1 /**************************************************************************
2 * Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 //_________________________________________________________________________
18 // Implementation of the ITS-SPD trackleter class
20 // It retrieves clusters in the pixels (theta and phi) and finds tracklets.
21 // These can be used to extract charged particle multiplicity from the ITS.
23 // A tracklet consists of two ITS clusters, one in the first pixel layer and
24 // one in the second. The clusters are associated if the differences in
25 // Phi (azimuth) and Theta (polar angle) are within fiducial windows.
26 // In case of multiple candidates the candidate with minimum
27 // distance is selected.
29 // Two methods return the number of tracklets and the number of unassociated
30 // clusters (i.e. not used in any tracklet) in the first SPD layer
31 // (GetNTracklets and GetNSingleClusters)
33 // The cuts on phi and theta depend on the interacting system (p-p or Pb-Pb)
34 // and can be set via AliITSRecoParam class
35 // (SetPhiWindow and SetThetaWindow)
37 // Origin: Tiziano Virgili
39 // Current support and development:
40 // Domenico Elia, Maria Nicassio (INFN Bari)
41 // Domenico.Elia@ba.infn.it, Maria.Nicassio@ba.infn.it
43 // Most recent updates:
44 // - multiple association forbidden (fOnlyOneTrackletPerC2 = kTRUE)
45 // - phi definition changed to ALICE convention (0,2*TMath::pi())
46 // - cluster coordinates taken with GetGlobalXYZ()
47 // - fGeometry removed
48 // - number of fired chips on the two layers
49 // - option to cut duplicates in the overlaps
50 // - options and fiducial cuts via AliITSRecoParam
51 // - move from DeltaZeta to DeltaTheta cut
52 // - update to the new algorithm by Mariella and Jan Fiete
53 // - store also DeltaTheta in the ESD
54 // - less new and delete calls when creating the needed arrays
56 // - RS: to decrease the number of new/deletes the clusters data are stored
57 // not in float[6] attached to float**, but in 1-D array.
58 // - RS: Clusters are sorted in Z in roder to have the same numbering as in the ITS reco
59 // - RS: Clusters used by ESDtrack are flagged, this information is passed to AliMulitiplicity object
60 // when storing the tracklets and single cluster info
61 // - MN: first MC label of single clusters stored
62 //_________________________________________________________________________
64 #include <TClonesArray.h>
72 #include "AliITSMultReconstructor.h"
73 #include "AliITSReconstructor.h"
74 #include "AliITSRecPoint.h"
75 #include "AliITSRecPointContainer.h"
76 #include "AliITSgeom.h"
77 #include "AliITSgeomTGeo.h"
78 #include "AliITSDetTypeRec.h"
79 #include "AliESDEvent.h"
80 #include "AliESDVertex.h"
81 #include "AliESDtrack.h"
82 #include "AliMultiplicity.h"
84 #include "TGeoGlobalMagField.h"
88 #include "AliKFParticle.h"
89 #include "AliKFVertex.h"
90 #include "AliRefArray.h"
92 //____________________________________________________________________
93 ClassImp(AliITSMultReconstructor)
96 //____________________________________________________________________
97 AliITSMultReconstructor::AliITSMultReconstructor():
98 fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0),
106 fRemoveClustersFromOverlaps(0),
109 fPhiRotationAngle(0),
115 fCutPxDrSPDout(0.15),
118 fCutMinElectronProbTPC(0.5),
119 fCutMinElectronProbESD(0.1),
123 fCutMinPointAngle(0.98),
124 fCutMaxDCADauther(0.5),
126 fCutMassGammaNSigma(5.),
128 fCutMassK0NSigma(5.),
131 fCutGammaSFromDecay(-10.),
132 fCutK0SFromDecay(-10.),
136 fhClustersDPhiAcc(0),
137 fhClustersDThetaAcc(0),
138 fhClustersDPhiAll(0),
139 fhClustersDThetaAll(0),
140 fhDPhiVsDThetaAll(0),
141 fhDPhiVsDThetaAcc(0),
144 fhetaClustersLay1(0),
145 fhphiClustersLay1(0),
155 fCreateClustersCopy(0),
162 for (int i=0;i<2;i++) {
165 for (int j=0;j<2;j++) fUsedClusLay[i][j] = 0;
166 fDetectorIndexClustersLay[i] = 0;
167 fClusterCopyIndex[i] = 0;
168 fOverlapFlagClustersLay[i] = 0;
169 fNClustersLay[i] = 0;
172 // Method to reconstruct the charged particles multiplicity with the
177 if (AliITSReconstructor::GetRecoParam()) {
178 SetPhiWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiWindow());
179 SetThetaWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterThetaWindow());
180 SetPhiShift(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiShift());
181 SetRemoveClustersFromOverlaps(AliITSReconstructor::GetRecoParam()->GetTrackleterRemoveClustersFromOverlaps());
182 SetPhiOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiOverlapCut());
183 SetZetaOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterZetaOverlapCut());
184 SetPhiRotationAngle(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiRotationAngle());
185 SetNStdDev(AliITSReconstructor::GetRecoParam()->GetTrackleterNStdDevCut());
186 SetScaleDThetaBySin2T(AliITSReconstructor::GetRecoParam()->GetTrackleterScaleDThetaBySin2T());
187 SetBuildRefs(AliITSReconstructor::GetRecoParam()->GetTrackleterBuildCl2TrkRefs());
189 SetCutPxDrSPDin(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDin());
190 SetCutPxDrSPDout(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDout());
191 SetCutPxDz(AliITSReconstructor::GetRecoParam()->GetMultCutPxDz());
192 SetCutDCArz(AliITSReconstructor::GetRecoParam()->GetMultCutDCArz());
193 SetCutMinElectronProbTPC(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbTPC());
194 SetCutMinElectronProbESD(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbESD());
195 SetCutMinP(AliITSReconstructor::GetRecoParam()->GetMultCutMinP());
196 SetCutMinRGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMinRGamma());
197 SetCutMinRK0(AliITSReconstructor::GetRecoParam()->GetMultCutMinRK0());
198 SetCutMinPointAngle(AliITSReconstructor::GetRecoParam()->GetMultCutMinPointAngle());
199 SetCutMaxDCADauther(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCADauther());
200 SetCutMassGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGamma());
201 SetCutMassGammaNSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGammaNSigma());
202 SetCutMassK0(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0());
203 SetCutMassK0NSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0NSigma());
204 SetCutChi2cGamma(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cGamma());
