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 fOverlapFlagClustersLay[i] = 0;
168 fNClustersLay[i] = 0;
171 // Method to reconstruct the charged particles multiplicity with the
176 if (AliITSReconstructor::GetRecoParam()) {
177 SetPhiWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiWindow());
178 SetThetaWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterThetaWindow());
179 SetPhiShift(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiShift());
180 SetRemoveClustersFromOverlaps(AliITSReconstructor::GetRecoParam()->GetTrackleterRemoveClustersFromOverlaps());
181 SetPhiOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiOverlapCut());
182 SetZetaOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterZetaOverlapCut());
183 SetPhiRotationAngle(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiRotationAngle());
184 SetNStdDev(AliITSReconstructor::GetRecoParam()->GetTrackleterNStdDevCut());
185 SetScaleDThetaBySin2T(AliITSReconstructor::GetRecoParam()->GetTrackleterScaleDThetaBySin2T());
186 SetBuildRefs(AliITSReconstructor::GetRecoParam()->GetTrackleterBuildCl2TrkRefs());
188 SetCutPxDrSPDin(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDin());
189 SetCutPxDrSPDout(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDout());
190 SetCutPxDz(AliITSReconstructor::GetRecoParam()->GetMultCutPxDz());
191 SetCutDCArz(AliITSReconstructor::GetRecoParam()->GetMultCutDCArz());
192 SetCutMinElectronProbTPC(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbTPC());
193 SetCutMinElectronProbESD(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbESD());
194 SetCutMinP(AliITSReconstructor::GetRecoParam()->GetMultCutMinP());
195 SetCutMinRGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMinRGamma());
196 SetCutMinRK0(AliITSReconstructor::GetRecoParam()->GetMultCutMinRK0());
197 SetCutMinPointAngle(AliITSReconstructor::GetRecoParam()->GetMultCutMinPointAngle());
198 SetCutMaxDCADauther(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCADauther());
199 SetCutMassGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGamma());
200 SetCutMassGammaNSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGammaNSigma());
201 SetCutMassK0(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0());
202 SetCutMassK0NSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0NSigma());
203 SetCutChi2cGamma(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cGamma());
204 SetCutChi2cK0(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cK0());
205 SetCutGammaSFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutGammaSFromDecay());
206 SetCutK0SFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutK0SFromDecay());
207 SetCutMaxDCA(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCA());
213 SetRemoveClustersFromOverlaps();
216 SetPhiRotationAngle();
223 SetCutMinElectronProbTPC();
224 SetCutMinElectronProbESD();
228 SetCutMinPointAngle();
229 SetCutMaxDCADauther();
231 SetCutMassGammaNSigma();
233 SetCutMassK0NSigma();
236 SetCutGammaSFromDecay();
237 SetCutK0SFromDecay();
244 // definition of histograms
245 Bool_t oldStatus = TH1::AddDirectoryStatus();
246 TH1::AddDirectory(kFALSE);
248 fhClustersDPhiAcc = new TH1F("dphiacc", "dphi", 100,-0.1,0.1);
249 fhClustersDThetaAcc = new TH1F("dthetaacc","dtheta",100,-0.1,0.1);
251 fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",100,-0.1,0.1,100,-0.1,0.1);
253 fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,0.0,0.5);
254 fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,0.0,0.5);
256 fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,0.,0.5,100,0.,0.5);
258 fhetaTracklets = new TH1F("etaTracklets", "eta", 100,-2.,2.);
259 fhphiTracklets = new TH1F("phiTracklets", "phi", 100, 0., 2*TMath::Pi());
260 fhetaClustersLay1 = new TH1F("etaClustersLay1", "etaCl1", 100,-2.,2.);
261 fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100, 0., 2*TMath::Pi());
262 for (int i=2;i--;) fStoreRefs[i][0] = fStoreRefs[i][1] = kFALSE;
263 TH1::AddDirectory(oldStatus);
266 //______________________________________________________________________
267 AliITSMultReconstructor::AliITSMultReconstructor(const AliITSMultReconstructor &mr) :
269 fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0),
277 fRemoveClustersFromOverlaps(0),
280 fPhiRotationAngle(0),
286 fCutPxDrSPDout(0.15),
289 fCutMinElectronProbTPC(0.5),
290 fCutMinElectronProbESD(0.1),
294 fCutMinPointAngle(0.98),
295 fCutMaxDCADauther(0.5),
297 fCutMassGammaNSigma(5.),
299 fCutMassK0NSigma(5.),
302 fCutGammaSFromDecay(-10.),
303 fCutK0SFromDecay(-10.),
307 fhClustersDPhiAcc(0),
308 fhClustersDThetaAcc(0),
309 fhClustersDPhiAll(0),
310 fhClustersDThetaAll(0),
311 fhDPhiVsDThetaAll(0),
312 fhDPhiVsDThetaAcc(0),
315 fhetaClustersLay1(0),
316 fhphiClustersLay1(0),
325 fCreateClustersCopy(0),
331 // Copy constructor :!!! RS ATTENTION: old c-tor reassigned the pointers instead of creating a new copy -> would crash on delete
332 AliError("May not use");
335 //______________________________________________________________________
336 AliITSMultReconstructor& AliITSMultReconstructor::operator=(const AliITSMultReconstructor& mr){
337 // Assignment operator
339 this->~AliITSMultReconstructor();
340 new(this) AliITSMultReconstructor(mr);
345 //______________________________________________________________________
346 AliITSMultReconstructor::~AliITSMultReconstructor(){
