Seeding clusters found. Building seeds ...");
2339 // for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ());
2341 for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset();
2345 AliTRDseedV1 *tseed = &cseed[0];
2346 AliTRDtrackingChamber **cIter = &stack[0];
2347 for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){
2348 tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1);
2349 tseed->SetTilt(hL[iLayer]);
2350 tseed->SetPadLength(padlength[iLayer]);
2351 tseed->SetReconstructor(fReconstructor);
2352 tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]);
2353 tseed->Init(GetRiemanFitter());
2356 Bool_t isFake = kFALSE;
2357 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
2358 if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2359 if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2360 if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE;
2363 for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX();
2365 for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0);
2366 Int_t ll = c[3]->GetLabel(0);
2367 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2368 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2369 AliRieman *rim = GetRiemanFitter();
2370 TTreeSRedirector &cs0 = *fgDebugStreamer;
2372 <<"EventNumber=" << eventNumber
2373 <<"CandidateNumber=" << candidateNumber
2374 <<"isFake=" << isFake
2375 <<"config=" << config
2377 <<"chi2z=" << chi2[0]
2378 <<"chi2y=" << chi2[1]
2379 <<"Y2exp=" << cond2[0]
2380 <<"Z2exp=" << cond2[1]
2381 <<"X0=" << xpos[0] //layer[sLayer]->GetX()
2382 <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX()
2383 <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX()
2384 <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX()
2385 <<"yref0=" << yref[0]
2386 <<"yref1=" << yref[1]
2387 <<"yref2=" << yref[2]
2388 <<"yref3=" << yref[3]
2393 <<"Seed0.=" << &cseed[planes[0]]
2394 <<"Seed1.=" << &cseed[planes[1]]
2395 <<"Seed2.=" << &cseed[planes[2]]
2396 <<"Seed3.=" << &cseed[planes[3]]
2397 <<"RiemanFitter.=" << rim
2400 if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){
2401 // //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0]));
2402 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2405 if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){
2406 // //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1]));
2407 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2410 //AliInfo("Passed chi2 filter.");
2412 // try attaching clusters to tracklets
2415 for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){
2416 Int_t jLayer = planes[iLayer];
2417 if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue;
2418 nUsedCl += cseed[jLayer].GetNUsed();
2419 if(nUsedCl > 25) break;
2423 if(mlayers < kNSeedPlanes){
2424 //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes));
2425 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2429 // temporary exit door for the HLT
2430 if(fReconstructor->IsHLT()){
2431 // attach clusters to extrapolation chambers
2432 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2433 Int_t jLayer = planesExt[iLayer];
2434 if(!(chamber = stack[jLayer])) continue;
2435 cseed[jLayer].AttachClustersIter(chamber, 1000.);
2437 fTrackQuality[ntracks] = 1.; // dummy value
2439 if(ntracks == kMaxTracksStack) return ntracks;
2445 // fit tracklets and cook likelihood
2446 FitTiltedRieman(&cseed[0], kTRUE);// Update Seeds and calculate Likelihood
2447 Double_t like = CookLikelihood(&cseed[0], planes); // to be checked
2449 if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){
2450 //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2451 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2454 //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like));
2456 // book preliminary results
2457 seedQuality[ntracks] = like;
2458 fSeedLayer[ntracks] = config;/*sLayer;*/
2460 // attach clusters to the extrapolation seeds
2461 Int_t nusedf = 0; // debug value
2462 for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){
2463 Int_t jLayer = planesExt[iLayer];
2464 if(!(chamber = stack[jLayer])) continue;
2466 // fit extrapolated seed
