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),
160 for (int i=0;i<2;i++) {
163 for (int j=0;j<2;j++) fUsedClusLay[i][j] = 0;
164 fDetectorIndexClustersLay[i] = 0;
165 fOverlapFlagClustersLay[i] = 0;
166 fNClustersLay[i] = 0;
169 // Method to reconstruct the charged particles multiplicity with the
174 if(AliITSReconstructor::GetRecoParam()) {
175 SetPhiWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiWindow());
176 SetThetaWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterThetaWindow());
177 SetPhiShift(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiShift());
178 SetRemoveClustersFromOverlaps(AliITSReconstructor::GetRecoParam()->GetTrackleterRemoveClustersFromOverlaps());
179 SetPhiOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiOverlapCut());
180 SetZetaOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterZetaOverlapCut());
181 SetPhiRotationAngle(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiRotationAngle());
182 SetNStdDev(AliITSReconstructor::GetRecoParam()->GetTrackleterNStdDevCut());
183 SetScaleDThetaBySin2T(AliITSReconstructor::GetRecoParam()->GetTrackleterScaleDThetaBySin2T());
185 SetCutPxDrSPDin(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDin());
186 SetCutPxDrSPDout(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDout());
187 SetCutPxDz(AliITSReconstructor::GetRecoParam()->GetMultCutPxDz());
188 SetCutDCArz(AliITSReconstructor::GetRecoParam()->GetMultCutDCArz());
189 SetCutMinElectronProbTPC(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbTPC());
190 SetCutMinElectronProbESD(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbESD());
191 SetCutMinP(AliITSReconstructor::GetRecoParam()->GetMultCutMinP());
192 SetCutMinRGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMinRGamma());
193 SetCutMinRK0(AliITSReconstructor::GetRecoParam()->GetMultCutMinRK0());
194 SetCutMinPointAngle(AliITSReconstructor::GetRecoParam()->GetMultCutMinPointAngle());
195 SetCutMaxDCADauther(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCADauther());
196 SetCutMassGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGamma());
197 SetCutMassGammaNSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGammaNSigma());
198 SetCutMassK0(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0());
199 SetCutMassK0NSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0NSigma());
200 SetCutChi2cGamma(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cGamma());
201 SetCutChi2cK0(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cK0());
202 SetCutGammaSFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutGammaSFromDecay());
203 SetCutK0SFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutK0SFromDecay());
204 SetCutMaxDCA(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCA());
210 SetRemoveClustersFromOverlaps();
213 SetPhiRotationAngle();
220 SetCutMinElectronProbTPC();
221 SetCutMinElectronProbESD();
225 SetCutMinPointAngle();
226 SetCutMaxDCADauther();
228 SetCutMassGammaNSigma();
230 SetCutMassK0NSigma();
233 SetCutGammaSFromDecay();
234 SetCutK0SFromDecay();
241 // definition of histograms
242 Bool_t oldStatus = TH1::AddDirectoryStatus();
243 TH1::AddDirectory(kFALSE);
245 fhClustersDPhiAcc = new TH1F("dphiacc", "dphi", 100,-0.1,0.1);
246 fhClustersDThetaAcc = new TH1F("dthetaacc","dtheta",100,-0.1,0.1);
248 fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",100,-0.1,0.1,100,-0.1,0.1);
250 fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,0.0,0.5);
251 fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,0.0,0.5);
253 fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,0.,0.5,100,0.,0.5);
255 fhetaTracklets = new TH1F("etaTracklets", "eta", 100,-2.,2.);
256 fhphiTracklets = new TH1F("phiTracklets", "phi", 100, 0., 2*TMath::Pi());
257 fhetaClustersLay1 = new TH1F("etaClustersLay1", "etaCl1", 100,-2.,2.);
258 fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100, 0., 2*TMath::Pi());
259 for (int i=2;i--;) fStoreRefs[i][0] = fStoreRefs[i][1] = kFALSE;
260 TH1::AddDirectory(oldStatus);
263 //______________________________________________________________________
264 AliITSMultReconstructor::AliITSMultReconstructor(const AliITSMultReconstructor &mr) :
266 fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0),
274 fRemoveClustersFromOverlaps(0),
277 fPhiRotationAngle(0),
283 fCutPxDrSPDout(0.15),
