/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
* See cxx source for full Copyright notice */
-/* $Id$ */
-
-/////////////////////////////////////////////////////////////////////////
-//
-// AliITSMultReconstructor - find clusters in the pixels (theta and
-// phi) and tracklets.
+//_________________________________________________________________________
//
-// 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 boolean fOnlyOneTrackletPerC2 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.
//
-/////////////////////////////////////////////////////////////////////////
-
-#include "TObject.h"
+// 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.
+//_________________________________________________________________________
+#include "AliTrackleter.h"
+#include "AliITSsegmentationSPD.h"
+#include "TMath.h"
+class TBits;
class TTree;
class TH1F;
class TH2F;
-
+class AliITSDetTypeRec;
class AliITSgeom;
+class AliESDEvent;
+class AliESDtrack;
+class AliVertex;
+class AliESDVertex;
+class AliMultiplicity;
+class AliRefArray;
+class AliITSRecPoint;
-class AliITSMultReconstructor : public TObject
+class AliITSMultReconstructor : public AliTrackleter
{
public:
+ //
+ enum {kClTh,kClPh,kClZ,kClMC0,kClMC1,kClMC2,kClNPar};
+ enum {kTrTheta,kTrPhi,kTrDPhi,kTrDTheta,kTrLab1,kTrLab2,kClID1,kClID2,kTrNPar};
+ enum {kSCTh,kSCPh,kSCLab,kSCID,kSCNPar};
+ enum {kITSTPC,kITSSAP,kITSTPCBit=BIT(kITSTPC),kITSSAPBit=BIT(kITSSAP)}; // RS
AliITSMultReconstructor();
virtual ~AliITSMultReconstructor();
- void Reconstruct(TTree* tree, Float_t* vtx, Float_t* vtxRes);
+ void Reconstruct(AliESDEvent* esd, TTree* treeRP);
+ void Reconstruct(TTree* tree, Float_t* vtx, Float_t* vtxRes=0); // old reconstructor invocation
+ void ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, const Float_t* vtx, Float_t* vtrRes=0);
+ void FindTracklets(const Float_t* vtx);
void LoadClusterFiredChips(TTree* tree);
void FlagClustersInOverlapRegions(Int_t ic1,Int_t ic2);
-
+ void FlagTrackClusters(Int_t id);
+ void FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx);
+ void FlagV0s(const AliESDVertex *vtx);
+ void ProcessESDTracks();
+ Bool_t CanBeElectron(const AliESDtrack* trc) const;
+
+ virtual void CreateMultiplicityObject();
+ //
// Following members are set via AliITSRecoParam
- void SetOnlyOneTrackletPerC2(Bool_t b = kTRUE) {fOnlyOneTrackletPerC2 = b;}
- void SetPhiWindow(Float_t w=0.08) {fPhiWindow=w;}
- void SetZetaWindow(Float_t w=1.) {fZetaWindow=w;}
+ void SetPhiWindow(Float_t w=0.08) {fDPhiWindow=w; fDPhiWindow2 = w*w;}
+ void SetThetaWindow(Float_t w=0.025) {fDThetaWindow=w; fDThetaWindow2=w*w;}
+ void SetPhiShift(Float_t w=0.0045) {fPhiShift=w;}
void SetRemoveClustersFromOverlaps(Bool_t b = kFALSE) {fRemoveClustersFromOverlaps = b;}
void SetPhiOverlapCut(Float_t w=0.005) {fPhiOverlapCut=w;}
void SetZetaOverlapCut(Float_t w=0.05) {fZetaOverlapCut=w;}
+ void SetPhiRotationAngle(Float_t w=0.0) {fPhiRotationAngle=w;}
- Int_t GetNClustersLayer1() const {return fNClustersLay1;}
- Int_t GetNClustersLayer2() const {return fNClustersLay2;}
+ Int_t GetNClustersLayer1() const {return fNClustersLay[0];}
+ Int_t GetNClustersLayer2() const {return fNClustersLay[1];}
+ Int_t GetNClustersLayer(Int_t i) const {return fNClustersLay[i];}
Int_t GetNTracklets() const {return fNTracklets;}