350 delete fhClustersDPhiAcc;
351 delete fhClustersDThetaAcc;
352 delete fhClustersDPhiAll;
353 delete fhClustersDThetaAll;
354 delete fhDPhiVsDThetaAll;
355 delete fhDPhiVsDThetaAcc;
356 delete fhetaTracklets;
357 delete fhphiTracklets;
358 delete fhetaClustersLay1;
359 delete fhphiClustersLay1;
362 for(Int_t i=0; i<fNTracklets; i++) delete [] fTracklets[i];
364 for(Int_t i=0; i<fNSingleCluster; i++) delete [] fSClusters[i];
367 for (int i=0;i<2;i++) {
368 delete[] fClustersLay[i];
369 delete[] fDetectorIndexClustersLay[i];
370 delete[] fOverlapFlagClustersLay[i];
372 for (int j=0;j<2;j++) delete fUsedClusLay[i][j];
374 delete [] fTracklets;
375 delete [] fSClusters;
377 delete[] fPartners; fPartners = 0;
378 delete[] fMinDists; fMinDists = 0;
379 delete fBlackList; fBlackList = 0;
383 //____________________________________________________________________
384 void AliITSMultReconstructor::Reconstruct(AliESDEvent* esd, TTree* treeRP)
386 if (!treeRP) { AliError(" Invalid ITS cluster tree !\n"); return; }
387 if (!esd) {AliError("ESDEvent is not available, use old reconstructor"); return;}
389 if (fMult) delete fMult; fMult = 0;
390 fNClustersLay[0] = 0;
391 fNClustersLay[1] = 0;
398 // >>>> RS: this part is equivalent to former AliITSVertexer::FindMultiplicity
400 // see if there is a SPD vertex
401 Bool_t isVtxOK=kTRUE, isCosmics=kFALSE;
402 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
403 if (!vtx || vtx->GetNContributors()<1) isVtxOK = kFALSE;
404 if (vtx && strstr(vtx->GetTitle(),"cosmics")) {
411 AliDebug(1,"Tracklets multiplicity not determined because the primary vertex was not found");
412 AliDebug(1,"Just counting the number of cluster-fired chips on the SPD layers");
417 float vtxf[3] = {vtx->GetX(),vtx->GetY(),vtx->GetZ()};
424 CreateMultiplicityObject();
427 //____________________________________________________________________
428 void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
430 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
432 if (fMult) delete fMult; fMult = 0;
433 fNClustersLay[0] = 0;
434 fNClustersLay[1] = 0;
438 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
441 SetTreeRP(clusterTree);
448 //____________________________________________________________________
449 void AliITSMultReconstructor::ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, const Float_t* vtx, Float_t*)
452 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
454 if (fMult) delete fMult; fMult = 0;
455 fNClustersLay[0] = 0;
456 fNClustersLay[1] = 0;
460 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
461 if (!clusterTreeMix) { AliError(" Invalid ITS cluster tree 2nd event !\n"); return; }
464 SetTreeRP(clusterTree);
465 SetTreeRPMix(clusterTreeMix);
472 //____________________________________________________________________
473 void AliITSMultReconstructor::FindTracklets(const Float_t *vtx)
475 // - calls LoadClusterArrays that finds the position of the clusters
478 // - convert the cluster coordinates to theta, phi (seen from the
479 // interaction vertex). Clusters in the inner layer can be now
480 // rotated for combinatorial studies
481 // - makes an array of tracklets
483 // After this method has been called, the clusters of the two layers
484 // and the tracklets can be retrieved by calling the Get'er methods.
487 // Find tracklets converging to vertex
489 LoadClusterArrays(fTreeRP,fTreeRPMix);
490 // flag clusters used by ESD tracks
491 if (fESDEvent) ProcessESDTracks();
498 // find the tracklets
499 AliDebug(1,"Looking for tracklets... ");
501 ClusterPos2Angles(vtx); // convert cluster position to angles wrt vtx
503 // Step1: find all tracklets allowing double assocation:
507 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) found += AssociateClusterOfL1(iC1);
510 // Step2: store tracklets; remove used clusters
511 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) StoreTrackletForL2Cluster(iC2);
513 // store unused single clusters of L1
516 AliDebug(1,Form("%d tracklets found", fNTracklets));
519 //____________________________________________________________________
520 void AliITSMultReconstructor::CreateMultiplicityObject()
522 // create AliMultiplicity object and store it in the ESD event
524 TBits fastOrFiredMap,firedChipMap;
526 fastOrFiredMap = fDetTypeRec->GetFastOrFiredMap();
527 firedChipMap = fDetTypeRec->GetFiredChipMap(fTreeRP);
530 fMult = new AliMultiplicity(fNTracklets,fNSingleCluster,fNFiredChips[0],fNFiredChips[1],fastOrFiredMap);
531 fMult->SetMultTrackRefs( fBuildRefs );
532 // store some details of reco:
533 fMult->SetScaleDThetaBySin2T(fScaleDTBySin2T);
534 fMult->SetDPhiWindow2(fDPhiWindow2);
535 fMult->SetDThetaWindow2(fDThetaWindow2);
536 fMult->SetDPhiShift(fDPhiShift);
537 fMult->SetNStdDev(fNStdDev);
539 fMult->SetFiredChipMap(firedChipMap);
540 AliITSRecPointContainer* rcont = AliITSRecPointContainer::Instance();
541 fMult->SetITSClusters(0,rcont->GetNClustersInLayer(1,fTreeRP));
542 for(Int_t kk=2;kk<=6;kk++) fMult->SetITSClusters(kk-1,rcont->GetNClustersInLayerFast(kk));
545 AliRefArray *refs[2][2] = {{0,0},{0,0}};
548 for (int it=2;it--;) // tracklet_clusters->track references to stor
549 if (fStoreRefs[il][it]) refs[il][it] = new AliRefArray(fNTracklets,0);
552 for (int i=fNTracklets;i--;) {
553 float* tlInfo = fTracklets[i];
554 fMult->SetTrackletData(i,tlInfo);
556 if (!fBuildRefs) continue; // do we need references?