286 fCutMinElectronProbTPC(0.5),
287 fCutMinElectronProbESD(0.1),
291 fCutMinPointAngle(0.98),
292 fCutMaxDCADauther(0.5),
294 fCutMassGammaNSigma(5.),
296 fCutMassK0NSigma(5.),
299 fCutGammaSFromDecay(-10.),
300 fCutK0SFromDecay(-10.),
304 fhClustersDPhiAcc(0),
305 fhClustersDThetaAcc(0),
306 fhClustersDPhiAll(0),
307 fhClustersDThetaAll(0),
308 fhDPhiVsDThetaAll(0),
309 fhDPhiVsDThetaAcc(0),
312 fhetaClustersLay1(0),
313 fhphiClustersLay1(0),
322 fCreateClustersCopy(0),
327 // Copy constructor :!!! RS ATTENTION: old c-tor reassigned the pointers instead of creating a new copy -> would crash on delete
328 AliError("May not use");
331 //______________________________________________________________________
332 AliITSMultReconstructor& AliITSMultReconstructor::operator=(const AliITSMultReconstructor& mr){
333 // Assignment operator
335 this->~AliITSMultReconstructor();
336 new(this) AliITSMultReconstructor(mr);
341 //______________________________________________________________________
342 AliITSMultReconstructor::~AliITSMultReconstructor(){
346 delete fhClustersDPhiAcc;
347 delete fhClustersDThetaAcc;
348 delete fhClustersDPhiAll;
349 delete fhClustersDThetaAll;
350 delete fhDPhiVsDThetaAll;
351 delete fhDPhiVsDThetaAcc;
352 delete fhetaTracklets;
353 delete fhphiTracklets;
354 delete fhetaClustersLay1;
355 delete fhphiClustersLay1;
358 for(Int_t i=0; i<fNTracklets; i++) delete [] fTracklets[i];
360 for(Int_t i=0; i<fNSingleCluster; i++) delete [] fSClusters[i];
363 for (int i=0;i<2;i++) {
364 delete[] fClustersLay[i];
365 delete[] fDetectorIndexClustersLay[i];
366 delete[] fOverlapFlagClustersLay[i];
368 for (int j=0;j<2;j++) delete fUsedClusLay[i][j];
370 delete [] fTracklets;
371 delete [] fSClusters;
373 delete[] fPartners; fPartners = 0;
374 delete[] fMinDists; fMinDists = 0;
375 delete fBlackList; fBlackList = 0;
379 //____________________________________________________________________
380 void AliITSMultReconstructor::Reconstruct(AliESDEvent* esd, TTree* treeRP)
382 if (!treeRP) { AliError(" Invalid ITS cluster tree !\n"); return; }
383 if (!esd) {AliError("ESDEvent is not available, use old reconstructor"); return;}
385 if (fMult) delete fMult; fMult = 0;
386 fNClustersLay[0] = 0;
387 fNClustersLay[1] = 0;
394 // >>>> RS: this part is equivalent to former AliITSVertexer::FindMultiplicity
396 // see if there is a SPD vertex
397 Bool_t isVtxOK=kTRUE, isCosmics=kFALSE;
398 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
399 if (!vtx || vtx->GetNContributors()<1) isVtxOK = kFALSE;
400 if (vtx && strstr(vtx->GetTitle(),"cosmics")) {
407 AliDebug(1,"Tracklets multiplicity not determined because the primary vertex was not found");
408 AliDebug(1,"Just counting the number of cluster-fired chips on the SPD layers");
413 float vtxf[3] = {vtx->GetX(),vtx->GetY(),vtx->GetZ()};
420 CreateMultiplicityObject();
423 //____________________________________________________________________
424 void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
426 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
428 if (fMult) delete fMult; fMult = 0;
429 fNClustersLay[0] = 0;
430 fNClustersLay[1] = 0;
434 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
437 SetTreeRP(clusterTree);
444 //____________________________________________________________________
445 void AliITSMultReconstructor::ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, Float_t* vtx, Float_t*)
448 // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode
450 if (fMult) delete fMult; fMult = 0;
451 fNClustersLay[0] = 0;
452 fNClustersLay[1] = 0;
456 if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
457 if (!clusterTreeMix) { AliError(" Invalid ITS cluster tree 2nd event !\n"); return; }
460 SetTreeRP(clusterTree);
461 SetTreeRPMix(clusterTreeMix);
468 //____________________________________________________________________
469 void AliITSMultReconstructor::FindTracklets(const Float_t *vtx)
471 // - calls LoadClusterArrays that finds the position of the clusters
474 // - convert the cluster coordinates to theta, phi (seen from the
475 // interaction vertex). Clusters in the inner layer can be now
476 // rotated for combinatorial studies
477 // - makes an array of tracklets
479 // After this method has been called, the clusters of the two layers
480 // and the tracklets can be retrieved by calling the Get'er methods.