Int_t GetNSingleClusters() const {return fNSingleCluster;}
+ Int_t GetNSingleClustersLr(int lr) const {return lr==0 ? fNSingleCluster-fNSingleClusterSPD2:(GetStoreSPD2SingleCl() ? fNSingleClusterSPD2 : -1) ;}
Short_t GetNFiredChips(Int_t layer) const {return fNFiredChips[layer];}
- Float_t* GetClusterLayer1(Int_t n) {return fClustersLay1[n];}
- Float_t* GetClusterLayer2(Int_t n) {return fClustersLay2[n];}
- Float_t* GetTracklet(Int_t n) {return fTracklets[n];}
- Float_t* GetCluster(Int_t n) {return fSClusters[n];}
+ Float_t* GetClusterLayer1(Int_t n) const {return &fClustersLay[0][n*kClNPar];}
+ Float_t* GetClusterLayer2(Int_t n) const {return &fClustersLay[1][n*kClNPar];}
+ Float_t* GetClusterOfLayer(Int_t lr,Int_t n) const {return &fClustersLay[lr][n*kClNPar];}
+ Int_t GetClusterCopyIndex(Int_t lr,Int_t n) const {return fClusterCopyIndex[lr] ? fClusterCopyIndex[lr][n] : -1;}
+ AliITSRecPoint* GetRecPoint(Int_t lr, Int_t n) const;
+
+ Float_t* GetTracklet(Int_t n) const {return fTracklets[n];}
+ Float_t* GetCluster(Int_t n) const {return fSClusters[n];}
+ void SetScaleDThetaBySin2T(Bool_t v=kTRUE) {fScaleDTBySin2T = v;}
+ Bool_t GetScaleDThetaBySin2T() const {return fScaleDTBySin2T;}
+ //
+ void SetNStdDev(Float_t f=1.) {fNStdDev = f<0.01 ? 0.01 : f; fNStdDevSq=TMath::Sqrt(fNStdDev);}
+ Float_t GetNStdDev() const {return fNStdDev;}
+ //
void SetHistOn(Bool_t b=kFALSE) {fHistOn=b;}
void SaveHists();
-
-protected:
+ //
+ void SetBuildRefs(Bool_t v=kTRUE) {fBuildRefs = v;}
+ Bool_t GetBuildRefs() const {return fBuildRefs;}
+ //
+ void SetStoreSPD2SingleCl(Bool_t v) {fStoreSPD2SingleCl = v;}
+ Bool_t GetStoreSPD2SingleCl() const {return fStoreSPD2SingleCl;}
+ //
+ AliITSDetTypeRec *GetDetTypeRec() const {return fDetTypeRec;}
+ void SetDetTypeRec(AliITSDetTypeRec *ptr){fDetTypeRec = ptr;}
+ //
+ void SetCutPxDrSPDin(Float_t v=0.1) { fCutPxDrSPDin = v;}
+ void SetCutPxDrSPDout(Float_t v=0.15) { fCutPxDrSPDout = v;}
+ void SetCutPxDz(Float_t v=0.2) { fCutPxDz = v;}
+ void SetCutDCArz(Float_t v=0.5) { fCutDCArz = v;}
+ void SetCutMinElectronProbTPC(Float_t v=0.5) { fCutMinElectronProbTPC = v;}
+ void SetCutMinElectronProbESD(Float_t v=0.1) { fCutMinElectronProbESD = v;}
+ void SetCutMinP(Float_t v=0.05) { fCutMinP = v;}
+ void SetCutMinRGamma(Float_t v=2.) { fCutMinRGamma = v;}
+ void SetCutMinRK0(Float_t v=1.) { fCutMinRK0 = v;}
+ void SetCutMinPointAngle(Float_t v=0.98) { fCutMinPointAngle = v;}
+ void SetCutMaxDCADauther(Float_t v=0.5) { fCutMaxDCADauther = v;}
+ void SetCutMassGamma(Float_t v=0.03) { fCutMassGamma = v;}
+ void SetCutMassGammaNSigma(Float_t v=5.) { fCutMassGammaNSigma = v;}
+ void SetCutMassK0(Float_t v=0.03) { fCutMassK0 = v;}
+ void SetCutMassK0NSigma(Float_t v=5.) { fCutMassK0NSigma = v;}
+ void SetCutChi2cGamma(Float_t v=2.) { fCutChi2cGamma = v;}
+ void SetCutChi2cK0(Float_t v=2.) { fCutChi2cK0 = v;}
+ void SetCutGammaSFromDecay(Float_t v=-10.) { fCutGammaSFromDecay = v;}
+ void SetCutK0SFromDecay(Float_t v=-10.) { fCutK0SFromDecay = v;}
+ void SetCutMaxDCA(Float_t v=1.) { fCutMaxDCA = v;}
+ //
+ Float_t GetCutPxDrSPDin() const {return fCutPxDrSPDin;}
+ Float_t GetCutPxDrSPDout() const {return fCutPxDrSPDout;}
+ Float_t GetCutPxDz() const {return fCutPxDz;}
+ Float_t GetCutDCArz() const {return fCutDCArz;}
+ Float_t GetCutMinElectronProbTPC() const {return fCutMinElectronProbTPC;}