205 SetCutChi2cK0(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cK0());
206 SetCutGammaSFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutGammaSFromDecay());
207 SetCutK0SFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutK0SFromDecay());
208 SetCutMaxDCA(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCA());
214 SetRemoveClustersFromOverlaps();
217 SetPhiRotationAngle();
224 SetCutMinElectronProbTPC();
225 SetCutMinElectronProbESD();
229 SetCutMinPointAngle();
230 SetCutMaxDCADauther();
232 SetCutMassGammaNSigma();
234 SetCutMassK0NSigma();
237 SetCutGammaSFromDecay();
238 SetCutK0SFromDecay();
245 // definition of histograms
246 Bool_t oldStatus = TH1::AddDirectoryStatus();
247 TH1::AddDirectory(kFALSE);
249 fhClustersDPhiAcc = new TH1F("dphiacc", "dphi", 100,-0.1,0.1);
250 fhClustersDThetaAcc = new TH1F("dthetaacc","dtheta",100,-0.1,0.1);
252 fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",100,-0.1,0.1,100,-0.1,0.1);
254 fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,0.0,0.5);
255 fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,0.0,0.5);
257 fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,0.,0.5,100,0.,0.5);
259 fhetaTracklets = new TH1F("etaTracklets", "eta", 100,-2.,2.);
260 fhphiTracklets = new TH1F("phiTracklets", "phi", 100, 0., 2*TMath::Pi());
261 fhetaClustersLay1 = new TH1F("etaClustersLay1", "etaCl1", 100,-2.,2.);
262 fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100, 0., 2*TMath::Pi());
263 for (int i=2;i--;) fStoreRefs[i][0] = fStoreRefs[i][1] = kFALSE;
264 TH1::AddDirectory(oldStatus);
267 //______________________________________________________________________
268 AliITSMultReconstructor::AliITSMultReconstructor(const AliITSMultReconstructor &mr) :
270 fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0),
278 fRemoveClustersFromOverlaps(0),
281 fPhiRotationAngle(0),
287 fCutPxDrSPDout(0.15),
290 fCutMinElectronProbTPC(0.5),
291 fCutMinElectronProbESD(0.1),
295 fCutMinPointAngle(0.98),
296 fCutMaxDCADauther(0.5),
298 fCutMassGammaNSigma(5.),
300 fCutMassK0NSigma(5.),
303 fCutGammaSFromDecay(-10.),
304 fCutK0SFromDecay(-10.),
308 fhClustersDPhiAcc(0),
309 fhClustersDThetaAcc(0),
310 fhClustersDPhiAll(0),
311 fhClustersDThetaAll(0),
312 fhDPhiVsDThetaAll(0),
313 fhDPhiVsDThetaAcc(0),
316 fhetaClustersLay1(0),
317 fhphiClustersLay1(0),
326 fCreateClustersCopy(0),
332 // Copy constructor :!!! RS ATTENTION: old c-tor reassigned the pointers instead of creating a new copy -> would crash on delete
333 AliError("May not use");
336 //______________________________________________________________________
337 AliITSMultReconstructor& AliITSMultReconstructor::operator=(const AliITSMultReconstructor& mr){
338 // Assignment operator
340 this->~AliITSMultReconstructor();
341 new(this) AliITSMultReconstructor(mr);
346 //______________________________________________________________________
347 AliITSMultReconstructor::~AliITSMultReconstructor(){
351 delete fhClustersDPhiAcc;
352 delete fhClustersDThetaAcc;
353 delete fhClustersDPhiAll;
354 delete fhClustersDThetaAll;
355 delete fhDPhiVsDThetaAll;
356 delete fhDPhiVsDThetaAcc;
357 delete fhetaTracklets;
358 delete fhphiTracklets;
359 delete fhetaClustersLay1;
360 delete fhphiClustersLay1;
363 for(Int_t i=0; i<fNTracklets; i++) delete [] fTracklets[i];
365 for(Int_t i=0; i<fNSingleCluster; i++) delete [] fSClusters[i];
368 for (int i=0;i<2;i++) {
369 delete[] fClustersLay[i];
370 delete[] fDetectorIndexClustersLay[i];
371 delete[] fClusterCopyIndex[i];
372 delete[] fOverlapFlagClustersLay[i];
374 for (int j=0;j<2;j++) delete fUsedClusLay[i][j];
376 delete [] fTracklets;
377 delete [] fSClusters;
379 delete[] fPartners; fPartners = 0;
380 delete[] fMinDists; fMinDists = 0;
381 delete fBlackList; fBlackList = 0;
385 //____________________________________________________________________
386 void AliITSMultReconstructor::Reconstruct(AliESDEvent* esd, TTree* treeRP)
388 if (!treeRP) { AliError(" Invalid ITS cluster tree !\n"); return; }
389 if (!esd) {AliError("ESDEvent is not available, use old reconstructor"); return;}
391 if (fMult) delete fMult; fMult = 0;
392 fNClustersLay[0] = 0;
393 fNClustersLay[1] = 0;
400 // >>>> RS: this part is equivalent to former AliITSVertexer::FindMultiplicity
402 // see if there is a SPD vertex
403 Bool_t isVtxOK=kTRUE, isCosmics=kFALSE;
404 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
405 if (!vtx || vtx->GetNContributors()<1) isVtxOK = kFALSE;
406 if (vtx && strstr(vtx->GetTitle(),"cosmics")) {
413 AliDebug(1,"Tracklets multiplicity not determined because the primary vertex was not found");
414 AliDebug(1,"Just counting the number of cluster-fired chips on the SPD layers");
419 float vtxf[3] = {vtx->GetX(),vtx->GetY(),vtx->GetZ()};
426 CreateMultiplicityObject();
429 //____________________________________________________________________
430 void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
432 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
434 if (fMult) delete fMult; fMult = 0;
435 fNClustersLay[0] = 0;
436 fNClustersLay[1] = 0;
440 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
443 SetTreeRP(clusterTree);
450 //____________________________________________________________________
451 void AliITSMultReconstructor::ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, const Float_t* vtx, Float_t*)
454 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
456 if (fMult) delete fMult; fMult = 0;
457 fNClustersLay[0] = 0;
458 fNClustersLay[1] = 0;
462 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
463 if (!clusterTreeMix) { AliError(" Invalid ITS cluster tree 2nd event !\n"); return; }
466 SetTreeRP(clusterTree);
467 SetTreeRPMix(clusterTreeMix);
474 //____________________________________________________________________
475 void AliITSMultReconstructor::FindTracklets(const Float_t *vtx)
477 // - calls LoadClusterArrays that finds the position of the clusters
480 // - convert the cluster coordinates to theta, phi (seen from the
481 // interaction vertex). Clusters in the inner layer can be now
482 // rotated for combinatorial studies
483 // - makes an array of tracklets
485 // After this method has been called, the clusters of the two layers
486 // and the tracklets can be retrieved by calling the Get'er methods.