483 // Find tracklets converging to vertex
485 LoadClusterArrays(fTreeRP,fTreeRPMix);
486 // flag clusters used by ESD tracks
487 if (fESDEvent) ProcessESDTracks();
494 // find the tracklets
495 AliDebug(1,"Looking for tracklets... ");
497 ClusterPos2Angles(vtx); // convert cluster position to angles wrt vtx
499 // Step1: find all tracklets allowing double assocation:
503 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) found += AssociateClusterOfL1(iC1);
506 // Step2: store tracklets; remove used clusters
507 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) StoreTrackletForL2Cluster(iC2);
509 // store unused single clusters of L1
512 AliDebug(1,Form("%d tracklets found", fNTracklets));
515 //____________________________________________________________________
516 void AliITSMultReconstructor::CreateMultiplicityObject()
518 // create AliMultiplicity object and store it in the ESD event
520 TBits fastOrFiredMap,firedChipMap;
522 fastOrFiredMap = fDetTypeRec->GetFastOrFiredMap();
523 firedChipMap = fDetTypeRec->GetFiredChipMap(fTreeRP);
526 fMult = new AliMultiplicity(fNTracklets,fNSingleCluster,fNFiredChips[0],fNFiredChips[1],fastOrFiredMap);
527 fMult->SetMultTrackRefs(kTRUE);
528 // store some details of reco:
529 fMult->SetScaleDThetaBySin2T(fScaleDTBySin2T);
530 fMult->SetDPhiWindow2(fDPhiWindow2);
531 fMult->SetDThetaWindow2(fDThetaWindow2);
532 fMult->SetDPhiShift(fDPhiShift);
533 fMult->SetNStdDev(fNStdDev);
535 fMult->SetFiredChipMap(firedChipMap);
536 AliITSRecPointContainer* rcont = AliITSRecPointContainer::Instance();
537 fMult->SetITSClusters(0,rcont->GetNClustersInLayer(1,fTreeRP));
538 for(Int_t kk=2;kk<=6;kk++) fMult->SetITSClusters(kk-1,rcont->GetNClustersInLayerFast(kk));
541 AliRefArray *refs[2][2] = {{0,0},{0,0}};
543 for (int it=2;it--;) // tracklet_clusters->track references to stor
544 if (fStoreRefs[il][it]) refs[il][it] = new AliRefArray(fNTracklets,0);
546 for (int i=fNTracklets;i--;) {
547 float* tlInfo = fTracklets[i];
548 fMult->SetTrackletData(i,tlInfo);
549 for (int itp=0;itp<2;itp++) {
550 for (int ilr=0;ilr<2;ilr++) {
551 if (!fStoreRefs[ilr][itp]) continue; // nothing to store
552 int clID = int(tlInfo[ilr ? kClID2:kClID1]);
553 int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100);
555 else if (nref==1) refs[ilr][itp]->AddReference(i,shared[0]);
556 else refs[ilr][itp]->AddReferences(i,shared,nref);
560 fMult->AttachTracklet2TrackRefs(refs[0][0],refs[0][1],refs[1][0],refs[1][1]);
562 AliRefArray *refsc[2] = {0,0};
563 for (int it=2;it--;) if (fStoreRefs[0][it]) refsc[it] = new AliRefArray(fNClustersLay[0]);
564 for (int i=fNSingleCluster;i--;) {
565 float* clInfo = fSClusters[i];
566 fMult->SetSingleClusterData(i,clInfo);
567 int clID = int(clInfo[kSCID]);
568 for (int itp=0;itp<2;itp++) {
569 if (!fStoreRefs[0][itp]) continue;
570 int nref = fUsedClusLay[0][itp]->GetReferences(clID,shared,100);
572 else if (nref==1) refsc[itp]->AddReference(i,shared[0]);
573 else refsc[itp]->AddReferences(i,shared,nref);
576 fMult->AttachCluster2TrackRefs(refsc[0],refsc[1]);
577 fMult->CompactBits();
582 //____________________________________________________________________
583 void AliITSMultReconstructor::LoadClusterArrays(TTree* tree, TTree* treeMix)
585 // load cluster info and prepare tracklets arrays
587 if (AreClustersLoaded()) {AliInfo("Clusters are already loaded"); return;}
588 LoadClusterArrays(tree,0);
589 LoadClusterArrays(treeMix ? treeMix:tree,1);
590 int nmaxT = TMath::Min(fNClustersLay[0], fNClustersLay[1]);
591 if (fTracklets) delete[] fTracklets;
592 fTracklets = new Float_t*[nmaxT];
593 memset(fTracklets,0,nmaxT*sizeof(Float_t*));
595 if (fSClusters) delete[] fSClusters;
596 fSClusters = new Float_t*[fNClustersLay[0]];
597 memset(fSClusters,0,fNClustersLay[0]*sizeof(Float_t*));
599 AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay[0],fNClustersLay[1]));
600 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
604 //____________________________________________________________________
605 void AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree, int il)
608 // - gets the clusters from the cluster tree for layer il
609 // - convert them into global coordinates
610 // - store them in the internal arrays
611 // - count the number of cluster-fired chips
613 // RS: This method was strongly modified wrt original. In order to have the same numbering
614 // of clusters as in the ITS reco I had to introduce sorting in Z
615 // Also note that now the clusters data are stored not in float[6] attached to float**, but in 1-D array
616 AliDebug(1,Form("Loading clusters and cluster-fired chips for layer %d",il));