2467 if ((jLayer == 0) && !(cseed[1].IsOK())) continue;
2468 if ((jLayer == 5) && !(cseed[4].IsOK())) continue;
2469 AliTRDseedV1 pseed = cseed[jLayer];
2470 if(!pseed.AttachClustersIter(chamber, 1000.)) continue;
2471 cseed[jLayer] = pseed;
2472 nusedf += cseed[jLayer].GetNUsed(); // debug value
2473 FitTiltedRieman(cseed, kTRUE);
2476 // AliInfo("Extrapolation done.");
2477 // Debug Stream containing all the 6 tracklets
2478 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
2479 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2480 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2481 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2482 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2483 cstreamer << "MakeSeeds1"
2484 << "EventNumber=" << eventNumber
2485 << "CandidateNumber=" << candidateNumber
2486 << "S0.=" << &cseed[0]
2487 << "S1.=" << &cseed[1]
2488 << "S2.=" << &cseed[2]
2489 << "S3.=" << &cseed[3]
2490 << "S4.=" << &cseed[4]
2491 << "S5.=" << &cseed[5]
2492 << "FitterT.=" << tiltedRieman
2496 if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){
2497 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2500 //AliInfo("Improve seed quality done.");
2502 // fit full track and cook likelihoods
2503 // Double_t curv = FitRieman(&cseed[0], chi2);
2504 // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.);
2505 // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.);
2507 // do the final track fitting (Once with vertex constraint and once without vertex constraint)
2508 Double_t chi2Vals[3];
2509 chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE);
2510 if(fReconstructor->GetRecoParam()->IsVertexConstrained())
2511 chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired
2514 chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.);
2515 // Chi2 definitions in testing stage
2516 //chi2Vals[2] = GetChi2ZTest(&cseed[0]);
2517 fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]);
2518 //AliInfo("Hyperplane fit done\n");
2520 // finalize tracklets
2524 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2525 if (!cseed[iLayer].IsOK()) continue;
2527 if (cseed[iLayer].GetLabels(0) >= 0) {
2528 labels[nlab] = cseed[iLayer].GetLabels(0);
2532 if (cseed[iLayer].GetLabels(1) >= 0) {
2533 labels[nlab] = cseed[iLayer].GetLabels(1);
2537 Freq(nlab,labels,outlab,kFALSE);
2538 Int_t label = outlab[0];
2539 Int_t frequency = outlab[1];
2540 for (Int_t iLayer = 0; iLayer < 6; iLayer++) {
2541 cseed[iLayer].SetFreq(frequency);
2542 cseed[iLayer].SetChi2Z(chi2[1]);
2545 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
2546 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2547 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2548 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2549 TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint();
2550 TLinearFitter *fitterT = GetTiltedRiemanFitter();
2552 for(Int_t iseed = 0; iseed < kNPlanes; iseed++){
2553 ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0;
2555 cstreamer << "MakeSeeds2"
2556 << "EventNumber=" << eventNumber
2557 << "CandidateNumber=" << candidateNumber
2558 << "Chi2TR=" << chi2Vals[0]
2559 << "Chi2TC=" << chi2Vals[1]
2560 << "Nlayers=" << mlayers
2561 << "NClusters=" << ncls
2562 << "NUsedS=" << nUsedCl
2563 << "NUsed=" << nusedf
2565 << "S0.=" << &cseed[0]
2566 << "S1.=" << &cseed[1]
2567 << "S2.=" << &cseed[2]
2568 << "S3.=" << &cseed[3]
2569 << "S4.=" << &cseed[4]
2570 << "S5.=" << &cseed[5]
2571 << "Label=" << label
2572 << "Freq=" << frequency
2573 << "FitterT.=" << fitterT
2574 << "FitterTC.=" << fitterTC
2579 AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1);
2580 if(ntracks == kMaxTracksStack){
2581 AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack));
2592 //_____________________________________________________________________________
2593 AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params)
2596 // Build a TRD track out of tracklet candidates
2599 // seeds : array of tracklets
2600 // params : track parameters (see MakeSeeds() function body for a detailed description)
2605 // Detailed description
2607 // To be discussed with Marian !!