+ Float_t GetCutMinElectronProbESD() const {return fCutMinElectronProbESD;}
+ Float_t GetCutMinP() const {return fCutMinP;}
+ Float_t GetCutMinRGamma() const {return fCutMinRGamma;}
+ Float_t GetCutMinRK0() const {return fCutMinRK0;}
+ Float_t GetCutMinPointAngle() const {return fCutMinPointAngle;}
+ Float_t GetCutMaxDCADauther() const {return fCutMaxDCADauther;}
+ Float_t GetCutMassGamma() const {return fCutMassGamma;}
+ Float_t GetCutMassGammaNSigma() const {return fCutMassGammaNSigma;}
+ Float_t GetCutMassK0() const {return fCutMassK0;}
+ Float_t GetCutMassK0NSigma() const {return fCutMassK0NSigma;}
+ Float_t GetCutChi2cGamma() const {return fCutChi2cGamma;}
+ Float_t GetCutChi2cK0() const {return fCutChi2cK0;}
+ Float_t GetCutGammaSFromDecay() const {return fCutGammaSFromDecay;}
+ Float_t GetCutK0SFromDecay() const {return fCutK0SFromDecay;}
+ Float_t GetCutMaxDCA() const {return fCutMaxDCA;}
+ //
+ void InitAux();
+ void ClusterPos2Angles(const Float_t *vtx);
+ void ClusterPos2Angles(Float_t *clPar, const Float_t *vtx) const;
+ Int_t AssociateClusterOfL1(Int_t iC1);
+ Int_t StoreTrackletForL2Cluster(Int_t iC2);
+ void StoreL1Singles();
+ TClonesArray* GetClustersOfLayer(Int_t il) const {return fClArr[il];}
+ void LoadClusters() {LoadClusterArrays(fTreeRP);}
+ void SetTreeRP(TTree* rp) {fTreeRP = rp;}
+ void SetTreeRPMix(TTree* rp=0) {fTreeRPMix = rp;}
+ Bool_t AreClustersLoaded() const {return fClustersLoaded;}
+ Bool_t GetCreateClustersCopy() const {return fCreateClustersCopy;}
+ Bool_t IsRecoDone() const {return fRecoDone;}
+ void SetCreateClustersCopy(Bool_t v=kTRUE) {fCreateClustersCopy=v;}
+ //
+ // Float_t* GetClustersArray(Int_t lr) const {return (Float_t*) (lr==0) ? fClustersLay[0]:fClustersLay[1];}
+ Float_t* GetClustersArray(Int_t lr) const {if(lr==0){return fClustersLay[0];}
+ else {return fClustersLay[1];}}
+ Int_t* GetPartnersOfL2() const {return (Int_t*)fPartners;}
+ Float_t* GetMinDistsOfL2() const {return (Float_t*)fMinDists;}
+ Double_t GetDPhiShift() const {return fDPhiShift;}
+ Double_t GetDPhiWindow2() const {return fDPhiWindow2;}
+ Double_t GetDThetaWindow2() const {return fDThetaWindow2;}
+ Double_t CalcDist(Double_t dphi, Double_t dtheta, Double_t theta) const;
+ //
+ protected:
+ void SetClustersLoaded(Bool_t v=kTRUE) {fClustersLoaded = v;}
AliITSMultReconstructor(const AliITSMultReconstructor& mr);
AliITSMultReconstructor& operator=(const AliITSMultReconstructor& mr);
+ void CalcThetaPhi(float dx,float dy,float dz,float &theta,float &phi) const;
+ AliITSDetTypeRec* fDetTypeRec; //! pointer to DetTypeRec
+ AliESDEvent* fESDEvent; //! pointer to ESD event
+ TTree* fTreeRP; //! ITS recpoints
+ TTree* fTreeRPMix; //! ITS recpoints for mixing
+ AliRefArray* fUsedClusLay[2][2]; //! RS: clusters usage in ESD tracks
+ //
+ Float_t* fClustersLay[2]; //! clusters in the SPD layers of ITS
+ Int_t* fDetectorIndexClustersLay[2]; //! module index for clusters in ITS layers
+ Int_t* fClusterCopyIndex[2]; //! when clusters copy is requested, store here the reference on the index
+ Bool_t* fOverlapFlagClustersLay[2]; //! flag for clusters in the overlap regions in ITS layers
+ Float_t** fTracklets; //! tracklets
+ Float_t** fSClusters; //! single clusters (unassociated)
- Float_t** fClustersLay1; // clusters in the 1st layer of ITS
