1 #ifndef ALIITSTRACKERSA_H
2 #define ALIITSTRACKERSA_H
6 #include "AliITSgeomTGeo.h"
7 #include "AliITStrackerMI.h"
9 /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
10 * See cxx source for full Copyright notice */
12 ////////////////////////////////////////////////////
13 // Stand alone tracker class //
14 // Origin: Elisabetta Crescio //
15 // e-mail: crescio@to.infn.it //
16 // adapted for cosmics by A.Dainese //
17 ////////////////////////////////////////////////////
19 class AliITSclusterTable;
27 class AliITStrackerSA : public AliITStrackerMI {
33 AliITStrackerSA(const Char_t *geom);
34 AliITStrackerSA(const Char_t *geom,AliESDVertex *vert);
35 AliITStrackerSA(const Char_t *geom,AliITSVertexer *vertexer);
36 AliITStrackerSA(const AliITStrackerSA& tracker);
37 AliITStrackerSA& operator=(const AliITStrackerSA& source);
38 virtual ~AliITStrackerSA();
39 virtual Int_t Clusters2Tracks(AliESDEvent *event);
40 Int_t FindTracks(AliESDEvent* event);
42 AliITStrackV2* FitTrack(AliITStrackSA* tr,Double_t* primaryVertex);
43 AliITStrackV2* FitShortTrack(AliITStrackSA* tr,Double_t *primaryVertex,
45 AliITStrackV2* FitJumpyTrack(AliITStrackSA* tr,Double_t *primaryVertex);
46 Int_t FindTrackLowChiSquare(TObjArray* tracklist, Int_t dim) const;
47 Int_t LoadClusters(TTree *cf) {Int_t rc=AliITStrackerMI::LoadClusters(cf); SetClusterTree(cf); SetSixPoints(kTRUE); return rc;}
48 void SetVertex(AliESDVertex *vtx){fVert = vtx;}
49 void SetClusterTree(TTree * itscl){fITSclusters = itscl;}
50 void SetSixPoints(Bool_t sp = kFALSE){fSixPoints = sp;}
51 Bool_t GetSixPoints() const {return fSixPoints;}
52 void SetOuterStartLayer(Int_t osl = 0) {if(osl>(AliITSgeomTGeo::GetNLayers()-2)) osl=AliITSgeomTGeo::GetNLayers()-2; fOuterStartLayer = osl;}
53 Int_t GetOuterStartLayer() const {return fOuterStartLayer;}
54 void SetSAFlag(Bool_t fl){fITSStandAlone=fl;} // StandAlone flag setter
55 Bool_t GetSAFlag() const {return fITSStandAlone;} // StandAlone flag getter
56 void SetWindowSizes(Int_t n=46, Double_t *phi=0, Double_t *lam=0);
58 enum {kSAflag=0x8000}; //flag to mark clusters used in the SA tracker
64 void ResetForFinding();
67 static Double_t Curvature(Double_t x1,Double_t y1,Double_t x2,Double_t y2,
68 Double_t x3,Double_t y3);
70 Double_t ChoosePoint(Double_t p1, Double_t p2, Double_t pp);
72 static Int_t FindIntersection(Float_t a1, Float_t b1, Float_t c1, Float_t c2,
73 Float_t& x1,Float_t& y1, Float_t& x2, Float_t& y2);
74 static Int_t FindEquation(Float_t x1, Float_t y1, Float_t x2, Float_t y2,
75 Float_t x3, Float_t y3,Float_t& a, Float_t& b,
78 static Int_t FindLabel(Int_t l1, Int_t l2, Int_t l3, Int_t l4, Int_t l5, Int_t l6);
79 static Int_t Label(Int_t gl1, Int_t gl2, Int_t gl3, Int_t gl4, Int_t gl5,
80 Int_t gl6,Int_t gl7, Int_t gl8, Int_t gl9, Int_t gl10,Int_t gl11,
81 Int_t gl12, Int_t gl13, Int_t gl14,Int_t gl15, Int_t gl16,
82 Int_t gl17, Int_t gl18, Int_t numberofpoints=6);
84 Int_t SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow,
85 AliITStrackSA* trs,Double_t zvertex,Int_t flagp);
87 void GetCoorAngles(AliITSRecPoint* cl,Double_t &phi,Double_t &lambda,Float_t &x,Float_t &y,Float_t &z,Double_t* vertex);
88 void GetCoorErrors(AliITSRecPoint* cl,Float_t &sx,Float_t &sy, Float_t &sz);
90 AliITSclusterTable* GetClusterCoord(Int_t layer,Int_t n) const {return (AliITSclusterTable*)fCluCoord[layer]->UncheckedAt(n);}
91 void RemoveClusterCoord(Int_t layer, Int_t n) {fCluCoord[layer]->RemoveAt(n);fCluCoord[layer]->Compress();}
94 Double_t fPhiEstimate; //Estimation of phi angle on next layer
95 Bool_t fITSStandAlone; //Tracking is performed in the ITS alone if kTRUE
96 Float_t fPoint1[2]; //! coord. of 1-st point to evaluate the curvature
97 Float_t fPoint2[2]; //! coord. of 2-nd point to evaluate the curvature
98 Float_t fPoint3[2]; //! coord. of 3-rd point to evaluate the curvature
99 Float_t fPointc[2]; //! current point coord (for curvature eval.)
100 Double_t fLambdac; //! current value of the Lambda angle in the window
101 Double_t fPhic; //! current value of the Phi angle in the window
102 Float_t fCoef1; //! param. of the equation of the circ. approx a layer
103 Float_t fCoef2; //! param. of the equation of the circ. approx a layer
104 Float_t fCoef3; //! param. of the equation of the circ. approx a layer
105 Int_t fNloop; // Number of iterqations on phi and lambda windows
106 Double_t *fPhiWin; // phi window sizes
107 Double_t *fLambdaWin; // lambda window sizes
108 AliESDVertex *fVert; //! primary vertex
109 AliITSVertexer *fVertexer; //! vertexer
110 TObjArray *fListOfTracks; //! container for found tracks
111 TTree *fITSclusters; //! pointer to ITS tree of clusters
112 Bool_t fSixPoints; // If true 6/6 points are required (default). 5/6 otherwise
113 Int_t fOuterStartLayer; // Search for tracks with <6 points: outer layer to start from
115 TClonesArray** fCluLayer; //! array with clusters
116 TClonesArray** fCluCoord; //! array with cluster info
118 ClassDef(AliITStrackerSA,6)