-//____________________________________________________________________
-//
-// AliITSMultReconstructor - find clusters in the pixels (theta and
-// phi) and tracklets.
+/**************************************************************************
+ * Copyright(c) 2007-2009, ALICE Experiment at CERN, All rights reserved. *
+ * *
+ * Author: The ALICE Off-line Project. *
+ * Contributors are mentioned in the code where appropriate. *
+ * *
+ * Permission to use, copy, modify and distribute this software and its *
+ * documentation strictly for non-commercial purposes is hereby granted *
+ * without fee, provided that the above copyright notice appears in all *
+ * copies and that both the copyright notice and this permission notice *
+ * appear in the supporting documentation. The authors make no claims *
+ * about the suitability of this software for any purpose. It is *
+ * provided "as is" without express or implied warranty. *
+ **************************************************************************/
+
+//_________________________________________________________________________
//
-// These can be used to extract charged particles multiplcicity from the ITS.
+// Implementation of the ITS-SPD trackleter class
//
-// A tracklet consist of two ITS clusters, one in the first pixel
-// layer and one in the second. The clusters are associates if the
-// differencies in Phi (azimuth) and Zeta (longitudinal) are inside
-// a fiducial volume. In case of multiple candidates it is selected the
-// candidate with minimum distance in Phi.
-// The parameter AssociationChoice allows to control if two clusters
-// in layer 2 can be associated to the same cluster in layer 1 or not.
+// It retrieves clusters in the pixels (theta and phi) and finds tracklets.
+// These can be used to extract charged particle multiplicity from the ITS.
//
-// -----------------------------------------------------------------
-//
-// TODO:
+// A tracklet consists of two ITS clusters, one in the first pixel layer and
+// one in the second. The clusters are associated if the differences in
+// Phi (azimuth) and Theta (polar angle) are within fiducial windows.
+// In case of multiple candidates the candidate with minimum
+// distance is selected.
+//
+// Two methods return the number of tracklets and the number of unassociated
+// clusters (i.e. not used in any tracklet) in the first SPD layer
+// (GetNTracklets and GetNSingleClusters)
+//
+// The cuts on phi and theta depend on the interacting system (p-p or Pb-Pb)
+// and can be set via AliITSRecoParam class
+// (SetPhiWindow and SetThetaWindow)
//
-// - Introduce a rough pt estimation from the difference in phi ?
-// - Allow for a more refined selection criterium in case of multiple
-// candidates (for instance by introducing weights for the difference
-// in Phi and Zeta).
+// Origin: Tiziano Virgili
//
-//____________________________________________________________________
-
-#include "AliITSMultReconstructor.h"
-
-#include "TTree.h"
-#include "TH1F.h"
-#include "TH2F.h"
+// Current support and development:
+// Domenico Elia, Maria Nicassio (INFN Bari)
+// Domenico.Elia@ba.infn.it, Maria.Nicassio@ba.infn.it
+//
+// Most recent updates:
+// - multiple association forbidden (fOnlyOneTrackletPerC2 = kTRUE)
+// - phi definition changed to ALICE convention (0,2*TMath::pi())
+// - cluster coordinates taken with GetGlobalXYZ()
+// - fGeometry removed
+// - number of fired chips on the two layers
+// - option to cut duplicates in the overlaps
+// - options and fiducial cuts via AliITSRecoParam
+// - move from DeltaZeta to DeltaTheta cut
+// - update to the new algorithm by Mariella and Jan Fiete
+// - store also DeltaTheta in the ESD
+// - less new and delete calls when creating the needed arrays
+//
+// - RS: to decrease the number of new/deletes the clusters data are stored
+// not in float[6] attached to float**, but in 1-D array.
+// - RS: Clusters are sorted in Z in roder to have the same numbering as in the ITS reco
+// - RS: Clusters used by ESDtrack are flagged, this information is passed to AliMulitiplicity object
+// when storing the tracklets and single cluster info
+// - MN: first MC label of single clusters stored
+//_________________________________________________________________________
+#include <TClonesArray.h>
+#include <TH1F.h>
+#include <TH2F.h>
+#include <TTree.h>
+#include <TBits.h>
+#include <TArrayI.h>
+#include "AliITSMultReconstructor.h"
+#include "AliITSReconstructor.h"
+#include "AliITSsegmentationSPD.h"
#include "AliITSRecPoint.h"
+#include "AliITSRecPointContainer.h"
#include "AliITSgeom.h"
+#include "AliITSgeomTGeo.h"
+#include "AliITSDetTypeRec.h"
+#include "AliESDEvent.h"
+#include "AliESDVertex.h"
+#include "AliESDtrack.h"
+#include "AliMultiplicity.h"
#include "AliLog.h"
+#include "TGeoGlobalMagField.h"
+#include "AliMagF.h"
+#include "AliESDv0.h"
+#include "AliV0.h"
+#include "AliKFParticle.h"
+#include "AliKFVertex.h"
//____________________________________________________________________
ClassImp(AliITSMultReconstructor)
+
//____________________________________________________________________
-AliITSMultReconstructor::AliITSMultReconstructor() {
+AliITSMultReconstructor::AliITSMultReconstructor():
+fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fUsedClusLay1(0),fUsedClusLay2(0),
+fClustersLay1(0),
+fClustersLay2(0),
+fDetectorIndexClustersLay1(0),
+fDetectorIndexClustersLay2(0),
+fOverlapFlagClustersLay1(0),
+fOverlapFlagClustersLay2(0),
+fTracklets(0),
+fSClusters(0),
+fNClustersLay1(0),
+fNClustersLay2(0),
+fNTracklets(0),
+fNSingleCluster(0),
+fPhiWindow(0),
+fThetaWindow(0),
+fPhiShift(0),
+fRemoveClustersFromOverlaps(0),
+fPhiOverlapCut(0),
+fZetaOverlapCut(0),
+//
+fCutPxDrSPDin(0.1),
+fCutPxDrSPDout(0.15),
+fCutPxDz(0.2),
+fCutDCArz(0.5),
+fCutMinElectronProbTPC(0.5),
+fCutMinElectronProbESD(0.1),
+fCutMinP(0.05),
+fCutMinRGamma(2.),
+fCutMinRK0(1.),
+fCutMinPointAngle(0.98),
+fCutMaxDCADauther(0.5),
+fCutMassGamma(0.03),
+fCutMassGammaNSigma(5.),
+fCutMassK0(0.03),
+fCutMassK0NSigma(5.),
+fCutChi2cGamma(2.),
+fCutChi2cK0(2.),
+fCutGammaSFromDecay(-10.),
+fCutK0SFromDecay(-10.),
+fCutMaxDCA(1.),
+//
+fHistOn(0),
+fhClustersDPhiAcc(0),
+fhClustersDThetaAcc(0),
+fhClustersDPhiAll(0),
+fhClustersDThetaAll(0),
+fhDPhiVsDThetaAll(0),
+fhDPhiVsDThetaAcc(0),
+fhetaTracklets(0),
+fhphiTracklets(0),
+fhetaClustersLay1(0),
+fhphiClustersLay1(0){
- fGeometry =0;
+ fNFiredChips[0] = 0;
+ fNFiredChips[1] = 0;
+ // Method to reconstruct the charged particles multiplicity with the
+ // SPD (tracklets).