489 // Find tracklets converging to vertex
491 LoadClusterArrays(fTreeRP,fTreeRPMix);
492 // flag clusters used by ESD tracks
493 if (fESDEvent) ProcessESDTracks();
500 // find the tracklets
501 AliDebug(1,"Looking for tracklets... ");
503 ClusterPos2Angles(vtx); // convert cluster position to angles wrt vtx
505 // Step1: find all tracklets allowing double assocation:
509 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) found += AssociateClusterOfL1(iC1);
512 // Step2: store tracklets; remove used clusters
513 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) StoreTrackletForL2Cluster(iC2);
515 // store unused single clusters of L1
518 AliDebug(1,Form("%d tracklets found", fNTracklets));
521 //____________________________________________________________________
522 void AliITSMultReconstructor::CreateMultiplicityObject()
524 // create AliMultiplicity object and store it in the ESD event
526 TBits fastOrFiredMap,firedChipMap;
528 fastOrFiredMap = fDetTypeRec->GetFastOrFiredMap();
529 firedChipMap = fDetTypeRec->GetFiredChipMap(fTreeRP);
532 fMult = new AliMultiplicity(fNTracklets,fNSingleCluster,fNFiredChips[0],fNFiredChips[1],fastOrFiredMap);
533 fMult->SetMultTrackRefs( fBuildRefs );
534 // store some details of reco:
535 fMult->SetScaleDThetaBySin2T(fScaleDTBySin2T);
536 fMult->SetDPhiWindow2(fDPhiWindow2);
537 fMult->SetDThetaWindow2(fDThetaWindow2);
538 fMult->SetDPhiShift(fDPhiShift);
539 fMult->SetNStdDev(fNStdDev);
541 fMult->SetFiredChipMap(firedChipMap);
542 AliITSRecPointContainer* rcont = AliITSRecPointContainer::Instance();
543 fMult->SetITSClusters(0,rcont->GetNClustersInLayer(1,fTreeRP));
544 for(Int_t kk=2;kk<=6;kk++) fMult->SetITSClusters(kk-1,rcont->GetNClustersInLayerFast(kk));
547 AliRefArray *refs[2][2] = {{0,0},{0,0}};
550 for (int it=2;it--;) // tracklet_clusters->track references to stor
551 if (fStoreRefs[il][it]) refs[il][it] = new AliRefArray(fNTracklets,0);
554 for (int i=fNTracklets;i--;) {
555 float* tlInfo = fTracklets[i];
556 fMult->SetTrackletData(i,tlInfo);
558 if (!fBuildRefs) continue; // do we need references?
559 for (int itp=0;itp<2;itp++) {
560 for (int ilr=0;ilr<2;ilr++) {
561 if (!fStoreRefs[ilr][itp]) continue; // nothing to store
562 int clID = int(tlInfo[ilr ? kClID2:kClID1]);
563 int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100);
565 else if (nref==1) refs[ilr][itp]->AddReference(i,shared[0]);
566 else refs[ilr][itp]->AddReferences(i,shared,nref);
570 if (fBuildRefs) fMult->AttachTracklet2TrackRefs(refs[0][0],refs[0][1],refs[1][0],refs[1][1]);
572 AliRefArray *refsc[2] = {0,0};
573 if (fBuildRefs) for (int it=2;it--;) if (fStoreRefs[0][it]) refsc[it] = new AliRefArray(fNClustersLay[0]);
574 for (int i=fNSingleCluster;i--;) {
575 float* clInfo = fSClusters[i];
576 fMult->SetSingleClusterData(i,clInfo);
578 if (!fBuildRefs) continue; // do we need references?