2611 Double_t alpha = AliTRDgeometry::GetAlpha();
2612 Double_t shift = AliTRDgeometry::GetAlpha()/2.0;
2616 c[ 1] = 0.0; c[ 2] = 2.0;
2617 c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02;
2618 c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1;
2619 c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01;
2621 AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift);
2622 track.PropagateTo(params[0]-5.0);
2623 if(fReconstructor->IsHLT()){
2624 AliTRDseedV1 *ptrTracklet = 0x0;
2625 for(Int_t ip=0; ip<kNPlanes; ip++){
2626 track.UnsetTracklet(ip);
2627 ptrTracklet = SetTracklet(&seeds[ip]);
2628 track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1);
2630 return SetTrack(&track);
2633 track.ResetCovariance(1);
2634 Int_t nc = TMath::Abs(FollowBackProlongation(track));
2635 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){
2636 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2637 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2638 Double_t p[5]; // Track Params for the Debug Stream
2639 track.GetExternalParameters(params[0], p);
2640 TTreeSRedirector &cs = *fgDebugStreamer;
2642 << "EventNumber=" << eventNumber
2643 << "CandidateNumber=" << candidateNumber
2645 << "X=" << params[0]
2651 << "Yin=" << params[1]
2652 << "Zin=" << params[2]
2653 << "snpin=" << params[3]
2654 << "tndin=" << params[4]
2655 << "crvin=" << params[5]
2656 << "track.=" << &track
2659 if (nc < 30) return 0x0;
2661 AliTRDtrackV1 *ptrTrack = SetTrack(&track);
2662 ptrTrack->SetReconstructor(fReconstructor);
2663 ptrTrack->CookLabel(.9);
2665 // computes PID for track
2666 ptrTrack->CookPID();
2667 // update calibration references using this track
2668 AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance();
2670 AliInfo("Could not get Calibra instance\n");
2671 if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack);
2677 //____________________________________________________________________
2678 Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed)
2681 // Sort tracklets according to "quality" and try to "improve" the first 4 worst
2684 // layers : Array of propagation layers for a stack/supermodule
2685 // cseed : Array of 6 seeding tracklets which has to be improved
2688 // cssed : Improved seeds
2690 // Detailed description
2692 // Iterative procedure in which new clusters are searched for each
2693 // tracklet seed such that the seed quality (see AliTRDseed::GetQuality())
2694 // can be maximized. If some optimization is found the old seeds are replaced.
2699 // make a local working copy
2700 AliTRDtrackingChamber *chamber = 0x0;
2701 AliTRDseedV1 bseed[6];
2703 for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer];
2705 Float_t lastquality = 10000.0;
2706 Float_t lastchi2 = 10000.0;
2707 Float_t chi2 = 1000.0;
2709 for (Int_t iter = 0; iter < 4; iter++) {
2710 Float_t sumquality = 0.0;
2711 Float_t squality[6];
2712 Int_t sortindexes[6];
2714 for (Int_t jLayer = 0; jLayer < 6; jLayer++) {
2715 squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.;
2716 sumquality += squality[jLayer];
2718 if ((sumquality >= lastquality) || (chi2 > lastchi2)) break;
2721 lastquality = sumquality;
2723 if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer];
2725 TMath::Sort(6, squality, sortindexes, kFALSE);
2726 for (Int_t jLayer = 5; jLayer > 1; jLayer--) {
2727 Int_t bLayer = sortindexes[jLayer];
2728 if(!(chamber = stack[bLayer])) continue;
2729 bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE);
2730 if(bseed[bLayer].IsOK()) nLayers++;
2733 chi2 = FitTiltedRieman(bseed, kTRUE);
2734 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){
2735 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2736 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2737 TLinearFitter *tiltedRieman = GetTiltedRiemanFitter();
2738 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2739 cstreamer << "ImproveSeedQuality"
2740 << "EventNumber=" << eventNumber
2741 << "CandidateNumber=" << candidateNumber
2742 << "Iteration=" << iter
2743 << "S0.=" << &bseed[0]
2744 << "S1.=" << &bseed[1]
2745 << "S2.=" << &bseed[2]
2746 << "S3.=" << &bseed[3]
2747 << "S4.=" << &bseed[4]
2748 << "S5.=" << &bseed[5]
2749 << "FitterT.=" << tiltedRieman
2754 // we are sure that at least 2 tracklets are OK !
2758 //_________________________________________________________________________
2759 Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){
2761 // Calculates the Track Likelihood value. This parameter serves as main quality criterion for
2762 // the track selection
2763 // The likelihood value containes:
2764 // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit
2765 // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets
2766 // For all Parameters an exponential dependency is used
2768 // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate
2769 // - Array of chi2 values:
2770 // * Non-Constrained Tilted Riemann fit
2771 // * Vertex-Constrained Tilted Riemann fit
2772 // * z-Direction from Linear fit
2773 // Output: - The calculated track likelihood
2778 Double_t sumdaf = 0, nLayers = 0;
2779 for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) {
2780 if(!tracklets[iLayer].IsOK()) continue;
2781 sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2());
2784 sumdaf /= Float_t (nLayers - 2.0);
2786 Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z
2787 Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ?