SetHistOn();
- SetPhiWindow();
- SetZetaWindow();
- SetOnlyOneTrackletPerC2();
-
- fClustersLay1 = new Float_t*[300000];
- fClustersLay2 = new Float_t*[300000];
- fTracklets = new Float_t*[300000];
- fAssociationFlag = new Bool_t[300000];
-
- for(Int_t i=0; i<300000; i++) {
- fClustersLay1[i] = new Float_t[3];
- fClustersLay2[i] = new Float_t[3];
- fTracklets[i] = new Float_t[3];
- fAssociationFlag[i] = kFALSE;
- }
+
+ if(AliITSReconstructor::GetRecoParam()) {
+ SetPhiWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiWindow());
+ SetThetaWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterThetaWindow());
+ SetPhiShift(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiShift());
+ SetRemoveClustersFromOverlaps(AliITSReconstructor::GetRecoParam()->GetTrackleterRemoveClustersFromOverlaps());
+ SetPhiOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiOverlapCut());
+ SetZetaOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterZetaOverlapCut());
+ //
+ SetCutPxDrSPDin(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDin());
+ SetCutPxDrSPDout(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDout());
+ SetCutPxDz(AliITSReconstructor::GetRecoParam()->GetMultCutPxDz());
+ SetCutDCArz(AliITSReconstructor::GetRecoParam()->GetMultCutDCArz());
+ SetCutMinElectronProbTPC(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbTPC());
+ SetCutMinElectronProbESD(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbESD());
+ SetCutMinP(AliITSReconstructor::GetRecoParam()->GetMultCutMinP());
+ SetCutMinRGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMinRGamma());
+ SetCutMinRK0(AliITSReconstructor::GetRecoParam()->GetMultCutMinRK0());
+ SetCutMinPointAngle(AliITSReconstructor::GetRecoParam()->GetMultCutMinPointAngle());
+ SetCutMaxDCADauther(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCADauther());
+ SetCutMassGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGamma());
+ SetCutMassGammaNSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGammaNSigma());
+ SetCutMassK0(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0());
+ SetCutMassK0NSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0NSigma());
+ SetCutChi2cGamma(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cGamma());
+ SetCutChi2cK0(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cK0());
+ SetCutGammaSFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutGammaSFromDecay());
+ SetCutK0SFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutK0SFromDecay());
+ SetCutMaxDCA(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCA());
+ //
+ } else {
+ SetPhiWindow();
+ SetThetaWindow();
+ SetPhiShift();
+ SetRemoveClustersFromOverlaps();
+ SetPhiOverlapCut();
+ SetZetaOverlapCut();
+ //
+ SetCutPxDrSPDin();
+ SetCutPxDrSPDout();
+ SetCutPxDz();
+ SetCutDCArz();
+ SetCutMinElectronProbTPC();
+ SetCutMinElectronProbESD();
+ SetCutMinP();
+ SetCutMinRGamma();
+ SetCutMinRK0();
+ SetCutMinPointAngle();
+ SetCutMaxDCADauther();
+ SetCutMassGamma();
+ SetCutMassGammaNSigma();
+ SetCutMassK0();
+ SetCutMassK0NSigma();
+ SetCutChi2cGamma();
+ SetCutChi2cK0();
+ SetCutGammaSFromDecay();
+ SetCutK0SFromDecay();
+ SetCutMaxDCA();
+ }
+
+ fClustersLay1 = 0;
+ fClustersLay2 = 0;
+ fDetectorIndexClustersLay1 = 0;
+ fDetectorIndexClustersLay2 = 0;
+ fOverlapFlagClustersLay1 = 0;
+ fOverlapFlagClustersLay2 = 0;
+ fTracklets = 0;
+ fSClusters = 0;
// definition of histograms
- fhClustersDPhi = new TH1F("dphi", "dphi", 200,-0.1,0.1);
- fhClustersDPhi->SetDirectory(0);
- fhClustersDTheta = new TH1F("dtheta","dtheta",200,-0.1,0.1);
- fhClustersDTheta->SetDirectory(0);
- fhClustersDZeta = new TH1F("dzeta","dzeta",200,-0.2,0.2);
- fhClustersDZeta->SetDirectory(0);
-
- fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",200,-0.1,0.1,200,-0.1,0.1);
- fhDPhiVsDThetaAll->SetDirectory(0);
- fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",200,-0.1,0.1,200,-0.1,0.1);
- fhDPhiVsDThetaAcc->SetDirectory(0);
+ Bool_t oldStatus = TH1::AddDirectoryStatus();
+ TH1::AddDirectory(kFALSE);
+
+ fhClustersDPhiAcc = new TH1F("dphiacc", "dphi", 100,-0.1,0.1);
+ fhClustersDThetaAcc = new TH1F("dthetaacc","dtheta",100,-0.1,0.1);
+ fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",100,-0.1,0.1,100,-0.1,0.1);
+
+ fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,0.0,0.5);
+ fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,0.0,0.5);
+
+ fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,0.,0.5,100,0.,0.5);
+
+ fhetaTracklets = new TH1F("etaTracklets", "eta", 100,-2.,2.);
+ fhphiTracklets = new TH1F("phiTracklets", "phi", 100, 0., 2*TMath::Pi());
+ fhetaClustersLay1 = new TH1F("etaClustersLay1", "etaCl1", 100,-2.,2.);
+ fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100, 0., 2*TMath::Pi());
+
+ TH1::AddDirectory(oldStatus);
+}
+
+//______________________________________________________________________
+AliITSMultReconstructor::AliITSMultReconstructor(const AliITSMultReconstructor &mr) :
+AliTrackleter(mr),
+fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fUsedClusLay1(0),fUsedClusLay2(0),
+fClustersLay1(0),
+fClustersLay2(0),
+fDetectorIndexClustersLay1(0),
+fDetectorIndexClustersLay2(0),
+fOverlapFlagClustersLay1(0),
+fOverlapFlagClustersLay2(0),
+fTracklets(0),
+fSClusters(0),
+fNClustersLay1(0),
+fNClustersLay2(0),
+fNTracklets(0),
+fNSingleCluster(0),
+fPhiWindow(0),
+fThetaWindow(0),
+fPhiShift(0),
+fRemoveClustersFromOverlaps(0),
+fPhiOverlapCut(0),
+fZetaOverlapCut(0),
+//
+fCutPxDrSPDin(0.1),
+fCutPxDrSPDout(0.15),
+fCutPxDz(0.2),
+fCutDCArz(0.5),
+fCutMinElectronProbTPC(0.5),
+fCutMinElectronProbESD(0.1),
+fCutMinP(0.05),
+fCutMinRGamma(2.),
+fCutMinRK0(1.),
+fCutMinPointAngle(0.98),
+fCutMaxDCADauther(0.5),
+fCutMassGamma(0.03),
+fCutMassGammaNSigma(5.),
+fCutMassK0(0.03),
+fCutMassK0NSigma(5.),
+fCutChi2cGamma(2.),
+fCutChi2cK0(2.),
+fCutGammaSFromDecay(-10.),
+fCutK0SFromDecay(-10.),
+fCutMaxDCA(1.),
+//
+fHistOn(0),
+fhClustersDPhiAcc(0),
+fhClustersDThetaAcc(0),
+fhClustersDPhiAll(0),
+fhClustersDThetaAll(0),
+fhDPhiVsDThetaAll(0),
+fhDPhiVsDThetaAcc(0),
+fhetaTracklets(0),
+fhphiTracklets(0),
+fhetaClustersLay1(0),
+fhphiClustersLay1(0)
+ {
+ // Copy constructor :!!! RS ATTENTION: old c-tor reassigned the pointers instead of creating a new copy -> would crash on delete
+ AliError("May not use");
+}
+
+//______________________________________________________________________
+AliITSMultReconstructor& AliITSMultReconstructor::operator=(const AliITSMultReconstructor& mr){
+ // Assignment operator
+ if (this != &mr) {
+ this->~AliITSMultReconstructor();
+ new(this) AliITSMultReconstructor(mr);
+ }
+ return *this;
}
+//______________________________________________________________________
+AliITSMultReconstructor::~AliITSMultReconstructor(){
+ // Destructor
+
+ // delete histograms
+ delete fhClustersDPhiAcc;