579 int clID = int(clInfo[kSCID]);
580 for (int itp=0;itp<2;itp++) {
581 if (!fStoreRefs[0][itp]) continue;
582 int nref = fUsedClusLay[0][itp]->GetReferences(clID,shared,100);
584 else if (nref==1) refsc[itp]->AddReference(i,shared[0]);
585 else refsc[itp]->AddReferences(i,shared,nref);
588 if (fBuildRefs) fMult->AttachCluster2TrackRefs(refsc[0],refsc[1]);
589 fMult->CompactBits();
594 //____________________________________________________________________
595 void AliITSMultReconstructor::LoadClusterArrays(TTree* tree, TTree* treeMix)
597 // load cluster info and prepare tracklets arrays
599 if (AreClustersLoaded()) {AliInfo("Clusters are already loaded"); return;}
600 LoadClusterArrays(tree,0);
601 LoadClusterArrays(treeMix ? treeMix:tree,1);
602 int nmaxT = TMath::Min(fNClustersLay[0], fNClustersLay[1]);
603 if (fTracklets) delete[] fTracklets;
604 fTracklets = new Float_t*[nmaxT];
605 memset(fTracklets,0,nmaxT*sizeof(Float_t*));
607 if (fSClusters) delete[] fSClusters;
608 fSClusters = new Float_t*[fNClustersLay[0]];
609 memset(fSClusters,0,fNClustersLay[0]*sizeof(Float_t*));
611 AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay[0],fNClustersLay[1]));
612 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
616 //____________________________________________________________________
617 void AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree, int il)
620 // - gets the clusters from the cluster tree for layer il
621 // - convert them into global coordinates
622 // - store them in the internal arrays
623 // - count the number of cluster-fired chips
625 // RS: This method was strongly modified wrt original. In order to have the same numbering
626 // of clusters as in the ITS reco I had to introduce sorting in Z
627 // Also note that now the clusters data are stored not in float[6] attached to float**, but in 1-D array
628 AliDebug(1,Form("Loading clusters and cluster-fired chips for layer %d",il));
630 fNClustersLay[il] = 0;
631 fNFiredChips[il] = 0;
632 for (int i=2;i--;) fStoreRefs[il][i] = kFALSE;
634 AliITSRecPointContainer* rpcont = 0;
635 static TClonesArray statITSrec("AliITSRecPoint");
636 static TObjArray clArr(100);
638 TClonesArray* itsClusters = 0;
640 if (!fCreateClustersCopy) {
641 rpcont=AliITSRecPointContainer::Instance();
642 itsClusters = rpcont->FetchClusters(0,itsClusterTree);
643 if(!rpcont->IsSPDActive()){
644 AliWarning("No SPD rec points found, multiplicity not calculated");
649 itsClusters = &statITSrec;
650 branch = itsClusterTree->GetBranch("ITSRecPoints");
651 branch->SetAddress(&itsClusters);
652 if (!fClArr[il]) fClArr[il] = new TClonesArray("AliITSRecPoint",100);
653 delete[] fClusterCopyIndex[il];
657 // loop over the SPD subdetectors
659 int detMin = TMath::Max(0,AliITSgeomTGeo::GetModuleIndex(il+1,1,1));
660 int detMax = AliITSgeomTGeo::GetModuleIndex(il+2,1,1);
661 for (int idt=detMin;idt<detMax;idt++) {
662 if (!fCreateClustersCopy) itsClusters = rpcont->UncheckedGetClusters(idt);
663 else branch->GetEvent(idt);
664 int nClusters = itsClusters->GetEntriesFast();
665 if (!nClusters) continue;
666 Int_t nClustersInChip[5] = {0,0,0,0,0};
668 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
669 if (!cluster) continue;
670 if (fCreateClustersCopy) cluster = new ((*fClArr[il])[nclLayer]) AliITSRecPoint(*cluster);
671 clArr.AddAtAndExpand(cluster,nclLayer++);
672 Int_t chipNo = fSPDSeg.GetChipFromLocal(0,cluster->GetDetLocalZ());
673 if(chipNo>=0)nClustersInChip[ chipNo ]++;
675 for(Int_t ifChip=5;ifChip--;) if (nClustersInChip[ifChip]) fNFiredChips[il]++;
677 // sort the clusters in Z (to have the same numbering as in ITS reco
678 Float_t *z = new Float_t[nclLayer];
679 Int_t *index = new Int_t[nclLayer];
680 for (int ic=0;ic<nclLayer;ic++) z[ic] = ((AliITSRecPoint*)clArr[ic])->GetZ();
681 TMath::Sort(nclLayer,z,index,kFALSE);
682 Float_t* clustersLay = new Float_t[nclLayer*kClNPar];
683 Int_t* detectorIndexClustersLay = new Int_t[nclLayer];
684 Bool_t* overlapFlagClustersLay = new Bool_t[nclLayer];
685 if (fCreateClustersCopy) fClusterCopyIndex[il] = new Int_t[nclLayer];
687 for (int ic=0;ic<nclLayer;ic++) {
688 AliITSRecPoint* cluster = (AliITSRecPoint*)clArr[index[ic]];
689 float* clPar = &clustersLay[ic*kClNPar];
691 cluster->GetGlobalXYZ( clPar );
692 detectorIndexClustersLay[ic] = cluster->GetDetectorIndex();
693 overlapFlagClustersLay[ic] = kFALSE;
694 for (Int_t i=3;i--;) clPar[kClMC0+i] = cluster->GetLabel(i);
695 if (fCreateClustersCopy) fClusterCopyIndex[il][ic] = index[ic];
701 if (fOverlapFlagClustersLay[il]) delete[] fOverlapFlagClustersLay[il];
702 fOverlapFlagClustersLay[il] = overlapFlagClustersLay;
704 if (fDetectorIndexClustersLay[il]) delete[] fDetectorIndexClustersLay[il];
705 fDetectorIndexClustersLay[il] = detectorIndexClustersLay;
708 for (int it=0;it<2;it++) {
709 if (fUsedClusLay[il][it]) delete fUsedClusLay[il][it];
710 fUsedClusLay[il][it] = new AliRefArray(nclLayer);
714 if (fClustersLay[il]) delete[] fClustersLay[il];
715 fClustersLay[il] = clustersLay;
716 fNClustersLay[il] = nclLayer;
720 //____________________________________________________________________
721 void AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) {
723 // - gets the clusters from the cluster tree
724 // - counts the number of (cluster)fired chips
726 AliDebug(1,"Loading cluster-fired chips ...");
731 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
732 TClonesArray* itsClusters=NULL;
733 rpcont->FetchClusters(0,itsClusterTree);
734 if(!rpcont->IsSPDActive()){
735 AliWarning("No SPD rec points found, multiplicity not calculated");
739 // loop over the its subdetectors
740 Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1);
741 for (Int_t iIts=0; iIts < nSPDmodules; iIts++) {
742 itsClusters=rpcont->UncheckedGetClusters(iIts);
743 Int_t nClusters = itsClusters->GetEntriesFast();
745 // number of clusters in each chip of the current module
746 Int_t nClustersInChip[5] = {0,0,0,0,0};
750 AliITSgeomTGeo::GetModuleId(iIts,layer,ladder,det);
751 --layer; // layer is from 1 to 6 in AliITSgeomTGeo, but from 0 to 5 here
752 if(layer<0 || layer >1)continue;
754 // loop over clusters
756 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
758 // find the chip for the current cluster
759 Float_t locz = cluster->GetDetLocalZ();
760 Int_t iChip = fSPDSeg.GetChipFromLocal(0,locz);
761 if (iChip>=0) nClustersInChip[iChip]++;
763 }// end of cluster loop
765 // get number of fired chips in the current module
766 for(Int_t ifChip=0; ifChip<5; ifChip++) {
767 if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
770 } // end of its "subdetector" loop
773 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
775 //____________________________________________________________________
777 AliITSMultReconstructor::SaveHists() {
778 // This method save the histograms on the output file
779 // (only if fHistOn is TRUE).