2788 TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann
2789 Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann
2790 Double_t likeAF = TMath::Exp(-sumdaf * 3.23);
2791 Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF;
2793 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
2794 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2795 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2796 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2797 cstreamer << "CalculateTrackLikelihood0"
2798 << "EventNumber=" << eventNumber
2799 << "CandidateNumber=" << candidateNumber
2800 << "LikeChi2Z=" << likeChi2Z
2801 << "LikeChi2TR=" << likeChi2TR
2802 << "LikeChi2TC=" << likeChi2TC
2803 << "LikeAF=" << likeAF
2804 << "TrackLikelihood=" << trackLikelihood
2808 return trackLikelihood;
2811 //____________________________________________________________________
2812 Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4])
2815 // Calculate the probability of this track candidate.
2818 // cseeds : array of candidate tracklets
2819 // planes : array of seeding planes (see seeding configuration)
2820 // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track.
2825 // Detailed description
2827 // The track quality is estimated based on the following 4 criteria:
2828 // 1. precision of the rieman fit on the Y direction (likea)
2829 // 2. chi2 on the Y direction (likechi2y)
2830 // 3. chi2 on the Z direction (likechi2z)
2831 // 4. number of attached clusters compared to a reference value
2832 // (see AliTRDrecoParam::fkFindable) (likeN)
2834 // The distributions for each type of probabilities are given below as of
2835 // (date). They have to be checked to assure consistency of estimation.
2838 // ratio of the total number of clusters/track which are expected to be found by the tracker.
2839 const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam();
2841 Double_t chi2y = GetChi2Y(&cseed[0]);
2842 Double_t chi2z = GetChi2Z(&cseed[0]);
2844 Float_t nclusters = 0.;
2845 Double_t sumda = 0.;
2846 for(UChar_t ilayer = 0; ilayer < 4; ilayer++){
2847 Int_t jlayer = planes[ilayer];
2848 nclusters += cseed[jlayer].GetN2();
2849 sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1));
2853 Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiCut());
2854 Double_t likechi2y = 0.0000000001;
2855 if (fReconstructor->IsCosmic() || chi2y < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YCut());
2856 Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZCut());
2857 Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters());
2858 Double_t like = likea * likechi2y * likechi2z * likeN;
2860 // AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN));
2861 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){
2862 Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber();
2863 Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber();
2864 Int_t nTracklets = 0; Float_t mean_ncls = 0;
2865 for(Int_t iseed=0; iseed < kNPlanes; iseed++){
2866 if(!cseed[iseed].IsOK()) continue;
2868 mean_ncls += cseed[iseed].GetN2();
2870 if(nTracklets) mean_ncls /= nTracklets;
2871 // The Debug Stream contains the seed
2872 TTreeSRedirector &cstreamer = *fgDebugStreamer;
2873 cstreamer << "CookLikelihood"
2874 << "EventNumber=" << eventNumber
2875 << "CandidateNumber=" << candidateNumber
2876 << "tracklet0.=" << &cseed[0]
2877 << "tracklet1.=" << &cseed[1]
2878 << "tracklet2.=" << &cseed[2]
2879 << "tracklet3.=" << &cseed[3]
2880 << "tracklet4.=" << &cseed[4]
2881 << "tracklet5.=" << &cseed[5]
2882 << "sumda=" << sumda
2883 << "chi2y=" << chi2y
2884 << "chi2z=" << chi2z
2885 << "likea=" << likea
2886 << "likechi2y=" << likechi2y
2887 << "likechi2z=" << likechi2z
2888 << "nclusters=" << nclusters
2889 << "likeN=" << likeN
2891 << "meanncls=" << mean_ncls
2900 //____________________________________________________________________
2901 void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4])
2904 // Map seeding configurations to detector planes.
2907 // iconfig : configuration index
2908 // planes : member planes of this configuration. On input empty.
2911 // planes : contains the planes which are defining the configuration
2913 // Detailed description
2915 // Here is the list of seeding planes configurations together with
2916 // their topological classification:
2934 // The topologic quality is modeled as follows:
2935 // 1. The general model is define by the equation:
2936 // p(conf) = exp(-conf/2)
2937 // 2. According to the topologic classification, configurations from the same
2938 // class are assigned the agerage value over the model values.