557 for (int itp=0;itp<2;itp++) {
558 for (int ilr=0;ilr<2;ilr++) {
559 if (!fStoreRefs[ilr][itp]) continue; // nothing to store
560 int clID = int(tlInfo[ilr ? kClID2:kClID1]);
561 int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100);
563 else if (nref==1) refs[ilr][itp]->AddReference(i,shared[0]);
564 else refs[ilr][itp]->AddReferences(i,shared,nref);
568 if (fBuildRefs) fMult->AttachTracklet2TrackRefs(refs[0][0],refs[0][1],refs[1][0],refs[1][1]);
570 AliRefArray *refsc[2] = {0,0};
571 if (fBuildRefs) for (int it=2;it--;) if (fStoreRefs[0][it]) refsc[it] = new AliRefArray(fNClustersLay[0]);
572 for (int i=fNSingleCluster;i--;) {
573 float* clInfo = fSClusters[i];
574 fMult->SetSingleClusterData(i,clInfo);
576 if (!fBuildRefs) continue; // do we need references?
577 int clID = int(clInfo[kSCID]);
578 for (int itp=0;itp<2;itp++) {
579 if (!fStoreRefs[0][itp]) continue;
580 int nref = fUsedClusLay[0][itp]->GetReferences(clID,shared,100);
582 else if (nref==1) refsc[itp]->AddReference(i,shared[0]);
583 else refsc[itp]->AddReferences(i,shared,nref);
586 if (fBuildRefs) fMult->AttachCluster2TrackRefs(refsc[0],refsc[1]);
587 fMult->CompactBits();
592 //____________________________________________________________________
593 void AliITSMultReconstructor::LoadClusterArrays(TTree* tree, TTree* treeMix)
595 // load cluster info and prepare tracklets arrays
597 if (AreClustersLoaded()) {AliInfo("Clusters are already loaded"); return;}
598 LoadClusterArrays(tree,0);
599 LoadClusterArrays(treeMix ? treeMix:tree,1);
600 int nmaxT = TMath::Min(fNClustersLay[0], fNClustersLay[1]);
601 if (fTracklets) delete[] fTracklets;
602 fTracklets = new Float_t*[nmaxT];
603 memset(fTracklets,0,nmaxT*sizeof(Float_t*));
605 if (fSClusters) delete[] fSClusters;
606 fSClusters = new Float_t*[fNClustersLay[0]];
607 memset(fSClusters,0,fNClustersLay[0]*sizeof(Float_t*));
609 AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay[0],fNClustersLay[1]));
610 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
614 //____________________________________________________________________
615 void AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree, int il)
618 // - gets the clusters from the cluster tree for layer il
619 // - convert them into global coordinates
620 // - store them in the internal arrays
621 // - count the number of cluster-fired chips
623 // RS: This method was strongly modified wrt original. In order to have the same numbering
624 // of clusters as in the ITS reco I had to introduce sorting in Z
625 // Also note that now the clusters data are stored not in float[6] attached to float**, but in 1-D array
626 AliDebug(1,Form("Loading clusters and cluster-fired chips for layer %d",il));
628 fNClustersLay[il] = 0;
629 fNFiredChips[il] = 0;
630 for (int i=2;i--;) fStoreRefs[il][i] = kFALSE;
632 AliITSRecPointContainer* rpcont = 0;
633 static TClonesArray statITSrec("AliITSRecPoint");
634 static TObjArray clArr(100);
636 TClonesArray* itsClusters = 0;
638 if (!fCreateClustersCopy) {
639 rpcont=AliITSRecPointContainer::Instance();
640 itsClusters = rpcont->FetchClusters(0,itsClusterTree);
641 if(!rpcont->IsSPDActive()){
642 AliWarning("No SPD rec points found, multiplicity not calculated");
647 itsClusters = &statITSrec;
648 branch = itsClusterTree->GetBranch("ITSRecPoints");
649 branch->SetAddress(&itsClusters);
650 if (!fClArr[il]) fClArr[il] = new TClonesArray("AliITSRecPoint",100);
654 // loop over the SPD subdetectors
656 int detMin = TMath::Max(0,AliITSgeomTGeo::GetModuleIndex(il+1,1,1));
657 int detMax = AliITSgeomTGeo::GetModuleIndex(il+2,1,1);
658 for (int idt=detMin;idt<detMax;idt++) {
659 if (!fCreateClustersCopy) itsClusters = rpcont->UncheckedGetClusters(idt);
660 else branch->GetEvent(idt);