618 fNClustersLay[il] = 0;
619 fNFiredChips[il] = 0;
620 for (int i=2;i--;) fStoreRefs[il][i] = kFALSE;
622 AliITSRecPointContainer* rpcont = 0;
623 static TClonesArray statITSrec("AliITSRecPoint");
624 static TObjArray clArr(100);
626 TClonesArray* itsClusters = 0;
628 if (!fCreateClustersCopy) {
629 rpcont=AliITSRecPointContainer::Instance();
630 itsClusters = rpcont->FetchClusters(0,itsClusterTree);
631 if(!rpcont->IsSPDActive()){
632 AliWarning("No SPD rec points found, multiplicity not calculated");
637 itsClusters = &statITSrec;
638 branch = itsClusterTree->GetBranch("ITSRecPoints");
639 branch->SetAddress(&itsClusters);
640 if (!fClArr[il]) fClArr[il] = new TClonesArray("AliITSRecPoint",100);
644 // loop over the SPD subdetectors
646 int detMin = TMath::Max(0,AliITSgeomTGeo::GetModuleIndex(il+1,1,1));
647 int detMax = AliITSgeomTGeo::GetModuleIndex(il+2,1,1);
648 for (int idt=detMin;idt<detMax;idt++) {
649 if (!fCreateClustersCopy) itsClusters = rpcont->UncheckedGetClusters(idt);
650 else branch->GetEvent(idt);
651 int nClusters = itsClusters->GetEntriesFast();
652 if (!nClusters) continue;
653 Int_t nClustersInChip[5] = {0,0,0,0,0};
655 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
656 if (!cluster) continue;
657 if (fCreateClustersCopy) cluster = new ((*fClArr[il])[nclLayer]) AliITSRecPoint(*cluster);
658 clArr.AddAtAndExpand(cluster,nclLayer++);
659 Int_t chipNo = fSPDSeg.GetChipFromLocal(0,cluster->GetDetLocalZ());
660 if(chipNo>=0)nClustersInChip[ chipNo ]++;
662 for(Int_t ifChip=5;ifChip--;) if (nClustersInChip[ifChip]) fNFiredChips[il]++;
664 // sort the clusters in Z (to have the same numbering as in ITS reco
665 Float_t *z = new Float_t[nclLayer];
666 Int_t *index = new Int_t[nclLayer];
667 for (int ic=0;ic<nclLayer;ic++) z[ic] = ((AliITSRecPoint*)clArr[ic])->GetZ();
668 TMath::Sort(nclLayer,z,index,kFALSE);
669 Float_t* clustersLay = new Float_t[nclLayer*kClNPar];
670 Int_t* detectorIndexClustersLay = new Int_t[nclLayer];
671 Bool_t* overlapFlagClustersLay = new Bool_t[nclLayer];
673 for (int ic=0;ic<nclLayer;ic++) {
674 AliITSRecPoint* cluster = (AliITSRecPoint*)clArr[index[ic]];
675 float* clPar = &clustersLay[ic*kClNPar];
677 cluster->GetGlobalXYZ( clPar );
678 detectorIndexClustersLay[ic] = cluster->GetDetectorIndex();
679 overlapFlagClustersLay[ic] = kFALSE;
680 for (Int_t i=3;i--;) clPar[kClMC0+i] = cluster->GetLabel(i);
686 if (fOverlapFlagClustersLay[il]) delete[] fOverlapFlagClustersLay[il];
687 fOverlapFlagClustersLay[il] = overlapFlagClustersLay;
689 if (fDetectorIndexClustersLay[il]) delete[] fDetectorIndexClustersLay[il];
690 fDetectorIndexClustersLay[il] = detectorIndexClustersLay;
692 for (int it=0;it<2;it++) {
693 if (fUsedClusLay[il][it]) delete fUsedClusLay[il][it];
694 fUsedClusLay[il][it] = new AliRefArray(nclLayer);
697 if (fClustersLay[il]) delete[] fClustersLay[il];
698 fClustersLay[il] = clustersLay;
699 fNClustersLay[il] = nclLayer;
703 //____________________________________________________________________
704 void AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) {
706 // - gets the clusters from the cluster tree
707 // - counts the number of (cluster)fired chips
709 AliDebug(1,"Loading cluster-fired chips ...");
714 AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
715 TClonesArray* itsClusters=NULL;
716 rpcont->FetchClusters(0,itsClusterTree);
717 if(!rpcont->IsSPDActive()){
718 AliWarning("No SPD rec points found, multiplicity not calculated");
722 // loop over the its subdetectors
723 Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1);
724 for (Int_t iIts=0; iIts < nSPDmodules; iIts++) {
725 itsClusters=rpcont->UncheckedGetClusters(iIts);
726 Int_t nClusters = itsClusters->GetEntriesFast();
728 // number of clusters in each chip of the current module
729 Int_t nClustersInChip[5] = {0,0,0,0,0};
732 // loop over clusters
734 AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
736 layer = cluster->GetLayer();
737 if (layer>1) continue;
739 // find the chip for the current cluster
740 Float_t locz = cluster->GetDetLocalZ();
741 Int_t iChip = fSPDSeg.GetChipFromLocal(0,locz);
742 if (iChip>=0) nClustersInChip[iChip]++;
744 }// end of cluster loop
746 // get number of fired chips in the current module
747 for(Int_t ifChip=0; ifChip<5; ifChip++) {
748 if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
751 } // end of its "subdetector" loop
754 AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
756 //____________________________________________________________________
758 AliITSMultReconstructor::SaveHists() {
759 // This method save the histograms on the output file
760 // (only if fHistOn is TRUE).