784 fhClustersDPhiAll->Write();
785 fhClustersDThetaAll->Write();
786 fhDPhiVsDThetaAll->Write();
788 fhClustersDPhiAcc->Write();
789 fhClustersDThetaAcc->Write();
790 fhDPhiVsDThetaAcc->Write();
792 fhetaTracklets->Write();
793 fhphiTracklets->Write();
794 fhetaClustersLay1->Write();
795 fhphiClustersLay1->Write();
798 //____________________________________________________________________
799 void AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist)
801 // Flags clusters in the overlapping regions
802 Float_t distClSameMod=0.;
803 Float_t distClSameModMin=0.;
805 Float_t meanRadiusLay1 = 3.99335; // average radius inner layer
806 Float_t meanRadiusLay2 = 7.37935; // average radius outer layer;
811 Float_t* clPar1 = GetClusterLayer1(iC1);
812 Float_t* clPar2B = GetClusterLayer2(iC2WithBestDist);
813 // Loop on inner layer clusters
814 for (Int_t iiC1=0; iiC1<fNClustersLay[0]; iiC1++) {
815 if (!fOverlapFlagClustersLay[0][iiC1]) {
816 // only for adjacent modules
817 if ((TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==4)||
818 (TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==76)) {
819 Float_t *clPar11 = GetClusterLayer1(iiC1);
820 Float_t dePhi=TMath::Abs(clPar11[kClPh]-clPar1[kClPh]);
821 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
823 zproj1=meanRadiusLay1/TMath::Tan(clPar1[kClTh]);
824 zproj2=meanRadiusLay1/TMath::Tan(clPar11[kClTh]);
826 deZproj=TMath::Abs(zproj1-zproj2);
828 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
829 if (distClSameMod<=1.) fOverlapFlagClustersLay[0][iiC1]=kTRUE;
831 // if (distClSameMod<=1.) {
832 // if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
833 // distClSameModMin=distClSameMod;
839 } // end adjacent modules
841 } // end Loop on inner layer clusters
843 // if (distClSameModMin!=0.) fOverlapFlagClustersLay[0][iClOverlap]=kTRUE;
848 // Loop on outer layer clusters
849 for (Int_t iiC2=0; iiC2<fNClustersLay[1]; iiC2++) {
850 if (!fOverlapFlagClustersLay[1][iiC2]) {
851 // only for adjacent modules
852 Float_t *clPar2 = GetClusterLayer2(iiC2);
853 if ((TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==4) ||
854 (TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==156)) {
855 Float_t dePhi=TMath::Abs(clPar2[kClPh]-clPar2B[kClPh]);
856 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
858 zproj1=meanRadiusLay2/TMath::Tan(clPar2B[kClTh]);
859 zproj2=meanRadiusLay2/TMath::Tan(clPar2[kClTh]);
861 deZproj=TMath::Abs(zproj1-zproj2);
862 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
863 if (distClSameMod<=1.) fOverlapFlagClustersLay[1][iiC2]=kTRUE;
865 // if (distClSameMod<=1.) {
866 // if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
867 // distClSameModMin=distClSameMod;
872 } // end adjacent modules
874 } // end Loop on outer layer clusters
876 // if (distClSameModMin!=0.) fOverlapFlagClustersLay[1][iClOverlap]=kTRUE;
880 //____________________________________________________________________
881 void AliITSMultReconstructor::InitAux()
883 // init arrays/parameters for tracklet reconstruction
885 // dPhi shift is field dependent, get average magnetic field
888 if (TGeoGlobalMagField::Instance()) field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
890 AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor.");
892 else bz = TMath::Abs(field->SolenoidField());
893 fDPhiShift = fPhiShift / 5 * bz;
894 AliDebug(1, Form("Using phi shift of %f", fDPhiShift));
896 if (fPartners) delete[] fPartners; fPartners = new Int_t[fNClustersLay[1]];
897 if (fMinDists) delete[] fMinDists; fMinDists = new Float_t[fNClustersLay[1]];
898 if (fAssociatedLay1) delete[] fAssociatedLay1; fAssociatedLay1 = new Int_t[fNClustersLay[0]];
900 if (fBlackList) delete fBlackList; fBlackList = new AliRefArray(fNClustersLay[0]);
902 // Printf("Vertex in find tracklets...%f %f %f",vtx[0],vtx[1],vtx[2]);
903 for (Int_t i=0; i<fNClustersLay[1]; i++) {
905 fMinDists[i] = 2*fNStdDev;
907 memset(fAssociatedLay1,0,fNClustersLay[0]*sizeof(Int_t));
911 //____________________________________________________________________
912 void AliITSMultReconstructor::ClusterPos2Angles(const Float_t *vtx)
914 // convert cluster coordinates to angles wrt vertex
915 for (int ilr=0;ilr<2;ilr++) {
916 for (Int_t iC=0; iC<fNClustersLay[ilr]; iC++) {
917 float* clPar = GetClusterOfLayer(ilr,iC);