661 int nClusters = itsClusters->GetEntriesFast();
662 if (!nClusters) continue;
663 Int_t nClustersInChip[5] = {0,0,0,0,0};
665 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
666 if (!cluster) continue;
667 if (fCreateClustersCopy) cluster = new ((*fClArr[il])[nclLayer]) AliITSRecPoint(*cluster);
668 clArr.AddAtAndExpand(cluster,nclLayer++);
669 Int_t chipNo = fSPDSeg.GetChipFromLocal(0,cluster->GetDetLocalZ());
670 if(chipNo>=0)nClustersInChip[ chipNo ]++;
672 for(Int_t ifChip=5;ifChip--;) if (nClustersInChip[ifChip]) fNFiredChips[il]++;
674 // sort the clusters in Z (to have the same numbering as in ITS reco
675 Float_t *z = new Float_t[nclLayer];
676 Int_t *index = new Int_t[nclLayer];
677 for (int ic=0;ic<nclLayer;ic++) z[ic] = ((AliITSRecPoint*)clArr[ic])->GetZ();
678 TMath::Sort(nclLayer,z,index,kFALSE);
679 Float_t* clustersLay = new Float_t[nclLayer*kClNPar];
680 Int_t* detectorIndexClustersLay = new Int_t[nclLayer];
681 Bool_t* overlapFlagClustersLay = new Bool_t[nclLayer];
683 for (int ic=0;ic<nclLayer;ic++) {
684 AliITSRecPoint* cluster = (AliITSRecPoint*)clArr[index[ic]];
685 float* clPar = &clustersLay[ic*kClNPar];
687 cluster->GetGlobalXYZ( clPar );
688 detectorIndexClustersLay[ic] = cluster->GetDetectorIndex();
689 overlapFlagClustersLay[ic] = kFALSE;
690 for (Int_t i=3;i--;) clPar[kClMC0+i] = cluster->GetLabel(i);
696 if (fOverlapFlagClustersLay[il]) delete[] fOverlapFlagClustersLay[il];
697 fOverlapFlagClustersLay[il] = overlapFlagClustersLay;
699 if (fDetectorIndexClustersLay[il]) delete[] fDetectorIndexClustersLay[il];
700 fDetectorIndexClustersLay[il] = detectorIndexClustersLay;
703 for (int it=0;it<2;it++) {
704 if (fUsedClusLay[il][it]) delete fUsedClusLay[il][it];
705 fUsedClusLay[il][it] = new AliRefArray(nclLayer);
709 if (fClustersLay[il]) delete[] fClustersLay[il];
710 fClustersLay[il] = clustersLay;
711 fNClustersLay[il] = nclLayer;
715 //____________________________________________________________________
716 void AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) {
718 // - gets the clusters from the cluster tree
719 // - counts the number of (cluster)fired chips
721 AliDebug(1,"Loading cluster-fired chips ...");
726 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
727 TClonesArray* itsClusters=NULL;
728 rpcont->FetchClusters(0,itsClusterTree);
729 if(!rpcont->IsSPDActive()){
730 AliWarning("No SPD rec points found, multiplicity not calculated");
734 // loop over the its subdetectors
735 Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1);
736 for (Int_t iIts=0; iIts < nSPDmodules; iIts++) {
737 itsClusters=rpcont->UncheckedGetClusters(iIts);
738 Int_t nClusters = itsClusters->GetEntriesFast();
740 // number of clusters in each chip of the current module
741 Int_t nClustersInChip[5] = {0,0,0,0,0};
745 AliITSgeomTGeo::GetModuleId(iIts,layer,ladder,det);
746 --layer; // layer is from 1 to 6 in AliITSgeomTGeo, but from 0 to 5 here
747 if(layer<0 || layer >1)continue;
749 // loop over clusters
751 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
753 // find the chip for the current cluster
754 Float_t locz = cluster->GetDetLocalZ();
755 Int_t iChip = fSPDSeg.GetChipFromLocal(0,locz);
756 if (iChip>=0) nClustersInChip[iChip]++;
758 }// end of cluster loop
760 // get number of fired chips in the current module
761 for(Int_t ifChip=0; ifChip<5; ifChip++) {
762 if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
765 } // end of its "subdetector" loop
768 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
770 //____________________________________________________________________
772 AliITSMultReconstructor::SaveHists() {
773 // This method save the histograms on the output file
774 // (only if fHistOn is TRUE).