765 fhClustersDPhiAll->Write();
766 fhClustersDThetaAll->Write();
767 fhDPhiVsDThetaAll->Write();
769 fhClustersDPhiAcc->Write();
770 fhClustersDThetaAcc->Write();
771 fhDPhiVsDThetaAcc->Write();
773 fhetaTracklets->Write();
774 fhphiTracklets->Write();
775 fhetaClustersLay1->Write();
776 fhphiClustersLay1->Write();
779 //____________________________________________________________________
780 void AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist) {
782 Float_t distClSameMod=0.;
783 Float_t distClSameModMin=0.;
785 Float_t meanRadiusLay1 = 3.99335; // average radius inner layer
786 Float_t meanRadiusLay2 = 7.37935; // average radius outer layer;
791 Float_t* clPar1 = GetClusterLayer1(iC1);
792 Float_t* clPar2B = GetClusterLayer2(iC2WithBestDist);
793 // Loop on inner layer clusters
794 for (Int_t iiC1=0; iiC1<fNClustersLay[0]; iiC1++) {
795 if (!fOverlapFlagClustersLay[0][iiC1]) {
796 // only for adjacent modules
797 if ((TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==4)||
798 (TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==76)) {
799 Float_t *clPar11 = GetClusterLayer1(iiC1);
800 Float_t dePhi=TMath::Abs(clPar11[kClPh]-clPar1[kClPh]);
801 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
803 zproj1=meanRadiusLay1/TMath::Tan(clPar1[kClTh]);
804 zproj2=meanRadiusLay1/TMath::Tan(clPar11[kClTh]);
806 deZproj=TMath::Abs(zproj1-zproj2);
808 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
809 if (distClSameMod<=1.) fOverlapFlagClustersLay[0][iiC1]=kTRUE;
811 // if (distClSameMod<=1.) {
812 // if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
813 // distClSameModMin=distClSameMod;
819 } // end adjacent modules
821 } // end Loop on inner layer clusters
823 // if (distClSameModMin!=0.) fOverlapFlagClustersLay[0][iClOverlap]=kTRUE;
828 // Loop on outer layer clusters
829 for (Int_t iiC2=0; iiC2<fNClustersLay[1]; iiC2++) {
830 if (!fOverlapFlagClustersLay[1][iiC2]) {
831 // only for adjacent modules
832 Float_t *clPar2 = GetClusterLayer2(iiC2);
833 if ((TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==4) ||
834 (TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==156)) {
835 Float_t dePhi=TMath::Abs(clPar2[kClPh]-clPar2B[kClPh]);
836 if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
838 zproj1=meanRadiusLay2/TMath::Tan(clPar2B[kClTh]);
839 zproj2=meanRadiusLay2/TMath::Tan(clPar2[kClTh]);
841 deZproj=TMath::Abs(zproj1-zproj2);
842 distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
843 if (distClSameMod<=1.) fOverlapFlagClustersLay[1][iiC2]=kTRUE;
845 // if (distClSameMod<=1.) {
846 // if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
847 // distClSameModMin=distClSameMod;
852 } // end adjacent modules
854 } // end Loop on outer layer clusters
856 // if (distClSameModMin!=0.) fOverlapFlagClustersLay[1][iClOverlap]=kTRUE;
860 //____________________________________________________________________
861 void AliITSMultReconstructor::InitAux()
863 // init arrays/parameters for tracklet reconstruction
865 // dPhi shift is field dependent, get average magnetic field
868 if (TGeoGlobalMagField::Instance()) field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
870 AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor.");
872 else bz = TMath::Abs(field->SolenoidField());
873 fDPhiShift = fPhiShift / 5 * bz;
874 AliDebug(1, Form("Using phi shift of %f", fDPhiShift));
876 if (fPartners) delete[] fPartners; fPartners = new Int_t[fNClustersLay[1]];
877 if (fMinDists) delete[] fMinDists; fMinDists = new Float_t[fNClustersLay[1]];
878 if (fAssociatedLay1) delete[] fAssociatedLay1; fAssociatedLay1 = new Int_t[fNClustersLay[0]];
880 if (fBlackList) delete fBlackList; fBlackList = new AliRefArray(fNClustersLay[0]);
882 // Printf("Vertex in find tracklets...%f %f %f",vtx[0],vtx[1],vtx[2]);
883 for (Int_t i=0; i<fNClustersLay[1]; i++) {
885 fMinDists[i] = 2*fNStdDev;
887 memset(fAssociatedLay1,0,fNClustersLay[0]*sizeof(Int_t));
891 //____________________________________________________________________
892 void AliITSMultReconstructor::ClusterPos2Angles(const Float_t *vtx)
894 // convert cluster coordinates to angles wrt vertex
895 for (int ilr=0;ilr<2;ilr++) {
896 for (Int_t iC=0; iC<fNClustersLay[ilr]; iC++) {
897 float* clPar = GetClusterOfLayer(ilr,iC);
898 CalcThetaPhi(clPar[kClTh]-vtx[0],clPar[kClPh]-vtx[1],clPar[kClZ]-vtx[2],clPar[kClTh],clPar[kClPh]);
900 clPar[kClPh] = clPar[kClPh] + fPhiRotationAngle; // rotation of inner layer for comb studies
902 Float_t eta = clPar[kClTh];
903 eta= TMath::Tan(eta/2.);
904 eta=-TMath::Log(eta);
905 fhetaClustersLay1->Fill(eta);
906 fhphiClustersLay1->Fill(clPar[kClPh]);
914 //____________________________________________________________________
915 Int_t AliITSMultReconstructor::AssociateClusterOfL1(Int_t iC1)
917 // search association of cluster iC1 of L1 with all clusters of L2
918 if (fAssociatedLay1[iC1] != 0) return 0;
919 Int_t iC2WithBestDist = -1; // reset
920 Double_t minDist = 2*fNStdDev; // reset
921 float* clPar1 = GetClusterLayer1(iC1);
922 for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) {
924 if (fBlackList->IsReferred(iC1,iC2)) continue;
925 float* clPar2 = GetClusterLayer2(iC2);
927 // find the difference in angles
928 Double_t dTheta = TMath::Abs(clPar2[kClTh] - clPar1[kClTh]);
929 Double_t dPhi = TMath::Abs(clPar2[kClPh] - clPar1[kClPh]);
930 // Printf("detheta %f dephi %f", dTheta,dPhi);
932 if (dPhi>TMath::Pi()) dPhi=2.*TMath::Pi()-dPhi; // take into account boundary condition
935 fhClustersDPhiAll->Fill(dPhi);
936 fhClustersDThetaAll->Fill(dTheta);
937 fhDPhiVsDThetaAll->Fill(dTheta, dPhi);