2939 // 3. Quality values are normalized.
2941 // The topologic quality distribution as function of configuration is given below:
2943 // <img src="gif/topologicQA.gif">
2948 case 0: // 5432 TQ 0
2954 case 1: // 4321 TQ 0
2960 case 2: // 3210 TQ 0
2966 case 3: // 5321 TQ 1
2972 case 4: // 4210 TQ 1
2978 case 5: // 5431 TQ 1
2984 case 6: // 4320 TQ 1
2990 case 7: // 5430 TQ 2
2996 case 8: // 5210 TQ 2
3002 case 9: // 5421 TQ 3
3008 case 10: // 4310 TQ 3
3014 case 11: // 5410 TQ 4
3020 case 12: // 5420 TQ 5
3026 case 13: // 5320 TQ 5
3032 case 14: // 5310 TQ 5
3041 //____________________________________________________________________
3042 void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2])
3045 // Returns the extrapolation planes for a seeding configuration.
3048 // iconfig : configuration index
3049 // planes : planes which are not in this configuration. On input empty.
3052 // planes : contains the planes which are not in the configuration
3054 // Detailed description
3058 case 0: // 5432 TQ 0
3062 case 1: // 4321 TQ 0
3066 case 2: // 3210 TQ 0
3070 case 3: // 5321 TQ 1
3074 case 4: // 4210 TQ 1
3078 case 5: // 5431 TQ 1
3082 case 6: // 4320 TQ 1
3086 case 7: // 5430 TQ 2
3090 case 8: // 5210 TQ 2
3094 case 9: // 5421 TQ 3
3098 case 10: // 4310 TQ 3
3102 case 11: // 5410 TQ 4
3106 case 12: // 5420 TQ 5
3110 case 13: // 5320 TQ 5
3114 case 14: // 5310 TQ 5
3121 //____________________________________________________________________
3122 AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const
3124 Int_t ncls = fClusters->GetEntriesFast();
3125 return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0;
3128 //____________________________________________________________________
3129 AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const
3131 Int_t ntrklt = fTracklets->GetEntriesFast();
3132 return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0;
3135 //____________________________________________________________________
3136 AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const
3138 Int_t ntrk = fTracks->GetEntriesFast();
3139 return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0;
3142 //____________________________________________________________________
3143 Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){
3145 // Calculates the reference x-position for the tilted Rieman fit defined as middle
3146 // of the stack (middle between layers 2 and 3). For the calculation all the tracklets
3147 // are taken into account
3149 // Parameters: - Array of tracklets(AliTRDseedV1)
3151 // Output: - The reference x-position(Float_t)
3153 Int_t nDistances = 0;
3154 Float_t meanDistance = 0.;
3155 Int_t startIndex = 5;
3156 for(Int_t il =5; il > 0; il--){
3157 if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){
3158 Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0();
3159 meanDistance += xdiff;
3162 if(tracklets[il].IsOK()) startIndex = il;
3164 if(tracklets[0].IsOK()) startIndex = 0;
3166 // We should normally never get here
3167 Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2);
3168 Int_t iok = 0, idiff = 0;
3169 // This attempt is worse and should be avoided:
3170 // check for two chambers which are OK and repeat this without taking the mean value
3171 // Strategy avoids a division by 0;
3172 for(Int_t il = 5; il >= 0; il--){
3173 if(tracklets[il].IsOK()){
3174 xpos[iok] = tracklets[il].GetX0();
3178 if(iok) idiff++; // to get the right difference;
3182 meanDistance = (xpos[0] - xpos[1])/idiff;
3185 // we have do not even have 2 layers which are OK? The we do not need to fit at all
3190 meanDistance /= nDistances;
3192 return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick());
3195 //_____________________________________________________________________________
3196 Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist
3197 , Int_t *outlist, Bool_t down)
3200 // Sort eleements according occurancy
3201 // The size of output array has is 2*n
3208 Int_t *sindexS = new Int_t[n]; // Temporary array for sorting
3209 Int_t *sindexF = new Int_t[2*n];
3210 for (Int_t i = 0; i < n; i++) {
3214 TMath::Sort(n,inlist,sindexS,down);
3216 Int_t last = inlist[sindexS[0]];
3219 sindexF[0+n] = last;
3223 for (Int_t i = 1; i < n; i++) {
3224 val = inlist[sindexS[i]];
3226 sindexF[countPos]++;
3230 sindexF[countPos+n] = val;
3231 sindexF[countPos]++;
3239 // Sort according frequency
3240 TMath::Sort(countPos,sindexF,sindexS,kTRUE);
3242 for (Int_t i = 0; i < countPos; i++) {
3243 outlist[2*i ] = sindexF[sindexS[i]+n];
3244 outlist[2*i+1] = sindexF[sindexS[i]];