+ delete fhClustersDThetaAcc;
+ delete fhClustersDPhiAll;
+ delete fhClustersDThetaAll;
+ delete fhDPhiVsDThetaAll;
+ delete fhDPhiVsDThetaAcc;
+ delete fhetaTracklets;
+ delete fhphiTracklets;
+ delete fhetaClustersLay1;
+ delete fhphiClustersLay1;
+ delete[] fUsedClusLay1;
+ delete[] fUsedClusLay2;
+ // delete arrays
+ for(Int_t i=0; i<fNTracklets; i++)
+ delete [] fTracklets[i];
+
+ for(Int_t i=0; i<fNSingleCluster; i++)
+ delete [] fSClusters[i];
+
+ delete [] fClustersLay1;
+ delete [] fClustersLay2;
+ delete [] fDetectorIndexClustersLay1;
+ delete [] fDetectorIndexClustersLay2;
+ delete [] fOverlapFlagClustersLay1;
+ delete [] fOverlapFlagClustersLay2;
+ delete [] fTracklets;
+ delete [] fSClusters;
+}
//____________________________________________________________________
-void
-AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
+void AliITSMultReconstructor::Reconstruct(AliESDEvent* esd, TTree* treeRP)
+{
+ if (!treeRP) { AliError(" Invalid ITS cluster tree !\n"); return; }
+ if (!esd) {AliError("ESDEvent is not available, use old reconstructor"); return;}
+ // reset counters
+ if (fMult) delete fMult; fMult = 0;
+ fNClustersLay1 = 0;
+ fNClustersLay2 = 0;
+ fNTracklets = 0;
+ fNSingleCluster = 0;
+ //
+ fESDEvent = esd;
+ fTreeRP = treeRP;
+ //
+ // >>>> RS: this part is equivalent to former AliITSVertexer::FindMultiplicity
+ //
+ // see if there is a SPD vertex
+ Bool_t isVtxOK=kTRUE, isCosmics=kFALSE;
+ AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
+ if (!vtx || vtx->GetNContributors()<1) isVtxOK = kFALSE;
+ if (vtx && strstr(vtx->GetTitle(),"cosmics")) {
+ isVtxOK = kFALSE;
+ isCosmics = kTRUE;
+ }
+ //
+ if (!isVtxOK) {
+ if (!isCosmics) {
+ AliDebug(1,"Tracklets multiplicity not determined because the primary vertex was not found");
+ AliDebug(1,"Just counting the number of cluster-fired chips on the SPD layers");
+ }
+ vtx = 0;
+ }
+ if(vtx){
+ float vtxf[3] = {vtx->GetX(),vtx->GetY(),vtx->GetZ()};
+ FindTracklets(vtxf);
+ }
+ else {
+ FindTracklets(0);
+ }
+ //
+ CreateMultiplicityObject();
+}
+
+//____________________________________________________________________
+void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
+ //
+ // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder
+
+ if (fMult) delete fMult; fMult = 0;
+ fNClustersLay1 = 0;
+ fNClustersLay2 = 0;
+ fNTracklets = 0;
+ fNSingleCluster = 0;
+ //
+ if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; }
+ //
+ fESDEvent = 0;
+ fTreeRP = clusterTree;
+ //
+ FindTracklets(vtx);
//
- // - calls LoadClusterArray that finds the position of the clusters
+}
+
+//____________________________________________________________________
+void AliITSMultReconstructor::FindTracklets(const Float_t *vtx)
+{
+
+ // - calls LoadClusterArrays that finds the position of the clusters
// (in global coord)
// - convert the cluster coordinates to theta, phi (seen from the
- // interaction vertex). The third coordinate is used for ....
+ // interaction vertex).
// - makes an array of tracklets
//
// After this method has been called, the clusters of the two layers
// and the tracklets can be retrieved by calling the Get'er methods.
- // reset counters
- fNClustersLay1 = 0;
- fNClustersLay2 = 0;
- fNTracklets = 0;
- // loading the clusters
- LoadClusterArrays(clusterTree);
+ // Find tracklets converging to vertex
+ //
+ LoadClusterArrays(fTreeRP);
+ // flag clusters used by ESD tracks
+ if (fESDEvent) ProcessESDTracks();
+
+ if (!vtx) return;
+
+ const Double_t pi = TMath::Pi();
+
+ // dPhi shift is field dependent
+ // get average magnetic field
+ Float_t bz = 0;
+ AliMagF* field = 0;
+ if (TGeoGlobalMagField::Instance()) field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
+ if (!field)
+ {
+ AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor.")
+ }
+ else
+ bz = TMath::Abs(field->SolenoidField());
+
+ const Double_t dPhiShift = fPhiShift / 5 * bz;
+ AliDebug(1, Form("Using phi shift of %f", dPhiShift));
+
+ const Double_t dPhiWindow2 = fPhiWindow * fPhiWindow;
+ const Double_t dThetaWindow2 = fThetaWindow * fThetaWindow;
+ Int_t* partners = new Int_t[fNClustersLay2];
+ Float_t* minDists = new Float_t[fNClustersLay2];
+ Int_t* associatedLay1 = new Int_t[fNClustersLay1];
+ TArrayI** blacklist = new TArrayI*[fNClustersLay1];
+
+ for (Int_t i=0; i<fNClustersLay2; i++) {
+ partners[i] = -1;
+ minDists[i] = 2;
+ }
+ for (Int_t i=0; i<fNClustersLay1; i++)
+ associatedLay1[i] = 0;
+ for (Int_t i=0; i<fNClustersLay1; i++)
+ blacklist[i] = 0;
+
// find the tracklets
AliDebug(1,"Looking for tracklets... ");
-
+
//###########################################################
// Loop on layer 1 : finding theta, phi and z
for (Int_t iC1=0; iC1<fNClustersLay1; iC1++) {
- Float_t x = fClustersLay1[iC1][0] - vtx[0];
- Float_t y = fClustersLay1[iC1][1] - vtx[1];
- Float_t z = fClustersLay1[iC1][2] - vtx[2];
+ float *clPar = GetClusterLayer1(iC1);
+ Float_t x = clPar[kClTh] - vtx[0];
+ Float_t y = clPar[kClPh] - vtx[1];
+ Float_t z = clPar[kClZ] - vtx[2];
+
+ Float_t r = TMath::Sqrt(x*x + y*y + z*z);
- Float_t r = TMath::Sqrt(TMath::Power(x,2) +
- TMath::Power(y,2) +
- TMath::Power(z,2));
+ clPar[kClTh] = TMath::ACos(z/r); // Store Theta
+ clPar[kClPh] = TMath::Pi() + TMath::ATan2(-y,-x); // Store Phi
- fClustersLay1[iC1][0] = TMath::ACos(z/r); // Store Theta
- fClustersLay1[iC1][1] = TMath::ATan(y/x); // Store Phi
- fClustersLay1[iC1][2] = z/r; // Store scaled z
+ if (fHistOn) {
+ Float_t eta = clPar[kClTh];
+ eta= TMath::Tan(eta/2.);
+ eta=-TMath::Log(eta);
+ fhetaClustersLay1->Fill(eta);
+ fhphiClustersLay1->Fill(clPar[kClPh]);
+ }
}
// Loop on layer 2 : finding theta, phi and r
for (Int_t iC2=0; iC2<fNClustersLay2; iC2++) {
- Float_t x = fClustersLay2[iC2][0] - vtx[0];
- Float_t y = fClustersLay2[iC2][1] - vtx[1];
- Float_t z = fClustersLay2[iC2][2] - vtx[2];
-
- Float_t r = TMath::Sqrt(TMath::Power(x,2) +
- TMath::Power(y,2) +
- TMath::Power(z,2));
-
- fClustersLay2[iC2][0] = TMath::ACos(z/r); // Store Theta
- fClustersLay2[iC2][1] = TMath::ATan(y/x); // Store Phi
- fClustersLay2[iC2][2] = z; // Store z
+ float *clPar = GetClusterLayer2(iC2);
+ Float_t x = clPar[kClTh] - vtx[0];
+ Float_t y = clPar[kClPh] - vtx[1];
+ Float_t z = clPar[kClZ] - vtx[2];
+
+ Float_t r = TMath::Sqrt(x*x + y*y + z*z);
- // this only needs to be initialized for the fNClustersLay2 first associations
- fAssociationFlag[iC2] = kFALSE;
+ clPar[kClTh] = TMath::ACos(z/r); // Store Theta
+ clPar[kClPh] = TMath::Pi() + TMath::ATan2(-y,-x); // Store Phi
}
//###########################################################
- // Loop on layer 1
- for (Int_t iC1=0; iC1<fNClustersLay1; iC1++) {
+ Int_t found = 1;
+ while (found > 0) {
+ found = 0;
+
+ // Step1: find all tracklets allowing double assocation
+ // Loop on layer 1
+ for (Int_t iC1=0; iC1<fNClustersLay1; iC1++) {
+
+ // already used ?