939 Float_t d = CalcDist(dPhi,dTheta,clPar1[kClTh]); // make "elliptical" cut in Phi and Theta!
940 // look for the minimum distance: the minimum is in iC2WithBestDist
941 if (d<fNStdDev && d<minDist) { minDist=d; iC2WithBestDist = iC2; }
944 if (minDist<fNStdDev) { // This means that a cluster in layer 2 was found that matches with iC1
946 if (fMinDists[iC2WithBestDist] > minDist) {
947 Int_t oldPartner = fPartners[iC2WithBestDist];
948 fPartners[iC2WithBestDist] = iC1;
949 fMinDists[iC2WithBestDist] = minDist;
951 fAssociatedLay1[iC1] = 1; // mark as assigned
953 if (oldPartner != -1) {
954 // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its fBlackList
955 fBlackList->AddReference(oldPartner,iC2WithBestDist);
956 fAssociatedLay1[oldPartner] = 0; // mark as free
959 // try again to find a cluster without considering iC2WithBestDist
960 fBlackList->AddReference(iC1,iC2WithBestDist);
964 else fAssociatedLay1[iC1] = 2;// cluster has no partner; remove
969 //____________________________________________________________________
970 Int_t AliITSMultReconstructor::StoreTrackletForL2Cluster(Int_t iC2)
972 // build tracklet for cluster iC2 of layer 2
973 if (fPartners[iC2] == -1) return 0;
974 if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (fPartners[iC2],iC2);
975 // Printf("saving tracklets");
976 if (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2]) return 0;
977 float* clPar2 = GetClusterLayer2(iC2);
978 float* clPar1 = GetClusterLayer1(fPartners[iC2]);
980 Float_t* tracklet = fTracklets[fNTracklets] = new Float_t[kTrNPar]; // RS Add also the cluster id's
982 tracklet[kTrTheta] = clPar1[kClTh]; // use the theta from the clusters in the first layer
983 tracklet[kTrPhi] = clPar1[kClPh]; // use the phi from the clusters in the first layer
984 tracklet[kTrDPhi] = clPar1[kClPh] - clPar2[kClPh]; // store the difference between phi1 and phi2
986 // define dphi in the range [0,pi] with proper sign (track charge correlated)
987 if (tracklet[kTrDPhi] > TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]-2.*TMath::Pi();
988 if (tracklet[kTrDPhi] < -TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]+2.*TMath::Pi();
990 tracklet[kTrDTheta] = clPar1[kClTh] - clPar2[kClTh]; // store the theta1-theta2
993 fhClustersDPhiAcc->Fill(tracklet[kTrDPhi]);
994 fhClustersDThetaAcc->Fill(tracklet[kTrDTheta]);
995 fhDPhiVsDThetaAcc->Fill(tracklet[kTrDTheta],tracklet[kTrDPhi]);
999 // if equal label in both clusters found this label is assigned
1000 // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned
1001 Int_t label1=0,label2=0;
1002 while (label2 < 3) {
1003 if ( int(clPar1[kClMC0+label1])!=-2 && int(clPar1[kClMC0+label1])==int(clPar2[kClMC0+label2])) break;
1004 if (++label1 == 3) { label1 = 0; label2++; }
1007 AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n",
1008 (Int_t) clPar1[kClMC0+label1], (Int_t) clPar1[kClMC0+label2], fNTracklets));
1009 tracklet[kTrLab1] = tracklet[kTrLab2] = clPar1[kClMC0+label1];
1011 AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n",
1012 (Int_t) clPar1[kClMC0], (Int_t) clPar1[kClMC1], (Int_t) clPar1[kClMC2],
1013 (Int_t) clPar2[kClMC0], (Int_t) clPar2[kClMC1], (Int_t) clPar2[kClMC2], fNTracklets));
1014 tracklet[kTrLab1] = clPar1[kClMC0];
1015 tracklet[kTrLab2] = clPar2[kClMC0];
1019 Float_t eta = tracklet[kTrTheta];
1020 eta= TMath::Tan(eta/2.);
1021 eta=-TMath::Log(eta);
1022 fhetaTracklets->Fill(eta);
1023 fhphiTracklets->Fill(tracklet[kTrPhi]);
1026 tracklet[kClID1] = fPartners[iC2];
1027 tracklet[kClID2] = iC2;
1029 // Printf("Adding tracklet candidate");
1030 AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
1031 AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", fPartners[iC2], iC2));
1033 fAssociatedLay1[fPartners[iC2]] = 1;