- Float_t** fClustersLay2; // clusters in the 2nd layer of ITS
- Int_t* fDetectorIndexClustersLay1; // module index for clusters 1st ITS layer
- Int_t* fDetectorIndexClustersLay2; // module index for clusters 2nd ITS layer
- Bool_t* fOverlapFlagClustersLay1; // flag for clusters in the overlap regions 1st ITS layer
- Bool_t* fOverlapFlagClustersLay2; // flag for clusters in the overlap regions 2nd ITS layer
-
-
- Float_t** fTracklets; // tracklets
- Float_t** fSClusters; // single clusters (unassociated)
- Bool_t* fAssociationFlag; // flag for the associations
-
- Int_t fNClustersLay1; // Number of clusters (Layer1)
- Int_t fNClustersLay2; // Number of clusters (Layer2)
+ Int_t fNClustersLay[2]; // Number of clusters on each layer
Int_t fNTracklets; // Number of tracklets
Int_t fNSingleCluster; // Number of unassociated clusters
+ Int_t fNSingleClusterSPD2; // Number of unassociated clusters on 2nd lr
Short_t fNFiredChips[2]; // Number of fired chips in the two SPD layers
-
+ //
// Following members are set via AliITSRecoParam
- Bool_t fOnlyOneTrackletPerC2; // Allow only one tracklet per cluster in the outer layer
- Float_t fPhiWindow; // Search window in phi
- Float_t fZetaWindow; // Search window in eta
+ //
+ Float_t fDPhiWindow; // Search window in phi
+ Float_t fDThetaWindow; // Search window in theta
+ Float_t fPhiShift; // Phi shift reference value (at 0.5 T)
Bool_t fRemoveClustersFromOverlaps; // Option to skip clusters in the overlaps
Float_t fPhiOverlapCut; // Fiducial window in phi for overlap cut
Float_t fZetaOverlapCut; // Fiducial window in eta for overlap cut
+ Float_t fPhiRotationAngle; // Angle to rotate the inner layer cluster for combinatorial reco only
+ //
+ Bool_t fScaleDTBySin2T; // use in distance definition
+ Float_t fNStdDev; // number of standard deviations to keep
+ Float_t fNStdDevSq; // sqrt of number of standard deviations to keep
+ //
+ // cuts for secondaries identification
+ Float_t fCutPxDrSPDin; // max P*DR for primaries involving at least 1 SPD
+ Float_t fCutPxDrSPDout; // max P*DR for primaries not involving any SPD
+ Float_t fCutPxDz; // max P*DZ for primaries
+ Float_t fCutDCArz; // max DR or DZ for primares
+ //
+ // cuts for flagging tracks in V0s
+ Float_t fCutMinElectronProbTPC; // min probability for e+/e- PID involving TPC
+ Float_t fCutMinElectronProbESD; // min probability for e+/e- PID not involving TPC
+ //
+ Float_t fCutMinP; // min P of V0
+ Float_t fCutMinRGamma; // min transv. distance from ESDVertex to V0 for gammas
+ Float_t fCutMinRK0; // min transv. distance from ESDVertex to V0 for K0s
+ Float_t fCutMinPointAngle; // min pointing angle cosine
+ Float_t fCutMaxDCADauther; // max DCA of daughters at V0
+ Float_t fCutMassGamma; // max gamma mass
+ Float_t fCutMassGammaNSigma; // max standard deviations from 0 for gamma
+ Float_t fCutMassK0; // max K0 mass difference from PGD value
+ Float_t fCutMassK0NSigma; // max standard deviations for K0 mass from PDG value
+ Float_t fCutChi2cGamma; // max constrained chi2 cut for gammas
+ Float_t fCutChi2cK0; // max constrained chi2 cut for K0s
+ Float_t fCutGammaSFromDecay; // min path*P for gammas
+ Float_t fCutK0SFromDecay; // min path*P for K0s
+ Float_t fCutMaxDCA; // max DCA for V0 at ESD vertex
Bool_t fHistOn; // Option to define and fill the histograms