779 fhClustersDPhiAll->Write();
780 fhClustersDThetaAll->Write();
781 fhDPhiVsDThetaAll->Write();
783 fhClustersDPhiAcc->Write();
784 fhClustersDThetaAcc->Write();
785 fhDPhiVsDThetaAcc->Write();
787 fhetaTracklets->Write();
788 fhphiTracklets->Write();
789 fhetaClustersLay1->Write();
790 fhphiClustersLay1->Write();
793 //____________________________________________________________________
794 void AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist)
796 // Flags clusters in the overlapping regions
797 Float_t distClSameMod=0.;
798 Float_t distClSameModMin=0.;
800 Float_t meanRadiusLay1 = 3.99335; // average radius inner layer
801 Float_t meanRadiusLay2 = 7.37935; // average radius outer layer;
806 Float_t* clPar1 = GetClusterLayer1(iC1);
807 Float_t* clPar2B = GetClusterLayer2(iC2WithBestDist);
808 // Loop on inner layer clusters
809 for (Int_t iiC1=0; iiC1<fNClustersLay[0]; iiC1++) {
810 if (!fOverlapFlagClustersLay[0][iiC1]) {
811 // only for adjacent modules
812 if ((TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==4)||
813 (TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==76)) {
814 Float_t *clPar11 = GetClusterLayer1(iiC1);
815 Float_t dePhi=TMath::Abs(clPar11[kClPh]-clPar1[kClPh]);
816 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
818 zproj1=meanRadiusLay1/TMath::Tan(clPar1[kClTh]);
819 zproj2=meanRadiusLay1/TMath::Tan(clPar11[kClTh]);
821 deZproj=TMath::Abs(zproj1-zproj2);
823 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
824 if (distClSameMod<=1.) fOverlapFlagClustersLay[0][iiC1]=kTRUE;
826 // if (distClSameMod<=1.) {
827 // if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
828 // distClSameModMin=distClSameMod;
834 } // end adjacent modules
836 } // end Loop on inner layer clusters
838 // if (distClSameModMin!=0.) fOverlapFlagClustersLay[0][iClOverlap]=kTRUE;
843 // Loop on outer layer clusters
844 for (Int_t iiC2=0; iiC2<fNClustersLay[1]; iiC2++) {
845 if (!fOverlapFlagClustersLay[1][iiC2]) {
846 // only for adjacent modules
847 Float_t *clPar2 = GetClusterLayer2(iiC2);
848 if ((TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==4) ||
849 (TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==156)) {
850 Float_t dePhi=TMath::Abs(clPar2[kClPh]-clPar2B[kClPh]);
851 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
853 zproj1=meanRadiusLay2/TMath::Tan(clPar2B[kClTh]);
854 zproj2=meanRadiusLay2/TMath::Tan(clPar2[kClTh]);
856 deZproj=TMath::Abs(zproj1-zproj2);
857 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
858 if (distClSameMod<=1.) fOverlapFlagClustersLay[1][iiC2]=kTRUE;
860 // if (distClSameMod<=1.) {
861 // if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
862 // distClSameModMin=distClSameMod;
867 } // end adjacent modules
869 } // end Loop on outer layer clusters
871 // if (distClSameModMin!=0.) fOverlapFlagClustersLay[1][iClOverlap]=kTRUE;
875 //____________________________________________________________________
876 void AliITSMultReconstructor::InitAux()
878 // init arrays/parameters for tracklet reconstruction
880 // dPhi shift is field dependent, get average magnetic field
883 if (TGeoGlobalMagField::Instance()) field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
885 AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor.");
887 else bz = TMath::Abs(field->SolenoidField());
888 fDPhiShift = fPhiShift / 5 * bz;
889 AliDebug(1, Form("Using phi shift of %f", fDPhiShift));
891 if (fPartners) delete[] fPartners; fPartners = new Int_t[fNClustersLay[1]];
892 if (fMinDists) delete[] fMinDists; fMinDists = new Float_t[fNClustersLay[1]];
893 if (fAssociatedLay1) delete[] fAssociatedLay1; fAssociatedLay1 = new Int_t[fNClustersLay[0]];
895 if (fBlackList) delete fBlackList; fBlackList = new AliRefArray(fNClustersLay[0]);
897 // Printf("Vertex in find tracklets...%f %f %f",vtx[0],vtx[1],vtx[2]);
898 for (Int_t i=0; i<fNClustersLay[1]; i++) {
900 fMinDists[i] = 2*fNStdDev;
902 memset(fAssociatedLay1,0,fNClustersLay[0]*sizeof(Int_t));
906 //____________________________________________________________________
907 void AliITSMultReconstructor::ClusterPos2Angles(const Float_t *vtx)
909 // convert cluster coordinates to angles wrt vertex
910 for (int ilr=0;ilr<2;ilr++) {
911 for (Int_t iC=0; iC<fNClustersLay[ilr]; iC++) {
912 float* clPar = GetClusterOfLayer(ilr,iC);
913 CalcThetaPhi(clPar[kClTh]-vtx[0],clPar[kClPh]-vtx[1],clPar[kClZ]-vtx[2],clPar[kClTh],clPar[kClPh]);
915 clPar[kClPh] = clPar[kClPh] + fPhiRotationAngle; // rotation of inner layer for comb studies
917 Float_t eta = clPar[kClTh];
918 eta= TMath::Tan(eta/2.);
919 eta=-TMath::Log(eta);
920 fhetaClustersLay1->Fill(eta);
921 fhphiClustersLay1->Fill(clPar[kClPh]);
929 //____________________________________________________________________
930 Int_t AliITSMultReconstructor::AssociateClusterOfL1(Int_t iC1)
932 // search association of cluster iC1 of L1 with all clusters of L2
933 if (fAssociatedLay1[iC1] != 0) return 0;
934 Int_t iC2WithBestDist = -1; // reset
935 Double_t minDist = 2*fNStdDev; // reset
936 float* clPar1 = GetClusterLayer1(iC1);
937 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) {
939 if (fBlackList->IsReferred(iC1,iC2)) continue;
940 float* clPar2 = GetClusterLayer2(iC2);
942 // find the difference in angles
943 Double_t dTheta = TMath::Abs(clPar2[kClTh] - clPar1[kClTh]);
944 Double_t dPhi = TMath::Abs(clPar2[kClPh] - clPar1[kClPh]);
945 // Printf("detheta %f dephi %f", dTheta,dPhi);
947 if (dPhi>TMath::Pi()) dPhi=2.*TMath::Pi()-dPhi; // take into account boundary condition
950 fhClustersDPhiAll->Fill(dPhi);
951 fhClustersDThetaAll->Fill(dTheta);
952 fhDPhiVsDThetaAll->Fill(dTheta, dPhi);