918 CalcThetaPhi(clPar[kClTh]-vtx[0],clPar[kClPh]-vtx[1],clPar[kClZ]-vtx[2],clPar[kClTh],clPar[kClPh]);
920 clPar[kClPh] = clPar[kClPh] + fPhiRotationAngle; // rotation of inner layer for comb studies
922 Float_t eta = clPar[kClTh];
923 eta= TMath::Tan(eta/2.);
924 eta=-TMath::Log(eta);
925 fhetaClustersLay1->Fill(eta);
926 fhphiClustersLay1->Fill(clPar[kClPh]);
934 //____________________________________________________________________
935 Int_t AliITSMultReconstructor::AssociateClusterOfL1(Int_t iC1)
937 // search association of cluster iC1 of L1 with all clusters of L2
938 if (fAssociatedLay1[iC1] != 0) return 0;
939 Int_t iC2WithBestDist = -1; // reset
940 Double_t minDist = 2*fNStdDev; // reset
941 float* clPar1 = GetClusterLayer1(iC1);
942 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) {
944 if (fBlackList->IsReferred(iC1,iC2)) continue;
945 float* clPar2 = GetClusterLayer2(iC2);
947 // find the difference in angles
948 Double_t dTheta = TMath::Abs(clPar2[kClTh] - clPar1[kClTh]);
949 Double_t dPhi = TMath::Abs(clPar2[kClPh] - clPar1[kClPh]);
950 // Printf("detheta %f dephi %f", dTheta,dPhi);
952 if (dPhi>TMath::Pi()) dPhi=2.*TMath::Pi()-dPhi; // take into account boundary condition
955 fhClustersDPhiAll->Fill(dPhi);
956 fhClustersDThetaAll->Fill(dTheta);
957 fhDPhiVsDThetaAll->Fill(dTheta, dPhi);
959 Float_t d = CalcDist(dPhi,dTheta,clPar1[kClTh]); // make "elliptical" cut in Phi and Theta!
960 // look for the minimum distance: the minimum is in iC2WithBestDist
961 if (d<fNStdDev && d<minDist) { minDist=d; iC2WithBestDist = iC2; }
964 if (minDist<fNStdDev) { // This means that a cluster in layer 2 was found that matches with iC1
966 if (fMinDists[iC2WithBestDist] > minDist) {
967 Int_t oldPartner = fPartners[iC2WithBestDist];
968 fPartners[iC2WithBestDist] = iC1;
969 fMinDists[iC2WithBestDist] = minDist;
971 fAssociatedLay1[iC1] = 1; // mark as assigned
973 if (oldPartner != -1) {
974 // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its fBlackList
975 fBlackList->AddReference(oldPartner,iC2WithBestDist);
976 fAssociatedLay1[oldPartner] = 0; // mark as free
979 // try again to find a cluster without considering iC2WithBestDist
980 fBlackList->AddReference(iC1,iC2WithBestDist);
984 else fAssociatedLay1[iC1] = 2;// cluster has no partner; remove
989 //____________________________________________________________________
990 Int_t AliITSMultReconstructor::StoreTrackletForL2Cluster(Int_t iC2)
992 // build tracklet for cluster iC2 of layer 2
993 if (fPartners[iC2] == -1) return 0;
994 if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (fPartners[iC2],iC2);
995 // Printf("saving tracklets");
996 if (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2]) return 0;
997 float* clPar2 = GetClusterLayer2(iC2);
998 float* clPar1 = GetClusterLayer1(fPartners[iC2]);
1000 Float_t* tracklet = fTracklets[fNTracklets] = new Float_t[kTrNPar]; // RS Add also the cluster id's
1002 tracklet[kTrTheta] = clPar1[kClTh]; // use the theta from the clusters in the first layer
1003 tracklet[kTrPhi] = clPar1[kClPh]; // use the phi from the clusters in the first layer
1004 tracklet[kTrDPhi] = clPar1[kClPh] - clPar2[kClPh]; // store the difference between phi1 and phi2
1006 // define dphi in the range [0,pi] with proper sign (track charge correlated)
1007 if (tracklet[kTrDPhi] > TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]-2.*TMath::Pi();
1008 if (tracklet[kTrDPhi] < -TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]+2.*TMath::Pi();
1010 tracklet[kTrDTheta] = clPar1[kClTh] - clPar2[kClTh]; // store the theta1-theta2
1013 fhClustersDPhiAcc->Fill(tracklet[kTrDPhi]);
1014 fhClustersDThetaAcc->Fill(tracklet[kTrDTheta]);
1015 fhDPhiVsDThetaAcc->Fill(tracklet[kTrDTheta],tracklet[kTrDPhi]);
1019 // if equal label in both clusters found this label is assigned
1020 // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned
1021 Int_t label1=0,label2=0;
1022 while (label2 < 3) {
1023 if ( int(clPar1[kClMC0+label1])!=-2 && int(clPar1[kClMC0+label1])==int(clPar2[kClMC0+label2])) break;
1024 if (++label1 == 3) { label1 = 0; label2++; }
1027 AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n",
1028 (Int_t) clPar1[kClMC0+label1], (Int_t) clPar1[kClMC0+label2], fNTracklets));
1029 tracklet[kTrLab1] = tracklet[kTrLab2] = clPar1[kClMC0+label1];
1031 AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n",