3255 //____________________________________________________________________
3256 void AliTRDtrackerV1::SetReconstructor(const AliTRDReconstructor *rec)
3258 fReconstructor = rec;
3259 if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){
3260 if(!fgDebugStreamer){
3261 TDirectory *savedir = gDirectory;
3262 fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root");
3268 //_____________________________________________________________________________
3269 Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const
3271 // Chi2 definition on y-direction
3274 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3275 if(!tracklets[ipl].IsOK()) continue;
3276 Double_t distLayer = (tracklets[ipl].GetYfit(0) - tracklets[ipl].GetYref(0));// /tracklets[ipl].GetSigmaY();
3277 chi2 += distLayer * distLayer;
3282 //____________________________________________________________________
3283 void AliTRDtrackerV1::ResetSeedTB()
3285 // reset buffer for seeding time bin layers. If the time bin
3286 // layers are not allocated this function allocates them
3288 for(Int_t isl=0; isl<kNSeedPlanes; isl++){
3289 if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin();
3290 else fSeedTB[isl]->Clear();
3294 //_____________________________________________________________________________
3295 Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const
3297 // Calculates normalized chi2 in z-direction
3300 // chi2 = Sum ((z - zmu)/sigma)^2
3301 // Sigma for the z direction is defined as half of the padlength
3302 for(Int_t ipl = 0; ipl < kNPlanes; ipl++){
3303 if(!tracklets[ipl].IsOK()) continue;
3304 Double_t distLayer = (tracklets[ipl].GetMeanz() - tracklets[ipl].GetZref(0)); // /(tracklets[ipl].GetPadLength()/2);
3305 chi2 += distLayer * distLayer;
3310 ///////////////////////////////////////////////////////
3312 // Resources of class AliTRDLeastSquare //
3314 ///////////////////////////////////////////////////////
3316 //_____________________________________________________________________________
3317 AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){
3319 // Constructor of the nested class AliTRDtrackFitterLeastSquare
3321 memset(fParams, 0, sizeof(Double_t) * 2);
3322 memset(fSums, 0, sizeof(Double_t) * 5);
3323 memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3);
3327 //_____________________________________________________________________________
3328 void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){
3330 // Adding Point to the fitter
3332 Double_t weight = 1/(sigmaY * sigmaY);
3334 // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY);
3336 fSums[1] += weight * xpt;
3337 fSums[2] += weight * y;
3338 fSums[3] += weight * xpt * y;
3339 fSums[4] += weight * xpt * xpt;
3340 fSums[5] += weight * y * y;
3343 //_____________________________________________________________________________
3344 void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){
3346 // Remove Point from the sample
3348 Double_t weight = 1/(sigmaY * sigmaY);
3351 fSums[1] -= weight * xpt;
3352 fSums[2] -= weight * y;
3353 fSums[3] -= weight * xpt * y;
3354 fSums[4] -= weight * xpt * xpt;
3355 fSums[5] -= weight * y * y;
3358 //_____________________________________________________________________________
3359 void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){
3361 // Evaluation of the fit:
3362 // Calculation of the parameters
3363 // Calculation of the covariance matrix
3366 Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1];
3367 if(denominator==0) return;
3369 // for(Int_t isum = 0; isum < 5; isum++)
3370 // printf("fSums[%d] = %f\n", isum, fSums[isum]);
3371 // printf("denominator = %f\n", denominator);
3372 fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator;
3373 fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator;
3374 // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]);
3376 // Covariance matrix
3377 fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0];
3378 fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0];
3379 fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0];
3382 //_____________________________________________________________________________
3383 Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const {
3385 // Returns the Function value of the fitted function at a given x-position
3387 return fParams[0] + fParams[1] * (*xpos);
3390 //_____________________________________________________________________________
3391 void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const {
3393 // Copies the values of the covariance matrix into the storage
3395 memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3);