954 Float_t d = CalcDist(dPhi,dTheta,clPar1[kClTh]); // make "elliptical" cut in Phi and Theta!
955 // look for the minimum distance: the minimum is in iC2WithBestDist
956 if (d<fNStdDev && d<minDist) { minDist=d; iC2WithBestDist = iC2; }
959 if (minDist<fNStdDev) { // This means that a cluster in layer 2 was found that matches with iC1
961 if (fMinDists[iC2WithBestDist] > minDist) {
962 Int_t oldPartner = fPartners[iC2WithBestDist];
963 fPartners[iC2WithBestDist] = iC1;
964 fMinDists[iC2WithBestDist] = minDist;
966 fAssociatedLay1[iC1] = 1; // mark as assigned
968 if (oldPartner != -1) {
969 // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its fBlackList
970 fBlackList->AddReference(oldPartner,iC2WithBestDist);
971 fAssociatedLay1[oldPartner] = 0; // mark as free
974 // try again to find a cluster without considering iC2WithBestDist
975 fBlackList->AddReference(iC1,iC2WithBestDist);
979 else fAssociatedLay1[iC1] = 2;// cluster has no partner; remove
984 //____________________________________________________________________
985 Int_t AliITSMultReconstructor::StoreTrackletForL2Cluster(Int_t iC2)
987 // build tracklet for cluster iC2 of layer 2
988 if (fPartners[iC2] == -1) return 0;
989 if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (fPartners[iC2],iC2);
990 // Printf("saving tracklets");
991 if (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2]) return 0;
992 float* clPar2 = GetClusterLayer2(iC2);
993 float* clPar1 = GetClusterLayer1(fPartners[iC2]);
995 Float_t* tracklet = fTracklets[fNTracklets] = new Float_t[kTrNPar]; // RS Add also the cluster id's
997 tracklet[kTrTheta] = clPar1[kClTh]; // use the theta from the clusters in the first layer
998 tracklet[kTrPhi] = clPar1[kClPh]; // use the phi from the clusters in the first layer
999 tracklet[kTrDPhi] = clPar1[kClPh] - clPar2[kClPh]; // store the difference between phi1 and phi2
1001 // define dphi in the range [0,pi] with proper sign (track charge correlated)
1002 if (tracklet[kTrDPhi] > TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]-2.*TMath::Pi();
1003 if (tracklet[kTrDPhi] < -TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]+2.*TMath::Pi();
1005 tracklet[kTrDTheta] = clPar1[kClTh] - clPar2[kClTh]; // store the theta1-theta2
1008 fhClustersDPhiAcc->Fill(tracklet[kTrDPhi]);
1009 fhClustersDThetaAcc->Fill(tracklet[kTrDTheta]);
1010 fhDPhiVsDThetaAcc->Fill(tracklet[kTrDTheta],tracklet[kTrDPhi]);
1014 // if equal label in both clusters found this label is assigned
1015 // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned
1016 Int_t label1=0,label2=0;
1017 while (label2 < 3) {
1018 if ( int(clPar1[kClMC0+label1])!=-2 && int(clPar1[kClMC0+label1])==int(clPar2[kClMC0+label2])) break;
1019 if (++label1 == 3) { label1 = 0; label2++; }
1022 AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n",
1023 (Int_t) clPar1[kClMC0+label1], (Int_t) clPar1[kClMC0+label2], fNTracklets));
1024 tracklet[kTrLab1] = tracklet[kTrLab2] = clPar1[kClMC0+label1];
1026 AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n",
1027 (Int_t) clPar1[kClMC0], (Int_t) clPar1[kClMC1], (Int_t) clPar1[kClMC2],
1028 (Int_t) clPar2[kClMC0], (Int_t) clPar2[kClMC1], (Int_t) clPar2[kClMC2], fNTracklets));
1029 tracklet[kTrLab1] = clPar1[kClMC0];
1030 tracklet[kTrLab2] = clPar2[kClMC0];
1034 Float_t eta = tracklet[kTrTheta];
1035 eta= TMath::Tan(eta/2.);
1036 eta=-TMath::Log(eta);
1037 fhetaTracklets->Fill(eta);
1038 fhphiTracklets->Fill(tracklet[kTrPhi]);
1041 tracklet[kClID1] = fPartners[iC2];
1042 tracklet[kClID2] = iC2;
1044 // Printf("Adding tracklet candidate");
1045 AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
1046 AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", fPartners[iC2], iC2));
1048 fAssociatedLay1[fPartners[iC2]] = 1;