1032 (Int_t) clPar1[kClMC0], (Int_t) clPar1[kClMC1], (Int_t) clPar1[kClMC2],
1033 (Int_t) clPar2[kClMC0], (Int_t) clPar2[kClMC1], (Int_t) clPar2[kClMC2], fNTracklets));
1034 tracklet[kTrLab1] = clPar1[kClMC0];
1035 tracklet[kTrLab2] = clPar2[kClMC0];
1039 Float_t eta = tracklet[kTrTheta];
1040 eta= TMath::Tan(eta/2.);
1041 eta=-TMath::Log(eta);
1042 fhetaTracklets->Fill(eta);
1043 fhphiTracklets->Fill(tracklet[kTrPhi]);
1046 tracklet[kClID1] = fPartners[iC2];
1047 tracklet[kClID2] = iC2;
1049 // Printf("Adding tracklet candidate");
1050 AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
1051 AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", fPartners[iC2], iC2));
1053 fAssociatedLay1[fPartners[iC2]] = 1;
1058 //____________________________________________________________________
1059 void AliITSMultReconstructor::StoreL1Singles()
1061 // Printf("saving single clusters...");
1062 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) {
1063 float* clPar1 = GetClusterLayer1(iC1);
1064 if (fAssociatedLay1[iC1]==2||fAssociatedLay1[iC1]==0) {
1065 fSClusters[fNSingleCluster] = new Float_t[kClNPar];
1066 fSClusters[fNSingleCluster][kSCTh] = clPar1[kClTh];
1067 fSClusters[fNSingleCluster][kSCPh] = clPar1[kClPh];
1068 fSClusters[fNSingleCluster][kSCLab] = clPar1[kClMC0];
1069 fSClusters[fNSingleCluster][kSCID] = iC1;
1070 AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
1071 fNSingleCluster, iC1));
1078 //____________________________________________________________________
1079 void AliITSMultReconstructor::ProcessESDTracks()
1081 // Flag the clusters used by ESD tracks
1082 // Flag primary tracks to be used for multiplicity counting
1084 if (!fESDEvent || !fBuildRefs) return;
1085 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexTracks();
1086 if (!vtx || vtx->GetNContributors()<1) vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
1087 if (!vtx || vtx->GetNContributors()<1) {
1088 AliDebug(1,"No primary vertex: cannot flag primary tracks");
1091 Int_t ntracks = fESDEvent->GetNumberOfTracks();
1092 for(Int_t itr=0; itr<ntracks; itr++) {
1093 AliESDtrack* track = fESDEvent->GetTrack(itr);
1094 if (!track->IsOn(AliESDtrack::kITSin)) continue; // use only tracks propagated in ITS to vtx
1095 FlagTrackClusters(itr);
1096 FlagIfSecondary(track,vtx);
1102 //____________________________________________________________________
1103 void AliITSMultReconstructor::FlagTrackClusters(Int_t id)
1105 // RS: flag the SPD clusters of the track if it is useful for the multiplicity estimation
1107 const AliESDtrack* track = fESDEvent->GetTrack(id);
1109 if ( track->GetITSclusters(idx)<3 ) return; // at least 3 clusters must be used in the fit
1110 Int_t itsType = track->IsOn(AliESDtrack::kITSpureSA) ? 1:0;
1112 for (int i=6/*AliESDfriendTrack::kMaxITScluster*/;i--;) { // ignore extras: note: i>=6 is for extra clusters
1113 if (idx[i]<0) continue;
1114 int layID= (idx[i] & 0xf0000000) >> 28;
1115 if (layID>1) continue; // SPD only
1116 int clID = (idx[i] & 0x0fffffff);
1117 fUsedClusLay[layID][itsType]->AddReference(clID,id);
1118 fStoreRefs[layID][itsType] = kTRUE;
1123 //____________________________________________________________________
1124 void AliITSMultReconstructor::FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx)
1126 // RS: check if the track is primary and set the flag
1127 double cut = (track->HasPointOnITSLayer(0)||track->HasPointOnITSLayer(1)) ? fCutPxDrSPDin:fCutPxDrSPDout;
1129 track->GetDZ(vtx->GetX(),vtx->GetY(),vtx->GetZ(), fESDEvent->GetMagneticField(), xz);
1130 if (TMath::Abs(xz[0]*track->P())>cut || TMath::Abs(xz[1]*track->P())>fCutPxDz ||
1131 TMath::Abs(xz[0])>fCutDCArz || TMath::Abs(xz[1])>fCutDCArz)
1132 track->SetStatus(AliESDtrack::kMultSec);
1133 else track->ResetStatus(AliESDtrack::kMultSec);
1136 //____________________________________________________________________
1137 void AliITSMultReconstructor::FlagV0s(const AliESDVertex *vtx)
1139 // flag tracks belonging to v0s
1141 const double kK0Mass = 0.4976;
1144 AliKFVertex vertexKF;
1145 AliKFParticle epKF0,epKF1,pipmKF0,piKF0,piKF1,gammaKF,k0KF;
1146 Double_t mass,massErr,chi2c;
1147 enum {kKFIni=BIT(14)};
1151 vtx->GetXYZ(recVtx);
1152 for (int i=3;i--;) recVtxF[i] = recVtx[i];
1154 int ntracks = fESDEvent->GetNumberOfTracks();
1155 if (ntracks<2) return;
1157 vertexKF.X() = recVtx[0];
1158 vertexKF.Y() = recVtx[1];
