1 #ifndef ALIITSMULTRECONSTRUCTOR_H
2 #define ALIITSMULTRECONSTRUCTOR_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
8 /////////////////////////////////////////////////////////////////////////
10 // AliITSMultReconstructor - find clusters in the pixels (theta and
11 // phi) and tracklets.
13 // These can be used to extract charged particles multiplcicity from the ITS.
15 // A tracklet consist of two ITS clusters, one in the first pixel
16 // layer and one in the second. The clusters are associates if the
17 // differencies in Phi (azimuth) and Zeta (longitudinal) are inside
18 // a fiducial volume. In case of multiple candidates it is selected the
19 // candidate with minimum distance in Phi.
20 // The boolean fOnlyOneTrackletPerC2 allows to control if two clusters
21 // in layer 2 can be associated to the same cluster in layer 1 or not.
23 /////////////////////////////////////////////////////////////////////////
33 class AliITSMultReconstructor : public TObject
36 AliITSMultReconstructor();
37 virtual ~AliITSMultReconstructor();
39 void SetGeometry(AliITSgeom* geo) {fGeometry = geo;}
41 void Reconstruct(TTree* tree, Float_t* vtx, Float_t* vtxRes);
43 void SetPhiWindow(Float_t w=0.08) {fPhiWindow=w;}
44 void SetZetaWindow(Float_t w=1.) {fZetaWindow=w;}
45 void SetOnlyOneTrackletPerC2(Bool_t b = kTRUE) {fOnlyOneTrackletPerC2 = b;}
47 Int_t GetNClustersLayer1() const {return fNClustersLay1;}
48 Int_t GetNClustersLayer2() const {return fNClustersLay2;}
49 Int_t GetNTracklets() const {return fNTracklets;}
50 Int_t GetNSingleClusters() const {return fNSingleCluster;}
52 Float_t* GetClusterLayer1(Int_t n) {return fClustersLay1[n];}
53 Float_t* GetClusterLayer2(Int_t n) {return fClustersLay2[n];}
54 Float_t* GetTracklet(Int_t n) {return fTracklets[n];}
55 Float_t* GetCluster(Int_t n) {return fSClusters[n];}
57 void SetHistOn(Bool_t b=kFALSE) {fHistOn=b;}
61 AliITSMultReconstructor(const AliITSMultReconstructor& mr);
62 AliITSMultReconstructor& operator=(const AliITSMultReconstructor& mr);
64 AliITSgeom* fGeometry; // ITS geometry
66 Float_t** fClustersLay1; // clusters in the 1st layer of ITS
67 Float_t** fClustersLay2; // clusters in the 2nd layer of ITS
68 Float_t** fTracklets; // tracklets
69 Float_t** fSClusters; // single clusters (unassociated)
70 Bool_t* fAssociationFlag; // flag for the associations
72 Int_t fNClustersLay1; // Number of clusters (Layer1)
73 Int_t fNClustersLay2; // Number of clusters (Layer2)
74 Int_t fNTracklets; // Number of tracklets
75 Int_t fNSingleCluster; // Number of unassociated clusters
77 Float_t fPhiWindow; // Search window in phi
78 Float_t fZetaWindow; // SEarch window in eta
80 Bool_t fOnlyOneTrackletPerC2; // only one tracklet per cluster in L. 2
82 Bool_t fHistOn; // Option to define and fill the histograms
85 TH1F* fhClustersDPhiAcc; // Phi2 - Phi1 for tracklets
86 TH1F* fhClustersDThetaAcc; // Theta2 - Theta1 for tracklets
87 TH1F* fhClustersDZetaAcc; // z2 - z1projected for tracklets
88 TH1F* fhClustersDPhiAll; // Phi2 - Phi1 all the combinations
89 TH1F* fhClustersDThetaAll; // Theta2 - Theta1 all the combinations
90 TH1F* fhClustersDZetaAll; // z2 - z1projected all the combinations
92 TH2F* fhDPhiVsDThetaAll; // 2D plot for all the combinations
93 TH2F* fhDPhiVsDThetaAcc; // same plot for tracklets
94 TH2F* fhDPhiVsDZetaAll; // 2d plot for all the combination
95 TH2F* fhDPhiVsDZetaAcc; // same plot for tracklets
97 TH1F* fhetaTracklets; // Pseudorapidity distr. for tracklets
98 TH1F* fhphiTracklets; // Azimuthal (Phi) distr. for tracklets
99 TH1F* fhetaClustersLay1; // Pseudorapidity distr. for Clusters L. 1
100 TH1F* fhphiClustersLay1; // Azimuthal (Phi) distr. for Clusters L. 1
103 void LoadClusterArrays(TTree* tree);
105 ClassDef(AliITSMultReconstructor,2)