1053 //____________________________________________________________________
1054 void AliITSMultReconstructor::StoreL1Singles()
1056 // Printf("saving single clusters...");
1057 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) {
1058 float* clPar1 = GetClusterLayer1(iC1);
1059 if (fAssociatedLay1[iC1]==2||fAssociatedLay1[iC1]==0) {
1060 fSClusters[fNSingleCluster] = new Float_t[kClNPar];
1061 fSClusters[fNSingleCluster][kSCTh] = clPar1[kClTh];
1062 fSClusters[fNSingleCluster][kSCPh] = clPar1[kClPh];
1063 fSClusters[fNSingleCluster][kSCLab] = clPar1[kClMC0];
1064 fSClusters[fNSingleCluster][kSCID] = iC1;
1065 AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
1066 fNSingleCluster, iC1));
1073 //____________________________________________________________________
1074 void AliITSMultReconstructor::ProcessESDTracks()
1076 // Flag the clusters used by ESD tracks
1077 // Flag primary tracks to be used for multiplicity counting
1079 if (!fESDEvent || !fBuildRefs) return;
1080 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexTracks();
1081 if (!vtx || vtx->GetNContributors()<1) vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
1082 if (!vtx || vtx->GetNContributors()<1) {
1083 AliDebug(1,"No primary vertex: cannot flag primary tracks");
1086 Int_t ntracks = fESDEvent->GetNumberOfTracks();
1087 for(Int_t itr=0; itr<ntracks; itr++) {
1088 AliESDtrack* track = fESDEvent->GetTrack(itr);
1089 if (!track->IsOn(AliESDtrack::kITSin)) continue; // use only tracks propagated in ITS to vtx
1090 FlagTrackClusters(itr);
1091 FlagIfSecondary(track,vtx);
1097 //____________________________________________________________________
1098 void AliITSMultReconstructor::FlagTrackClusters(Int_t id)
1100 // RS: flag the SPD clusters of the track if it is useful for the multiplicity estimation
1102 const AliESDtrack* track = fESDEvent->GetTrack(id);
1104 if ( track->GetITSclusters(idx)<3 ) return; // at least 3 clusters must be used in the fit
1105 Int_t itsType = track->IsOn(AliESDtrack::kITSpureSA) ? 1:0;
1107 for (int i=6/*AliESDfriendTrack::kMaxITScluster*/;i--;) { // ignore extras: note: i>=6 is for extra clusters
1108 if (idx[i]<0) continue;
1109 int layID= (idx[i] & 0xf0000000) >> 28;
1110 if (layID>1) continue; // SPD only
1111 int clID = (idx[i] & 0x0fffffff);
1112 fUsedClusLay[layID][itsType]->AddReference(clID,id);
1113 fStoreRefs[layID][itsType] = kTRUE;
1118 //____________________________________________________________________
1119 void AliITSMultReconstructor::FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx)
1121 // RS: check if the track is primary and set the flag
1122 double cut = (track->HasPointOnITSLayer(0)||track->HasPointOnITSLayer(1)) ? fCutPxDrSPDin:fCutPxDrSPDout;
1124 track->GetDZ(vtx->GetX(),vtx->GetY(),vtx->GetZ(), fESDEvent->GetMagneticField(), xz);
1125 if (TMath::Abs(xz[0]*track->P())>cut || TMath::Abs(xz[1]*track->P())>fCutPxDz ||
1126 TMath::Abs(xz[0])>fCutDCArz || TMath::Abs(xz[1])>fCutDCArz)
1127 track->SetStatus(AliESDtrack::kMultSec);
1128 else track->ResetStatus(AliESDtrack::kMultSec);
1131 //____________________________________________________________________
1132 void AliITSMultReconstructor::FlagV0s(const AliESDVertex *vtx)
1134 // flag tracks belonging to v0s
1136 const double kK0Mass = 0.4976;
1139 AliKFVertex vertexKF;
1140 AliKFParticle epKF0,epKF1,pipmKF0,piKF0,piKF1,gammaKF,k0KF;
1141 Double_t mass,massErr,chi2c;
1142 enum {kKFIni=BIT(14)};
1146 vtx->GetXYZ(recVtx);
1147 for (int i=3;i--;) recVtxF[i] = recVtx[i];
1149 int ntracks = fESDEvent->GetNumberOfTracks();
1150 if (ntracks<2) return;
1152 vertexKF.X() = recVtx[0];
1153 vertexKF.Y() = recVtx[1];
1154 vertexKF.Z() = recVtx[2];
1155 vertexKF.Covariance(0,0) = vtx->GetXRes()*vtx->GetXRes();
1156 vertexKF.Covariance(1,2) = vtx->GetYRes()*vtx->GetYRes();