+ if (associatedLay1[iC1] != 0) continue;
+
+ found++;
+
+ // reset of variables for multiple candidates
+ Int_t iC2WithBestDist = -1; // reset
+ Double_t minDist = 2; // reset
+ float* clPar1 = GetClusterLayer1(iC1);
+
+ // Loop on layer 2
+ for (Int_t iC2=0; iC2<fNClustersLay2; iC2++) {
+
+ float* clPar2 = GetClusterLayer2(iC2);
+
+ if (blacklist[iC1]) {
+ Bool_t blacklisted = kFALSE;
+ for (Int_t i=blacklist[iC1]->GetSize(); i--;) {
+ if (blacklist[iC1]->At(i) == iC2) {
+ blacklisted = kTRUE;
+ break;
+ }
+ }
+ if (blacklisted) continue;
+ }
- // reset of variables for multiple candidates
- Int_t iC2WithBestPhi = 0; // reset
- Float_t dPhimin = 100.; // just to put a huge number!
-
- // Loop on layer 2
- for (Int_t iC2=0; iC2<fNClustersLay2; iC2++) {
-
- // The following excludes double associations
- if (!fAssociationFlag[iC2]) {
-
// find the difference in angles
- Float_t dTheta = fClustersLay2[iC2][0] - fClustersLay1[iC1][0];
- Float_t dPhi = fClustersLay2[iC2][1] - fClustersLay1[iC1][1];
-
- // find the difference in z (between linear projection from layer 1
- // and the actual point: Dzeta= z1/r1*r2 -z2)
- Float_t r2 = fClustersLay2[iC2][2]/TMath::Cos(fClustersLay2[iC2][0]);
- Float_t dZeta = fClustersLay2[iC1][2]*r2 - fClustersLay2[iC2][2];
-
- if (fHistOn) {
- fhClustersDPhi->Fill(dPhi);
- fhClustersDTheta->Fill(dTheta);
- fhClustersDZeta->Fill(dZeta);
+ Double_t dTheta = TMath::Abs(clPar2[kClTh] - clPar1[kClTh]);
+ Double_t dPhi = TMath::Abs(clPar2[kClPh] - clPar1[kClPh]);
+ // take into account boundary condition
+ if (dPhi>pi) dPhi=2.*pi-dPhi;
+
+ if (fHistOn) {
+ fhClustersDPhiAll->Fill(dPhi);
+ fhClustersDThetaAll->Fill(dTheta);
fhDPhiVsDThetaAll->Fill(dTheta, dPhi);
}
- // make "elliptical" cut in Phi and Zeta!
- Float_t d = TMath::Sqrt(TMath::Power(dPhi/fPhiWindow,2) + TMath::Power(dZeta/fZetaWindow,2));
- if (d>1) continue;
-
- //look for the minimum distance in Phi: the minimum is in iC2WithBestPhi
- if (TMath::Abs(dPhi) < dPhimin) {
- dPhimin = TMath::Abs(dPhi);
- iC2WithBestPhi = iC2;
+
+ dPhi -= dPhiShift;
+
+ // make "elliptical" cut in Phi and Theta!
+ Float_t d = dPhi*dPhi/dPhiWindow2 + dTheta*dTheta/dThetaWindow2;
+
+ // look for the minimum distance: the minimum is in iC2WithBestDist
+ if (d<1 && d<minDist) {
+ minDist=d;
+ iC2WithBestDist = iC2;
}
- }
- } // end of loop over clusters in layer 2
+ } // end of loop over clusters in layer 2
- if (dPhimin<100) { // This means that a cluster in layer 2 was found that mathes with iC1
-
- if (fOnlyOneTrackletPerC2) fAssociationFlag[iC2WithBestPhi] = kTRUE; // flag the association
-
- // store the tracklet
-
- // use the average theta from the clusters in the two layers
- fTracklets[fNTracklets][0] = 0.5*(fClustersLay1[iC1][0]+fClustersLay2[iC2WithBestPhi][0]);
- // use the phi from the clusters in the first layer
- fTracklets[fNTracklets][1] = fClustersLay1[iC1][1];
- // Store the difference between phi1 and phi2
- fTracklets[fNTracklets][2] = fClustersLay1[iC1][1] - fClustersLay2[iC2WithBestPhi][1];
- fNTracklets++;
-
- AliDebug(1,Form(" Adding tracklet candidate %d (cluster %d of layer 1 and %d of layer 2)", fNTracklets, iC1));
+ if (minDist<1) { // This means that a cluster in layer 2 was found that matches with iC1
+
+ if (minDists[iC2WithBestDist] > minDist) {
+ Int_t oldPartner = partners[iC2WithBestDist];
+ partners[iC2WithBestDist] = iC1;
+ minDists[iC2WithBestDist] = minDist;
+
+ // mark as assigned
+ associatedLay1[iC1] = 1;
+
+ if (oldPartner != -1) {
+ // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its blacklist
+ if (blacklist[oldPartner] == 0) {
+ blacklist[oldPartner] = new TArrayI(1);
+ } else blacklist[oldPartner]->Set(blacklist[oldPartner]->GetSize()+1);
+
+ blacklist[oldPartner]->AddAt(iC2WithBestDist, blacklist[oldPartner]->GetSize()-1);
+
+ // mark as free
+ associatedLay1[oldPartner] = 0;
+ }
+ } else {
+ // try again to find a cluster without considering iC2WithBestDist
+ if (blacklist[iC1] == 0) {
+ blacklist[iC1] = new TArrayI(1);
+ }
+ else
+ blacklist[iC1]->Set(blacklist[iC1]->GetSize()+1);
+
+ blacklist[iC1]->AddAt(iC2WithBestDist, blacklist[iC1]->GetSize()-1);
+ }
+
+ } else // cluster has no partner; remove
+ associatedLay1[iC1] = 2;
+ } // end of loop over clusters in layer 1
+ }
+
+ // Step2: store tracklets; remove used clusters
+ for (Int_t iC2=0; iC2<fNClustersLay2; iC2++) {
+
+ if (partners[iC2] == -1) continue;
+
+ if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (partners[iC2],iC2);
+
+
+ if (fOverlapFlagClustersLay1[partners[iC2]] || fOverlapFlagClustersLay2[iC2]) continue;
+
+ float* clPar2 = GetClusterLayer2(iC2);
+ float* clPar1 = GetClusterLayer1(partners[iC2]);
+
+ Float_t* tracklet = fTracklets[fNTracklets] = new Float_t[kTrNPar]; // RS Add also the cluster id's
+
+ // use the theta from the clusters in the first layer
+ tracklet[kTrTheta] = clPar1[kClTh];
+ // use the phi from the clusters in the first layer
+ tracklet[kTrPhi] = clPar1[kClPh];
+ // store the difference between phi1 and phi2
+ tracklet[kTrDPhi] = clPar1[kClPh] - clPar2[kClPh];
+
+ // define dphi in the range [0,pi] with proper sign (track charge correlated)
+ if (tracklet[kTrDPhi] > TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]-2.*TMath::Pi();
+ if (tracklet[kTrDPhi] < -TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]+2.*TMath::Pi();
+