TH1F* fhClustersDPhiAcc; // Phi2 - Phi1 for tracklets
TH1F* fhClustersDThetaAcc; // Theta2 - Theta1 for tracklets
- TH1F* fhClustersDZetaAcc; // z2 - z1projected for tracklets
TH1F* fhClustersDPhiAll; // Phi2 - Phi1 all the combinations
TH1F* fhClustersDThetaAll; // Theta2 - Theta1 all the combinations
- TH1F* fhClustersDZetaAll; // z2 - z1projected all the combinations
TH2F* fhDPhiVsDThetaAll; // 2D plot for all the combinations
TH2F* fhDPhiVsDThetaAcc; // same plot for tracklets
- TH2F* fhDPhiVsDZetaAll; // 2d plot for all the combination
- TH2F* fhDPhiVsDZetaAcc; // same plot for tracklets
TH1F* fhetaTracklets; // Pseudorapidity distr. for tracklets
TH1F* fhphiTracklets; // Azimuthal (Phi) distr. for tracklets
TH1F* fhetaClustersLay1; // Pseudorapidity distr. for Clusters L. 1
TH1F* fhphiClustersLay1; // Azimuthal (Phi) distr. for Clusters L. 1
+ // temporary stuff for single event trackleting
+ Double_t fDPhiShift; // shift in dphi due to the curvature
+ Double_t fDPhiWindow2; // phi window^2
+ Double_t fDThetaWindow2; // theta window^2
+ Int_t* fPartners; //! L2 partners of L1
+ Int_t* fAssociatedLay1; //! association flag
+ Float_t* fMinDists; //! smallest distances for L2->L1
+ AliRefArray* fBlackList; //! blacklisted cluster references
+ Bool_t fStoreRefs[2][2]; //! which cluster to track refs to store
+ //
+ // this is for the analysis mode only
+ TClonesArray *fClArr[2]; //! original clusters
+ Bool_t fCreateClustersCopy; // read and clone clusters directly from the tree
+ Bool_t fClustersLoaded; // flag of clusters loaded
+ Bool_t fRecoDone; // flag that reconstruction is done
+ Bool_t fBuildRefs; // build cluster to tracks references
+ Bool_t fStoreSPD2SingleCl; // do we store SPD2 singles
+ //
+ AliITSsegmentationSPD fSPDSeg; // SPD segmentation model
+ //
+ void LoadClusterArrays(TTree* tree, TTree* treeMix=0);
+ void LoadClusterArrays(TTree* tree,int il);
- void LoadClusterArrays(TTree* tree);
-
- ClassDef(AliITSMultReconstructor,3)
+ ClassDef(AliITSMultReconstructor,11)
};
+//____________________________________________________________________
+inline void AliITSMultReconstructor::ClusterPos2Angles(Float_t *clPar, const Float_t *vtx) const
+{
+ // convert cluster coordinates to angles wrt vertex
+ 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);
+ clPar[kClTh] = TMath::ACos(z/r); // Store Theta
+ clPar[kClPh] = TMath::Pi() + TMath::ATan2(-y,-x); // Store Phi
+ //
+}
+
+//____________________________________________________________________
+inline Double_t AliITSMultReconstructor::CalcDist(Double_t dphi, Double_t dtheta, Double_t theta) const
+{
+ // calculate eliptical distance. theta is the angle of cl1, dtheta = tht(cl1)-tht(cl2)
+ dphi = TMath::Abs(dphi) - fDPhiShift;
+ if (fScaleDTBySin2T) {
+ double sinTI = TMath::Sin(theta-dtheta/2);
+ sinTI *= sinTI;
+ dtheta /= sinTI>1.e-6 ? sinTI : 1.e-6;
+ }
+ return dphi*dphi/fDPhiWindow2 + dtheta*dtheta/fDThetaWindow2;
+}
+
+//____________________________________________________________________
+inline void AliITSMultReconstructor::CalcThetaPhi(float x, float y,float z,float &theta,float &phi) const
+{
+ // get theta and phi in tracklet convention
+ theta = TMath::ACos(z/TMath::Sqrt(x*x + y*y + z*z));
+ phi = TMath::Pi() + TMath::ATan2(-y,-x);
+}
+
+
#endif
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