1157 vertexKF.Covariance(2,2) = vtx->GetZRes()*vtx->GetZRes();
1159 AliESDtrack *trc0,*trc1;
1160 for (int it0=0;it0<ntracks;it0++) {
1161 trc0 = fESDEvent->GetTrack(it0);
1162 if (trc0->IsOn(AliESDtrack::kMultInV0)) continue;
1163 if (!trc0->IsOn(AliESDtrack::kITSin)) continue;
1164 Bool_t isSAP = trc0->IsPureITSStandalone();
1165 Int_t q0 = trc0->Charge();
1166 Bool_t testGamma = CanBeElectron(trc0);
1167 epKF0.ResetBit(kKFIni);
1168 piKF0.ResetBit(kKFIni);
1169 double bestChi2=1e16;
1172 for (int it1=it0+1;it1<ntracks;it1++) {
1173 trc1 = fESDEvent->GetTrack(it1);
1174 if (trc1->IsOn(AliESDtrack::kMultInV0)) continue;
1175 if (!trc1->IsOn(AliESDtrack::kITSin)) continue;
1176 if (trc1->IsPureITSStandalone() != isSAP) continue; // pair separately ITS_SA_Pure tracks and TPC/ITS+ITS_SA
1177 if ( (q0+trc1->Charge())!=0 ) continue; // don't pair like signs
1179 pvertex.SetParamN(q0<0 ? *trc0:*trc1);
1180 pvertex.SetParamP(q0>0 ? *trc0:*trc1);
1181 pvertex.Update(recVtxF);
1182 if (pvertex.P()<fCutMinP) continue;
1183 if (pvertex.GetV0CosineOfPointingAngle()<fCutMinPointAngle) continue;
1184 if (pvertex.GetDcaV0Daughters()>fCutMaxDCADauther) continue;
1185 double d = pvertex.GetD(recVtx[0],recVtx[1],recVtx[2]);
1186 if (d>fCutMaxDCA) continue;
1187 double dx=recVtx[0]-pvertex.Xv(), dy=recVtx[1]-pvertex.Yv();
1188 double rv = TMath::Sqrt(dx*dx+dy*dy);
1190 // check gamma conversion hypothesis ----------------------------------------------------------->>>
1191 Bool_t gammaOK = kFALSE;
1192 while (testGamma && CanBeElectron(trc1)) {
1193 if (rv<fCutMinRGamma) break;
1194 if (!epKF0.TestBit(kKFIni)) {
1195 new(&epKF0) AliKFParticle(*trc0,q0>0 ? kPositron:kElectron);
1196 epKF0.SetBit(kKFIni);
1198 new(&epKF1) AliKFParticle(*trc1,q0<0 ? kPositron:kElectron);
1199 gammaKF.Initialize();
1202 gammaKF.SetProductionVertex(vertexKF);
1203 gammaKF.GetMass(mass,massErr);
1204 if (mass>fCutMassGamma || (massErr>0&&(mass>massErr*fCutMassGammaNSigma))) break;
1205 if (gammaKF.GetS()<fCutGammaSFromDecay) break;
1206 gammaKF.SetMassConstraint(0.,0.001);
1207 chi2c = (gammaKF.GetNDF()!=0) ? gammaKF.GetChi2()/gammaKF.GetNDF() : 1000;
1208 if (chi2c>fCutChi2cGamma) break;
1210 if (chi2c>bestChi2) break;
1215 if (gammaOK) continue;
1216 // check gamma conversion hypothesis -----------------------------------------------------------<<<
1217 // check K0 conversion hypothesis ----------------------------------------------------------->>>
1219 if (rv<fCutMinRK0) break;
1220 if (!piKF0.TestBit(kKFIni)) {
1221 new(&piKF0) AliKFParticle(*trc0,q0>0 ? kPiPlus:kPiMinus);
1222 piKF0.SetBit(kKFIni);
1224 new(&piKF1) AliKFParticle(*trc1,q0<0 ? kPiPlus:kPiMinus);
1228 k0KF.SetProductionVertex(vertexKF);
1229 k0KF.GetMass(mass,massErr);
1231 if (TMath::Abs(mass)>fCutMassK0 || (massErr>0&&(abs(mass)>massErr*fCutMassK0NSigma))) break;
1232 if (k0KF.GetS()<fCutK0SFromDecay) break;
1233 k0KF.SetMassConstraint(kK0Mass,0.001);
1234 chi2c = (k0KF.GetNDF()!=0) ? k0KF.GetChi2()/k0KF.GetNDF() : 1000;
1235 if (chi2c>fCutChi2cK0) break;
1236 if (chi2c>bestChi2) break;
1241 // check K0 conversion hypothesis -----------------------------------------------------------<<<
1245 trc0->SetStatus(AliESDtrack::kMultInV0);
1246 fESDEvent->GetTrack(bestID)->SetStatus(AliESDtrack::kMultInV0);
1252 //____________________________________________________________________
1253 Bool_t AliITSMultReconstructor::CanBeElectron(const AliESDtrack* trc) const
1255 // check if the track can be electron
1256 Double_t pid[AliPID::kSPECIES];
1257 if (!trc->IsOn(AliESDtrack::kESDpid)) return kTRUE;
1258 trc->GetESDpid(pid);
1259 return (trc->IsOn(AliESDtrack::kTPCpid)) ?
1260 pid[AliPID::kElectron]>fCutMinElectronProbTPC :
1261 pid[AliPID::kElectron]>fCutMinElectronProbESD;