+ // store the difference between theta1 and theta2
+ tracklet[kTrDTheta] = clPar1[kClTh] - clPar2[kClTh];
+
+ if (fHistOn) {
+ fhClustersDPhiAcc->Fill(tracklet[kTrDPhi]);
+ fhClustersDThetaAcc->Fill(tracklet[kTrDTheta]);
+ fhDPhiVsDThetaAcc->Fill(tracklet[kTrDTheta],tracklet[kTrDPhi]);
+ }
+
+ // find label
+ // if equal label in both clusters found this label is assigned
+ // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned
+ Int_t label1 = 0;
+ Int_t label2 = 0;
+ while (label2 < 3) {
+ if ((Int_t) clPar1[kClMC0+label1] != -2 && (Int_t) clPar1[kClMC0+label1] == (Int_t) clPar2[kClMC0+label2])
+ break;
+ label1++;
+ if (label1 == 3) {
+ label1 = 0;
+ label2++;
+ }
+ }
+ if (label2 < 3) {
+ AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n", (Int_t) clPar1[kClMC0+label1], (Int_t) clPar1[kClMC0+label2], fNTracklets));
+ tracklet[kTrLab1] = clPar1[kClMC0+label1];
+ tracklet[kTrLab2] = clPar2[kClMC0+label2];
+ } else {
+ AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n", (Int_t) clPar1[kClMC0], (Int_t) clPar1[kClMC1], (Int_t) clPar1[kClMC2], (Int_t) clPar2[kClMC0], (Int_t) clPar2[kClMC1], (Int_t) clPar2[kClMC2], fNTracklets));
+ tracklet[kTrLab1] = clPar1[kClMC0];
+ tracklet[kTrLab2] = clPar2[kClMC0];
+ }
+
+ if (fHistOn) {
+ Float_t eta = tracklet[kTrTheta];
+ eta= TMath::Tan(eta/2.);
+ eta=-TMath::Log(eta);
+ fhetaTracklets->Fill(eta);
+ fhphiTracklets->Fill(tracklet[kTrPhi]);
}
- } // end of loop over clusters in layer 1
+ //
+ tracklet[kClID1] = partners[iC2];
+ tracklet[kClID2] = iC2;
+ //
+ AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
+ AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", partners[iC2], iC2));
+ fNTracklets++;
+
+ associatedLay1[partners[iC2]] = 1;
+ }
+ // Delete the following else if you do not want to save Clusters!
+ // store the cluster
+ for (Int_t iC1=0; iC1<fNClustersLay1; iC1++) {
+
+ float* clPar1 = GetClusterLayer1(iC1);
+
+ if (associatedLay1[iC1]==2||associatedLay1[iC1]==0) {
+ fSClusters[fNSingleCluster] = new Float_t[kClNPar];
+ fSClusters[fNSingleCluster][kSCTh] = clPar1[kClTh];
+ fSClusters[fNSingleCluster][kSCPh] = clPar1[kClPh];
+ fSClusters[fNSingleCluster][kSCLab] = clPar1[kClMC0];
+ fSClusters[fNSingleCluster][kSCID] = iC1;
+ AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
+ fNSingleCluster, iC1));
+ fNSingleCluster++;
+ }
+ }
+
+ delete[] partners;
+ delete[] minDists;
+
+ for (Int_t i=0; i<fNClustersLay1; i++)
+ if (blacklist[i])
+ delete blacklist[i];
+ delete[] blacklist;
+
AliDebug(1,Form("%d tracklets found", fNTracklets));
}
//____________________________________________________________________
-void
-AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree) {
+void AliITSMultReconstructor::CreateMultiplicityObject()
+{
+ // create AliMultiplicity object and store it in the ESD event
+ //
+ TBits fastOrFiredMap,firedChipMap;
+ if (fDetTypeRec) {
+ fastOrFiredMap = fDetTypeRec->GetFastOrFiredMap();
+ firedChipMap = fDetTypeRec->GetFiredChipMap(fTreeRP);
+ }
+ //
+ fMult = new AliMultiplicity(fNTracklets,fNSingleCluster,fNFiredChips[0],fNFiredChips[1],fastOrFiredMap);
+ fMult->SetFiredChipMap(firedChipMap);
+ AliITSRecPointContainer* rcont = AliITSRecPointContainer::Instance();
+ fMult->SetITSClusters(0,rcont->GetNClustersInLayer(1,fTreeRP));
+ for(Int_t kk=2;kk<=6;kk++) fMult->SetITSClusters(kk-1,rcont->GetNClustersInLayerFast(kk));
+ //
+ for (int i=fNTracklets;i--;) {
+ float* tlInfo = fTracklets[i];
+ fMult->SetTrackletData(i,tlInfo, fUsedClusLay1[int(tlInfo[kClID1])],fUsedClusLay2[int(tlInfo[kClID2])]);
+ }
+ //
+ for (int i=fNSingleCluster;i--;) {
+ float* clInfo = fSClusters[i];
+ fMult->SetSingleClusterData(i,clInfo,fUsedClusLay1[int(clInfo[kSCID])]);
+ }
+ fMult->CompactBits();
+ //
+}
+
+
+//____________________________________________________________________
+void AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree)
+{
// This method
// - gets the clusters from the cluster tree
// - convert them into global coordinates
// - store them in the internal arrays
+ // - count the number of cluster-fired chips
+ //
+ // RS: This method was strongly modified wrt original. In order to have the same numbering
+ // of clusters as in the ITS reco I had to introduce sorting in Z
+ // Also note that now the clusters data are stored not in float[6] attached to float**, but in 1-D array
- AliDebug(1,"Loading clusters ...");
+ AliDebug(1,"Loading clusters and cluster-fired chips ...");
fNClustersLay1 = 0;
fNClustersLay2 = 0;
+ fNFiredChips[0] = 0;
+ fNFiredChips[1] = 0;
+
+ AliITSsegmentationSPD seg;
+
+ AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
+ TClonesArray* itsClusters=rpcont->FetchClusters(0,itsClusterTree);
+ if(!rpcont->IsSPDActive()){
+ AliWarning("No SPD rec points found, multiplicity not calculated");
+ return;
+ }
+ //
+ // count clusters
+ // loop over the SPD subdetectors
+ TObjArray clArr(100);
+ for (int il=0;il<2;il++) {
+ int nclLayer = 0;
+ int detMin = AliITSgeomTGeo::GetModuleIndex(il+1,1,1);
+ int detMax = AliITSgeomTGeo::GetModuleIndex(il+2,1,1);
+ for (int idt=detMin;idt<detMax;idt++) {
+ itsClusters=rpcont->UncheckedGetClusters(idt);
+ int nClusters = itsClusters->GetEntriesFast();
+ if (!nClusters) continue;
+ Int_t nClustersInChip[5] = {0,0,0,0,0};
+ while(nClusters--) {
+ AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
+ if (!cluster) continue;