1038 //____________________________________________________________________
1039 void AliITSMultReconstructor::StoreL1Singles()
1041 // Printf("saving single clusters...");
1042 for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) {
1043 float* clPar1 = GetClusterLayer1(iC1);
1044 if (fAssociatedLay1[iC1]==2||fAssociatedLay1[iC1]==0) {
1045 fSClusters[fNSingleCluster] = new Float_t[kClNPar];
1046 fSClusters[fNSingleCluster][kSCTh] = clPar1[kClTh];
1047 fSClusters[fNSingleCluster][kSCPh] = clPar1[kClPh];
1048 fSClusters[fNSingleCluster][kSCLab] = clPar1[kClMC0];
1049 fSClusters[fNSingleCluster][kSCID] = iC1;
1050 AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
1051 fNSingleCluster, iC1));
1058 //____________________________________________________________________
1059 void AliITSMultReconstructor::ProcessESDTracks()
1061 // Flag the clusters used by ESD tracks
1062 // Flag primary tracks to be used for multiplicity counting
1064 if (!fESDEvent) return;
1065 AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexTracks();
1066 if (!vtx || vtx->GetNContributors()<1) vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
1067 if (!vtx || vtx->GetNContributors()<1) {
1068 AliDebug(1,"No primary vertex: cannot flag primary tracks");
1071 Int_t ntracks = fESDEvent->GetNumberOfTracks();
1072 for(Int_t itr=0; itr<ntracks; itr++) {
1073 AliESDtrack* track = fESDEvent->GetTrack(itr);
1074 if (!track->IsOn(AliESDtrack::kITSin)) continue; // use only tracks propagated in ITS to vtx
1075 FlagTrackClusters(itr);
1076 FlagIfSecondary(track,vtx);
1082 //____________________________________________________________________
1083 void AliITSMultReconstructor::FlagTrackClusters(Int_t id)
1085 // RS: flag the SPD clusters of the track if it is useful for the multiplicity estimation
1087 const AliESDtrack* track = fESDEvent->GetTrack(id);
1089 if ( track->GetITSclusters(idx)<3 ) return; // at least 3 clusters must be used in the fit
1090 Int_t itsType = track->IsOn(AliESDtrack::kITSpureSA) ? 1:0;
1092 for (int i=6/*AliESDfriendTrack::kMaxITScluster*/;i--;) { // ignore extras: note: i>=6 is for extra clusters
1093 if (idx[i]<0) continue;
1094 int layID= (idx[i] & 0xf0000000) >> 28;
1095 if (layID>1) continue; // SPD only
1096 int clID = (idx[i] & 0x0fffffff);
1097 fUsedClusLay[layID][itsType]->AddReference(clID,id);
1098 fStoreRefs[layID][itsType] = kTRUE;
1103 //____________________________________________________________________
1104 void AliITSMultReconstructor::FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx)
1106 // RS: check if the track is primary and set the flag
1107 double cut = (track->HasPointOnITSLayer(0)||track->HasPointOnITSLayer(1)) ? fCutPxDrSPDin:fCutPxDrSPDout;
1109 track->GetDZ(vtx->GetX(),vtx->GetY(),vtx->GetZ(), fESDEvent->GetMagneticField(), xz);
1110 if (TMath::Abs(xz[0]*track->P())>cut || TMath::Abs(xz[1]*track->P())>fCutPxDz ||
1111 TMath::Abs(xz[0])>fCutDCArz || TMath::Abs(xz[1])>fCutDCArz)
1112 track->SetStatus(AliESDtrack::kMultSec);
1113 else track->ResetStatus(AliESDtrack::kMultSec);
1116 //____________________________________________________________________
1117 void AliITSMultReconstructor::FlagV0s(const AliESDVertex *vtx)
1119 // flag tracks belonging to v0s
1121 const double kK0Mass = 0.4976;
1124 AliKFVertex vertexKF;
1125 AliKFParticle epKF0,epKF1,pipmKF0,piKF0,piKF1,gammaKF,k0KF;
1126 Double_t mass,massErr,chi2c;
1127 enum {kKFIni=BIT(14)};
1131 vtx->GetXYZ(recVtx);
1132 for (int i=3;i--;) recVtxF[i] = recVtx[i];
1134 int ntracks = fESDEvent->GetNumberOfTracks();
1135 if (ntracks<2) return;
1137 vertexKF.X() = recVtx[0];
1138 vertexKF.Y() = recVtx[1];
1139 vertexKF.Z() = recVtx[2];
1140 vertexKF.Covariance(0,0) = vtx->GetXRes()*vtx->GetXRes();
1141 vertexKF.Covariance(1,2) = vtx->GetYRes()*vtx->GetYRes();