1159 vertexKF.Z() = recVtx[2];
1160 vertexKF.Covariance(0,0) = vtx->GetXRes()*vtx->GetXRes();
1161 vertexKF.Covariance(1,2) = vtx->GetYRes()*vtx->GetYRes();
1162 vertexKF.Covariance(2,2) = vtx->GetZRes()*vtx->GetZRes();
1164 AliESDtrack *trc0,*trc1;
1165 for (int it0=0;it0<ntracks;it0++) {
1166 trc0 = fESDEvent->GetTrack(it0);
1167 if (trc0->IsOn(AliESDtrack::kMultInV0)) continue;
1168 if (!trc0->IsOn(AliESDtrack::kITSin)) continue;
1169 Bool_t isSAP = trc0->IsPureITSStandalone();
1170 Int_t q0 = trc0->Charge();
1171 Bool_t testGamma = CanBeElectron(trc0);
1172 epKF0.ResetBit(kKFIni);
1173 piKF0.ResetBit(kKFIni);
1174 double bestChi2=1e16;
1177 for (int it1=it0+1;it1<ntracks;it1++) {
1178 trc1 = fESDEvent->GetTrack(it1);
1179 if (trc1->IsOn(AliESDtrack::kMultInV0)) continue;
1180 if (!trc1->IsOn(AliESDtrack::kITSin)) continue;
1181 if (trc1->IsPureITSStandalone() != isSAP) continue; // pair separately ITS_SA_Pure tracks and TPC/ITS+ITS_SA
1182 if ( (q0+trc1->Charge())!=0 ) continue; // don't pair like signs
1184 pvertex.SetParamN(q0<0 ? *trc0:*trc1);
1185 pvertex.SetParamP(q0>0 ? *trc0:*trc1);
1186 pvertex.Update(recVtxF);
1187 if (pvertex.P()<fCutMinP) continue;
1188 if (pvertex.GetV0CosineOfPointingAngle()<fCutMinPointAngle) continue;
1189 if (pvertex.GetDcaV0Daughters()>fCutMaxDCADauther) continue;
1190 double d = pvertex.GetD(recVtx[0],recVtx[1],recVtx[2]);
1191 if (d>fCutMaxDCA) continue;
1192 double dx=recVtx[0]-pvertex.Xv(), dy=recVtx[1]-pvertex.Yv();
1193 double rv = TMath::Sqrt(dx*dx+dy*dy);
1195 // check gamma conversion hypothesis ----------------------------------------------------------->>>
1196 Bool_t gammaOK = kFALSE;
1197 while (testGamma && CanBeElectron(trc1)) {
1198 if (rv<fCutMinRGamma) break;
1199 if (!epKF0.TestBit(kKFIni)) {
1200 new(&epKF0) AliKFParticle(*trc0,q0>0 ? kPositron:kElectron);
1201 epKF0.SetBit(kKFIni);
1203 new(&epKF1) AliKFParticle(*trc1,q0<0 ? kPositron:kElectron);
1204 gammaKF.Initialize();
1207 gammaKF.SetProductionVertex(vertexKF);
1208 gammaKF.GetMass(mass,massErr);
1209 if (mass>fCutMassGamma || (massErr>0&&(mass>massErr*fCutMassGammaNSigma))) break;
1210 if (gammaKF.GetS()<fCutGammaSFromDecay) break;
1211 gammaKF.SetMassConstraint(0.,0.001);
1212 chi2c = (gammaKF.GetNDF()!=0) ? gammaKF.GetChi2()/gammaKF.GetNDF() : 1000;
1213 if (chi2c>fCutChi2cGamma) break;
1215 if (chi2c>bestChi2) break;
1220 if (gammaOK) continue;
1221 // check gamma conversion hypothesis -----------------------------------------------------------<<<
1222 // check K0 conversion hypothesis ----------------------------------------------------------->>>
1224 if (rv<fCutMinRK0) break;
1225 if (!piKF0.TestBit(kKFIni)) {
1226 new(&piKF0) AliKFParticle(*trc0,q0>0 ? kPiPlus:kPiMinus);
1227 piKF0.SetBit(kKFIni);
1229 new(&piKF1) AliKFParticle(*trc1,q0<0 ? kPiPlus:kPiMinus);
1233 k0KF.SetProductionVertex(vertexKF);
1234 k0KF.GetMass(mass,massErr);
1236 if (TMath::Abs(mass)>fCutMassK0 || (massErr>0&&(abs(mass)>massErr*fCutMassK0NSigma))) break;
1237 if (k0KF.GetS()<fCutK0SFromDecay) break;
1238 k0KF.SetMassConstraint(kK0Mass,0.001);
1239 chi2c = (k0KF.GetNDF()!=0) ? k0KF.GetChi2()/k0KF.GetNDF() : 1000;
1240 if (chi2c>fCutChi2cK0) break;
1241 if (chi2c>bestChi2) break;
1246 // check K0 conversion hypothesis -----------------------------------------------------------<<<
1250 trc0->SetStatus(AliESDtrack::kMultInV0);
1251 fESDEvent->GetTrack(bestID)->SetStatus(AliESDtrack::kMultInV0);
1257 //____________________________________________________________________
1258 Bool_t AliITSMultReconstructor::CanBeElectron(const AliESDtrack* trc) const
1260 // check if the track can be electron
1261 Double_t pid[AliPID::kSPECIES];
1262 if (!trc->IsOn(AliESDtrack::kESDpid)) return kTRUE;
1263 trc->GetESDpid(pid);
1264 return (trc->IsOn(AliESDtrack::kTPCpid)) ?
1265 pid[AliPID::kElectron]>fCutMinElectronProbTPC :
1266 pid[AliPID::kElectron]>fCutMinElectronProbESD;
1270 //____________________________________________________________________
1271 AliITSRecPoint* AliITSMultReconstructor::GetRecPoint(Int_t lr, Int_t n) const
1273 // return a cluster of lr corresponding to orderer cluster index n
1274 if (fClArr[lr] && fClusterCopyIndex[lr] && n<fNClustersLay[lr])
1275 return (AliITSRecPoint*) fClArr[lr]->At(fClusterCopyIndex[lr][n]);
1277 AliError("To access the clusters SetCreateClustersCopy should have been called");