+ clArr.AddAtAndExpand(cluster,nclLayer++);
+ nClustersInChip[ seg.GetChipFromLocal(0,cluster->GetDetLocalZ()) ]++;
+ }
+ for(Int_t ifChip=5;ifChip--;) if (nClustersInChip[ifChip]) fNFiredChips[il]++;
+ }
+ // sort the clusters in Z (to have the same numbering as in ITS reco
+ Float_t *z = new Float_t[nclLayer];
+ Int_t * index = new Int_t[nclLayer];
+ for (int ic=0;ic<nclLayer;ic++) z[ic] = ((AliITSRecPoint*)clArr[ic])->GetZ();
+ TMath::Sort(nclLayer,z,index,kFALSE);
+ Float_t* clustersLay = new Float_t[nclLayer*kClNPar];
+ Int_t* detectorIndexClustersLay = new Int_t[nclLayer];
+ Bool_t* overlapFlagClustersLay = new Bool_t[nclLayer];
+ UInt_t* usedClusLay = new UInt_t[nclLayer];
+ //
+ for (int ic=0;ic<nclLayer;ic++) {
+ AliITSRecPoint* cluster = (AliITSRecPoint*)clArr[index[ic]];
+ float* clPar = &clustersLay[ic*kClNPar];
+ //
+ cluster->GetGlobalXYZ( clPar );
+ detectorIndexClustersLay[ic] = cluster->GetDetectorIndex();
+ overlapFlagClustersLay[ic] = kFALSE;
+ usedClusLay[ic] = 0;
+ for (Int_t i=3;i--;) clPar[kClMC0+i] = cluster->GetLabel(i);
+ }
+ clArr.Clear();
+ delete[] z;
+ delete[] index;
+ //
+ if (il==0) {
+ fClustersLay1 = clustersLay;
+ fOverlapFlagClustersLay1 = overlapFlagClustersLay;
+ fDetectorIndexClustersLay1 = detectorIndexClustersLay;
+ fUsedClusLay1 = usedClusLay;
+ fNClustersLay1 = nclLayer;
+ }
+ else {
+ fClustersLay2 = clustersLay;
+ fOverlapFlagClustersLay2 = overlapFlagClustersLay;
+ fDetectorIndexClustersLay2 = detectorIndexClustersLay;
+ fUsedClusLay2 = usedClusLay;
+ fNClustersLay2 = nclLayer;
+ }
+ }
+ //
+ // no double association allowed
+ int nmaxT = TMath::Min(fNClustersLay1, fNClustersLay2);
+ fTracklets = new Float_t*[nmaxT];
+ fSClusters = new Float_t*[fNClustersLay1];
+ for (Int_t i=nmaxT;i--;) fTracklets[i] = 0;
+ //
+ AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay1,fNClustersLay2));
+ AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
+}
+//____________________________________________________________________
+void
+AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) {
+ // This method
+ // - gets the clusters from the cluster tree
+ // - counts the number of (cluster)fired chips
- TClonesArray* itsClusters = new TClonesArray("AliITSRecPoint");
- TBranch* itsClusterBranch=itsClusterTree->GetBranch("ITSRecPoints");
- itsClusterBranch->SetAddress(&itsClusters);
+ AliDebug(1,"Loading cluster-fired chips ...");
- Int_t nItsSubs = (Int_t)itsClusterTree->GetEntries();
+ fNFiredChips[0] = 0;
+ fNFiredChips[1] = 0;
+ AliITSsegmentationSPD seg;
+ AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
+ TClonesArray* itsClusters=rpcont->FetchClusters(0,itsClusterTree);
+ if(!rpcont->IsSPDActive()){
+ AliWarning("No SPD rec points found, multiplicity not calculated");
+ return;
+ }
+
// loop over the its subdetectors
- for (Int_t iIts=0; iIts < nItsSubs; iIts++) {
-
- if (!itsClusterTree->GetEvent(iIts))
- continue;
-
+ Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1);
+ for (Int_t iIts=0; iIts < nSPDmodules; iIts++) {
+ itsClusters=rpcont->UncheckedGetClusters(iIts);
Int_t nClusters = itsClusters->GetEntriesFast();
-
- // stuff needed to get the global coordinates
- Double_t rot[9]; fGeometry->GetRotMatrix(iIts,rot);
- Int_t lay,lad,det; fGeometry->GetModuleId(iIts,lay,lad,det);
- Float_t tx,ty,tz; fGeometry->GetTrans(lay,lad,det,tx,ty,tz);
-
- // Below:
- // "alpha" is the angle from the global X-axis to the
- // local GEANT X'-axis ( rot[0]=cos(alpha) and rot[1]=sin(alpha) )
- // "phi" is the angle from the global X-axis to the
- // local cluster X"-axis
-
- Double_t alpha = TMath::ATan2(rot[1],rot[0])+TMath::Pi();
- Double_t itsPhi = TMath::Pi()/2+alpha;
-
- if (lay==1) itsPhi+=TMath::Pi();
- Double_t cp=TMath::Cos(itsPhi), sp=TMath::Sin(itsPhi);
- Double_t r=tx*cp+ty*sp;
+
+ // number of clusters in each chip of the current module
+ Int_t nClustersInChip[5] = {0,0,0,0,0};
+ Int_t layer = 0;
// loop over clusters
while(nClusters--) {
- AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
-
- if (cluster->GetLayer()>1)
- continue;
+ AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
- Float_t x = r*cp - cluster->GetY()*sp;
- Float_t y = r*sp + cluster->GetY()*cp;
- Float_t z = cluster->GetZ();
-
- if (cluster->GetLayer()==0) {
- fClustersLay1[fNClustersLay1][0] = x;
- fClustersLay1[fNClustersLay1][1] = y;
- fClustersLay1[fNClustersLay1][2] = z;
- fNClustersLay1++;
- }
- if (cluster->GetLayer()==1) {
- fClustersLay2[fNClustersLay2][0] = x;
- fClustersLay2[fNClustersLay2][1] = y;
- fClustersLay2[fNClustersLay2][2] = z;
- fNClustersLay2++;
- }
+ layer = cluster->GetLayer();
+ if (layer>1) continue;
+
+ // find the chip for the current cluster
+ Float_t locz = cluster->GetDetLocalZ();
+ Int_t iChip = seg.GetChipFromLocal(0,locz);
+ nClustersInChip[iChip]++;
}// end of cluster loop
+
+ // get number of fired chips in the current module
+ for(Int_t ifChip=0; ifChip<5; ifChip++) {
+ if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
+ }
+
} // end of its "subdetector" loop
- AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay1,fNClustersLay2));
+
+ AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
}
//____________________________________________________________________
void
AliITSMultReconstructor::SaveHists() {
+ // This method save the histograms on the output file
+ // (only if fHistOn is TRUE).