1142 vertexKF.Covariance(2,2) = vtx->GetZRes()*vtx->GetZRes();
1144 AliESDtrack *trc0,*trc1;
1145 for (int it0=0;it0<ntracks;it0++) {
1146 trc0 = fESDEvent->GetTrack(it0);
1147 if (trc0->IsOn(AliESDtrack::kMultInV0)) continue;
1148 if (!trc0->IsOn(AliESDtrack::kITSin)) continue;
1149 Bool_t isSAP = trc0->IsPureITSStandalone();
1150 Int_t q0 = trc0->Charge();
1151 Bool_t testGamma = CanBeElectron(trc0);
1152 epKF0.ResetBit(kKFIni);
1153 piKF0.ResetBit(kKFIni);
1154 double bestChi2=1e16;
1157 for (int it1=it0+1;it1<ntracks;it1++) {
1158 trc1 = fESDEvent->GetTrack(it1);
1159 if (trc1->IsOn(AliESDtrack::kMultInV0)) continue;
1160 if (!trc1->IsOn(AliESDtrack::kITSin)) continue;
1161 if (trc1->IsPureITSStandalone() != isSAP) continue; // pair separately ITS_SA_Pure tracks and TPC/ITS+ITS_SA
1162 if ( (q0+trc1->Charge())!=0 ) continue; // don't pair like signs
1164 pvertex.SetParamN(q0<0 ? *trc0:*trc1);
1165 pvertex.SetParamP(q0>0 ? *trc0:*trc1);
1166 pvertex.Update(recVtxF);
1167 if (pvertex.P()<fCutMinP) continue;
1168 if (pvertex.GetV0CosineOfPointingAngle()<fCutMinPointAngle) continue;
1169 if (pvertex.GetDcaV0Daughters()>fCutMaxDCADauther) continue;
1170 double d = pvertex.GetD(recVtx[0],recVtx[1],recVtx[2]);
1171 if (d>fCutMaxDCA) continue;
1172 double dx=recVtx[0]-pvertex.Xv(), dy=recVtx[1]-pvertex.Yv();
1173 double rv = TMath::Sqrt(dx*dx+dy*dy);
1175 // check gamma conversion hypothesis ----------------------------------------------------------->>>
1176 Bool_t gammaOK = kFALSE;
1177 while (testGamma && CanBeElectron(trc1)) {
1178 if (rv<fCutMinRGamma) break;
1179 if (!epKF0.TestBit(kKFIni)) {
1180 new(&epKF0) AliKFParticle(*trc0,q0>0 ? kPositron:kElectron);
1181 epKF0.SetBit(kKFIni);
1183 new(&epKF1) AliKFParticle(*trc1,q0<0 ? kPositron:kElectron);
1184 gammaKF.Initialize();
1187 gammaKF.SetProductionVertex(vertexKF);
1188 gammaKF.GetMass(mass,massErr);
1189 if (mass>fCutMassGamma || (massErr>0&&(mass>massErr*fCutMassGammaNSigma))) break;
1190 if (gammaKF.GetS()<fCutGammaSFromDecay) break;
1191 gammaKF.SetMassConstraint(0.,0.001);
1192 chi2c = (gammaKF.GetNDF()!=0) ? gammaKF.GetChi2()/gammaKF.GetNDF() : 1000;
1193 if (chi2c>fCutChi2cGamma) break;
1195 if (chi2c>bestChi2) break;
1200 if (gammaOK) continue;
1201 // check gamma conversion hypothesis -----------------------------------------------------------<<<
1202 // check K0 conversion hypothesis ----------------------------------------------------------->>>
1204 if (rv<fCutMinRK0) break;
1205 if (!piKF0.TestBit(kKFIni)) {
1206 new(&piKF0) AliKFParticle(*trc0,q0>0 ? kPiPlus:kPiMinus);
1207 piKF0.SetBit(kKFIni);
1209 new(&piKF1) AliKFParticle(*trc1,q0<0 ? kPiPlus:kPiMinus);
1213 k0KF.SetProductionVertex(vertexKF);
1214 k0KF.GetMass(mass,massErr);
1216 if (TMath::Abs(mass)>fCutMassK0 || (massErr>0&&(abs(mass)>massErr*fCutMassK0NSigma))) break;
1217 if (k0KF.GetS()<fCutK0SFromDecay) break;
1218 k0KF.SetMassConstraint(kK0Mass,0.001);
1219 chi2c = (k0KF.GetNDF()!=0) ? k0KF.GetChi2()/k0KF.GetNDF() : 1000;
1220 if (chi2c>fCutChi2cK0) break;
1221 if (chi2c>bestChi2) break;
1226 // check K0 conversion hypothesis -----------------------------------------------------------<<<
1230 trc0->SetStatus(AliESDtrack::kMultInV0);
1231 fESDEvent->GetTrack(bestID)->SetStatus(AliESDtrack::kMultInV0);
1237 //____________________________________________________________________
1238 Bool_t AliITSMultReconstructor::CanBeElectron(const AliESDtrack* trc) const
1240 // check if the track can be electron
1241 Double_t pid[AliPID::kSPECIES];
1242 if (!trc->IsOn(AliESDtrack::kESDpid)) return kTRUE;
1243 trc->GetESDpid(pid);
1244 return (trc->IsOn(AliESDtrack::kTPCpid)) ?
1245 pid[AliPID::kElectron]>fCutMinElectronProbTPC :
1246 pid[AliPID::kElectron]>fCutMinElectronProbESD;