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73042f01 | 1 | #ifndef ALITPCTRACK_H |
2 | #define ALITPCTRACK_H | |
3 | /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
4 | * See cxx source for full Copyright notice */ | |
5 | ||
73042f01 | 6 | //------------------------------------------------------- |
7 | // TPC Track Class | |
8 | // | |
9 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
10 | //------------------------------------------------------- | |
11 | ||
be9c5115 | 12 | /***************************************************************************** |
13 | * December 18, 2000 * | |
14 | * Internal view of the TPC track parametrisation as well as the order of * | |
15 | * track parameters are subject for possible changes ! * | |
16 | * Use GetExternalParameters() and GetExternalCovariance() to access TPC * | |
17 | * track information regardless of its internal representation. * | |
18 | * This formation is now fixed in the following way: * | |
19 | * external param0: local Y-coordinate of a track (cm) * | |
20 | * external param1: local Z-coordinate of a track (cm) * | |
21 | * external param2: local sine of the track momentum azimuth angle * | |
22 | * external param3: tangent of the track momentum dip angle * | |
23 | * external param4: 1/pt (1/(GeV/c)) * | |
24 | *****************************************************************************/ | |
25 | ||
b19a0509 | 26 | #include <AliKalmanTrack.h> |
73042f01 | 27 | #include <TMath.h> |
73042f01 | 28 | |
b9de75e1 | 29 | #include "AliTPCreco.h" |
30 | ||
73042f01 | 31 | class AliTPCClustersArray; |
32 | class AliTPCcluster; | |
33 | ||
34 | //_____________________________________________________________________________ | |
b19a0509 | 35 | class AliTPCtrack : public AliKalmanTrack { |
73042f01 | 36 | public: |
b19a0509 | 37 | AliTPCtrack():AliKalmanTrack(){} |
38 | AliTPCtrack(UInt_t index, const Double_t xx[5], | |
39 | const Double_t cc[15], Double_t xr, Double_t alpha); | |
b9de75e1 | 40 | AliTPCtrack(const AliKalmanTrack& t, Double_t alpha); |
b19a0509 | 41 | AliTPCtrack(const AliTPCtrack& t); |
7f6ddf58 | 42 | Int_t PropagateToVertex(Double_t x0=36.66,Double_t rho=1.2e-3); |
b19a0509 | 43 | Int_t Rotate(Double_t angle); |
7f6ddf58 | 44 | void SetdEdx(Double_t dedx) {fdEdx=dedx;} |
b19a0509 | 45 | |
be9c5115 | 46 | Double_t GetX() const {return fX;} |
47 | Double_t GetAlpha() const {return fAlpha;} | |
48 | Double_t GetdEdx() const {return fdEdx;} | |
49 | ||
b19a0509 | 50 | Double_t GetY() const {return fP0;} |
51 | Double_t GetZ() const {return fP1;} | |
b9de75e1 | 52 | Double_t GetSnp() const {return fX*fP4 - fP2;} |
53 | Double_t Get1Pt() const {return fP4*GetConvConst();} | |
54 | Double_t GetTgl() const {return fP3;} | |
be9c5115 | 55 | |
b19a0509 | 56 | Double_t GetSigmaY2() const {return fC00;} |
57 | Double_t GetSigmaZ2() const {return fC11;} | |
be9c5115 | 58 | |
59 | Int_t Compare(const TObject *o) const; | |
60 | ||
61 | void GetExternalParameters(Double_t& xr, Double_t x[5]) const ; | |
62 | void GetExternalCovariance(Double_t cov[15]) const ; | |
63 | ||
b9de75e1 | 64 | Int_t GetClusterIndex(Int_t i) const {return fIndex[i];} |
65 | ||
be9c5115 | 66 | //******** To be removed next release !!! ************** |
67 | Double_t GetEta() const {return fP2;} | |
b9de75e1 | 68 | Double_t GetC() const {return fP4;} |
be9c5115 | 69 | void GetCovariance(Double_t cc[15]) const { |
70 | cc[0 ]=fC00; | |
71 | cc[1 ]=fC10; cc[2 ]=fC11; | |
72 | cc[3 ]=fC20; cc[4 ]=fC21; cc[5 ]=fC22; | |
b9de75e1 | 73 | cc[6 ]=fC40; cc[7 ]=fC41; cc[8 ]=fC42; cc[9 ]=fC44; |
74 | cc[10]=fC30; cc[11]=fC31; cc[12]=fC32; cc[13]=fC43; cc[14]=fC33; | |
be9c5115 | 75 | } |
76 | //****************************************************** | |
77 | ||
be9c5115 | 78 | virtual Double_t GetPredictedChi2(const AliCluster *cluster) const; |
7f6ddf58 | 79 | Int_t PropagateTo(Double_t xr,Double_t x0=28.94,Double_t rho=0.9e-3); |
be9c5115 | 80 | Int_t Update(const AliCluster* c, Double_t chi2, UInt_t i); |
b9de75e1 | 81 | void ResetCovariance(); |
73042f01 | 82 | |
be9c5115 | 83 | private: |
84 | Double_t fX; // X-coordinate of this track (reference plane) | |
85 | Double_t fAlpha; // Rotation angle the local (TPC sector) | |
86 | // coordinate system and the global ALICE one. | |
73042f01 | 87 | |
7f6ddf58 | 88 | Double_t fdEdx; // dE/dx |
73042f01 | 89 | |
be9c5115 | 90 | Double_t fP0; // Y-coordinate of a track |
91 | Double_t fP1; // Z-coordinate of a track | |
92 | Double_t fP2; // C*x0 | |
b9de75e1 | 93 | Double_t fP3; // tangent of the track momentum dip angle |
94 | Double_t fP4; // track curvature | |
be9c5115 | 95 | |
96 | Double_t fC00; // covariance | |
97 | Double_t fC10, fC11; // matrix | |
98 | Double_t fC20, fC21, fC22; // of the | |
99 | Double_t fC30, fC31, fC32, fC33; // track | |
100 | Double_t fC40, fC41, fC42, fC43, fC44; // parameters | |
101 | ||
b9de75e1 | 102 | UInt_t fIndex[kMaxRow]; // indices of associated clusters |
73042f01 | 103 | |
b19a0509 | 104 | ClassDef(AliTPCtrack,1) // Time Projection Chamber reconstructed tracks |
73042f01 | 105 | }; |
106 | ||
be9c5115 | 107 | inline |
108 | void AliTPCtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const { | |
109 | //--------------------------------------------------------------------- | |
110 | // This function return external TPC track representation | |
111 | //--------------------------------------------------------------------- | |
112 | xr=fX; | |
113 | x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt(); | |
114 | } | |
115 | ||
73042f01 | 116 | #endif |
117 | ||
118 |