if (!fHistOn)
return;
- fhClustersDPhi->Write();
- fhClustersDTheta->Write();
- fhClustersDZeta->Write();
+ fhClustersDPhiAll->Write();
+ fhClustersDThetaAll->Write();
fhDPhiVsDThetaAll->Write();
+
+ fhClustersDPhiAcc->Write();
+ fhClustersDThetaAcc->Write();
fhDPhiVsDThetaAcc->Write();
+
+ fhetaTracklets->Write();
+ fhphiTracklets->Write();
+ fhetaClustersLay1->Write();
+ fhphiClustersLay1->Write();
+}
+
+//____________________________________________________________________
+void
+AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist) {
+
+ Float_t distClSameMod=0.;
+ Float_t distClSameModMin=0.;
+ Int_t iClOverlap =0;
+ Float_t meanRadiusLay1 = 3.99335; // average radius inner layer
+ Float_t meanRadiusLay2 = 7.37935; // average radius outer layer;
+
+ Float_t zproj1=0.;
+ Float_t zproj2=0.;
+ Float_t deZproj=0.;
+ Float_t* clPar1 = GetClusterLayer1(iC1);
+ Float_t* clPar2B = GetClusterLayer2(iC2WithBestDist);
+ // Loop on inner layer clusters
+ for (Int_t iiC1=0; iiC1<fNClustersLay1; iiC1++) {
+ if (!fOverlapFlagClustersLay1[iiC1]) {
+ // only for adjacent modules
+ if ((TMath::Abs(fDetectorIndexClustersLay1[iC1]-fDetectorIndexClustersLay1[iiC1])==4)||
+ (TMath::Abs(fDetectorIndexClustersLay1[iC1]-fDetectorIndexClustersLay1[iiC1])==76)) {
+ Float_t *clPar11 = GetClusterLayer1(iiC1);
+ Float_t dePhi=TMath::Abs(clPar11[kClPh]-clPar1[kClPh]);
+ if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
+
+ zproj1=meanRadiusLay1/TMath::Tan(clPar1[kClTh]);
+ zproj2=meanRadiusLay1/TMath::Tan(clPar11[kClTh]);
+
+ deZproj=TMath::Abs(zproj1-zproj2);
+
+ distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
+ if (distClSameMod<=1.) fOverlapFlagClustersLay1[iiC1]=kTRUE;
+
+// if (distClSameMod<=1.) {
+// if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
+// distClSameModMin=distClSameMod;
+// iClOverlap=iiC1;
+// }
+// }
+
+
+ } // end adjacent modules
+ }
+ } // end Loop on inner layer clusters
+
+// if (distClSameModMin!=0.) fOverlapFlagClustersLay1[iClOverlap]=kTRUE;
+
+ distClSameMod=0.;
+ distClSameModMin=0.;
+ iClOverlap =0;
+ // Loop on outer layer clusters
+ for (Int_t iiC2=0; iiC2<fNClustersLay2; iiC2++) {
+ if (!fOverlapFlagClustersLay2[iiC2]) {
+ // only for adjacent modules
+ Float_t *clPar2 = GetClusterLayer2(iiC2);
+ if ((TMath::Abs(fDetectorIndexClustersLay2[iC2WithBestDist]-fDetectorIndexClustersLay2[iiC2])==4) ||
+ (TMath::Abs(fDetectorIndexClustersLay2[iC2WithBestDist]-fDetectorIndexClustersLay2[iiC2])==156)) {
+ Float_t dePhi=TMath::Abs(clPar2[kClPh]-clPar2B[kClPh]);
+ if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
+
+ zproj1=meanRadiusLay2/TMath::Tan(clPar2B[kClTh]);
+ zproj2=meanRadiusLay2/TMath::Tan(clPar2[kClTh]);
+
+ deZproj=TMath::Abs(zproj1-zproj2);
+ distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
+ if (distClSameMod<=1.) fOverlapFlagClustersLay2[iiC2]=kTRUE;
+
+// if (distClSameMod<=1.) {
+// if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
+// distClSameModMin=distClSameMod;
+// iClOverlap=iiC2;
+// }
+// }
+
+ } // end adjacent modules
+ }
+ } // end Loop on outer layer clusters
+
+// if (distClSameModMin!=0.) fOverlapFlagClustersLay2[iClOverlap]=kTRUE;
+
+}
+
+//____________________________________________________________________
+void AliITSMultReconstructor::ProcessESDTracks()
+{
+ // Flag the clusters used by ESD tracks
+ // Flag primary tracks to be used for multiplicity counting
+ //
+ if (!fESDEvent) return;
+ AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexTracks();
+ if (!vtx || vtx->GetNContributors()<1) vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD();
+ if (!vtx || vtx->GetNContributors()<1) {
+ AliDebug(1,"No primary vertex: cannot flag primary tracks");
+ return;
+ }
+ Int_t ntracks = fESDEvent->GetNumberOfTracks();
+ for(Int_t itr=0; itr<ntracks; itr++) {
+ AliESDtrack* track = fESDEvent->GetTrack(itr);
+ if (!track->IsOn(AliESDtrack::kITSin)) continue; // use only tracks propagated in ITS to vtx
+ FlagTrackClusters(itr);
+ FlagIfSecondary(track,vtx);
+ }
+ FlagV0s(vtx);
+ //
+}
+
+//____________________________________________________________________
+void AliITSMultReconstructor::FlagTrackClusters(Int_t id)
+{
+ // RS: flag the SPD clusters of the track if it is useful for the multiplicity estimation
+ //
+ const UShort_t kMaxTrID = 0xffff - 1; // max possible track id
+ if (id>kMaxTrID) return;
+ const AliESDtrack* track = fESDEvent->GetTrack(id);
+ Int_t idx[12];
+ if ( track->GetITSclusters(idx)<3 ) return; // at least 3 clusters must be used in the fit
+ UInt_t *uClus[2] = {fUsedClusLay1,fUsedClusLay2};
+ //
+ UInt_t mark = id+1;
+ if (track->IsOn(AliESDtrack::kITSpureSA)) mark <<= 16;
+ //
+ for (int i=AliESDfriendTrack::kMaxITScluster;i--;) {
+ // note: i>=6 is for extra clusters
+ if (idx[i]<0) continue;
+ int layID= (idx[i] & 0xf0000000) >> 28;
+ if (layID>1) continue; // SPD only
+ int clID = (idx[i] & 0x0fffffff);
+ uClus[layID][clID] |= mark;
+ }
+ //
+}
+
+//____________________________________________________________________
+void AliITSMultReconstructor::FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx)
+{
+ // RS: check if the track is primary and set the flag
+ double cut = (track->HasPointOnITSLayer(0)||track->HasPointOnITSLayer(1)) ? fCutPxDrSPDin:fCutPxDrSPDout;
+ float xz[2];
+ track->GetDZ(vtx->GetX(),vtx->GetY(),vtx->GetZ(), fESDEvent->GetMagneticField(), xz);
+ if (TMath::Abs(xz[0]*track->P())>cut || TMath::Abs(xz[1]*track->P())>fCutPxDz ||
+ TMath::Abs(xz[0])>fCutDCArz || TMath::Abs(xz[1])>fCutDCArz)
+ track->SetStatus(AliESDtrack::kMultSec);
+ else track->ResetStatus(AliESDtrack::kMultSec);
+}
+
+//____________________________________________________________________
+void AliITSMultReconstructor::FlagV0s(const AliESDVertex *vtx)
+{
+ // flag tracks belonging to v0s
+ //
+ const double kK0Mass = 0.4976;
+ //
+ AliV0 pvertex;
+ AliKFVertex vertexKF;
+ AliKFParticle epKF0,epKF1,pipmKF0,piKF0,piKF1,gammaKF,k0KF;
+ Double_t mass,massErr,chi2c;
+ enum {kKFIni=BIT(14)};
+ //
+ double recVtx[3];
+ float recVtxF[3];
+ vtx->GetXYZ(recVtx);
+ for (int i=3;i--;) recVtxF[i] = recVtx[i];
+ //
+ int ntracks = fESDEvent->GetNumberOfTracks();
+ if (ntracks<2) return;
+ //
+ vertexKF.X() = recVtx[0];
+ vertexKF.Y() = recVtx[1];
+ vertexKF.Z() = recVtx[2];
+ vertexKF.Covariance(0,0) = vtx->GetXRes()*vtx->GetXRes();
+ vertexKF.Covariance(1,2) = vtx->GetYRes()*vtx->GetYRes();
+ vertexKF.Covariance(2,2) = vtx->GetZRes()*vtx->GetZRes();
+ //
+ AliESDtrack *trc0,*trc1;
+ for (int it0=0;it0<ntracks;it0++) {
+ trc0 = fESDEvent->GetTrack(it0);
+ if (trc0->IsOn(AliESDtrack::kMultInV0)) continue;
+ if (!trc0->IsOn(AliESDtrack::kITSin)) continue;
+ Bool_t isSAP = trc0->IsPureITSStandalone();
+ Int_t q0 = trc0->Charge();
+ Bool_t testGamma = CanBeElectron(trc0);
+ epKF0.ResetBit(kKFIni);
+ piKF0.ResetBit(kKFIni);
+ double bestChi2=1e16;
+ int bestID = -1;
+ //
+ for (int it1=it0+1;it1<ntracks;it1++) {
+ trc1 = fESDEvent->GetTrack(it1);
+ if (trc1->IsOn(AliESDtrack::kMultInV0)) continue;
+ if (!trc1->IsOn(AliESDtrack::kITSin)) continue;
+ if (trc1->IsPureITSStandalone() != isSAP) continue; // pair separately ITS_SA_Pure tracks and TPC/ITS+ITS_SA
+ if ( (q0+trc1->Charge())!=0 ) continue; // don't pair like signs
+ //
+ pvertex.SetParamN(q0<0 ? *trc0:*trc1);
+ pvertex.SetParamP(q0>0 ? *trc0:*trc1);
+ pvertex.Update(recVtxF);
+ if (pvertex.P()<fCutMinP) continue;
+ if (pvertex.GetV0CosineOfPointingAngle()<fCutMinPointAngle) continue;
+ if (pvertex.GetDcaV0Daughters()>fCutMaxDCADauther) continue;
+ double d = pvertex.GetD(recVtx[0],recVtx[1],recVtx[2]);
+ if (d>fCutMaxDCA) continue;
+ double dx=recVtx[0]-pvertex.Xv(), dy=recVtx[1]-pvertex.Yv();
+ double rv = TMath::Sqrt(dx*dx+dy*dy);
+ //
+ // check gamma conversion hypothesis ----------------------------------------------------------->>>
+ Bool_t gammaOK = kFALSE;
+ while (testGamma && CanBeElectron(trc1)) {
+ if (rv<fCutMinRGamma) break;
+ if (!epKF0.TestBit(kKFIni)) {
+ new(&epKF0) AliKFParticle(*trc0,q0>0 ? kPositron:kElectron);
+ epKF0.SetBit(kKFIni);
+ }
+ new(&epKF1) AliKFParticle(*trc1,q0<0 ? kPositron:kElectron);
+ gammaKF.Initialize();
+ gammaKF += epKF0;
+ gammaKF += epKF1;
+ gammaKF.SetProductionVertex(vertexKF);
+ gammaKF.GetMass(mass,massErr);
+ if (mass>fCutMassGamma || (massErr>0&&(mass>massErr*fCutMassGammaNSigma))) break;
+ if (gammaKF.GetS()<fCutGammaSFromDecay) break;
+ gammaKF.SetMassConstraint(0.,0.001);
+ chi2c = (gammaKF.GetNDF()!=0) ? gammaKF.GetChi2()/gammaKF.GetNDF() : 1000;
+ if (chi2c>fCutChi2cGamma) break;
+ gammaOK = kTRUE;
+ if (chi2c>bestChi2) break;
+ bestChi2 = chi2c;
+ bestID = it1;
+ break;
+ }
+ if (gammaOK) continue;
+ // check gamma conversion hypothesis -----------------------------------------------------------<<<
+ // check K0 conversion hypothesis ----------------------------------------------------------->>>
+ while (1) {
+ if (rv<fCutMinRK0) break;
+ if (!piKF0.TestBit(kKFIni)) {
+ new(&piKF0) AliKFParticle(*trc0,q0>0 ? kPiPlus:kPiMinus);
+ piKF0.SetBit(kKFIni);
+ }
+ new(&piKF1) AliKFParticle(*trc1,q0<0 ? kPiPlus:kPiMinus);
+ k0KF.Initialize();
+ k0KF += piKF0;
+ k0KF += piKF1;
+ k0KF.SetProductionVertex(vertexKF);
+ k0KF.GetMass(mass,massErr);
+ mass -= kK0Mass;
+ if (TMath::Abs(mass)>fCutMassK0 || (massErr>0&&(abs(mass)>massErr*fCutMassK0NSigma))) break;
+ if (k0KF.GetS()<fCutK0SFromDecay) break;
+ k0KF.SetMassConstraint(kK0Mass,0.001);
+ chi2c = (k0KF.GetNDF()!=0) ? k0KF.GetChi2()/k0KF.GetNDF() : 1000;
+ if (chi2c>fCutChi2cK0) break;
+ if (chi2c>bestChi2) break;
+ bestChi2 = chi2c;
+ bestID = it1;
+ break;
+ }
+ // check K0 conversion hypothesis -----------------------------------------------------------<<<
+ }
+ //
+ if (bestID>=0) {
+ trc0->SetStatus(AliESDtrack::kMultInV0);
+ fESDEvent->GetTrack(bestID)->SetStatus(AliESDtrack::kMultInV0);
+ }
+ }
+ //
+}
+
+//____________________________________________________________________
+Bool_t AliITSMultReconstructor::CanBeElectron(const AliESDtrack* trc) const
+{
+ // check if the track can be electron
+ Double_t pid[AliPID::kSPECIES];
+ if (!trc->IsOn(AliESDtrack::kESDpid)) return kTRUE;
+ trc->GetESDpid(pid);
+ return (trc->IsOn(AliESDtrack::kTPCpid)) ?
+ pid[AliPID::kElectron]>fCutMinElectronProbTPC :
+ pid[AliPID::kElectron]>fCutMinElectronProbESD;
+ //
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff