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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 | ||
0938c7d3 | 6 | /* $Id$ */ |
7 | ||
8 | ||
9 | ||
73042f01 | 10 | //------------------------------------------------------- |
11 | // TPC Track Class | |
12 | // | |
13 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
14 | //------------------------------------------------------- | |
15 | ||
be9c5115 | 16 | /***************************************************************************** |
17 | * December 18, 2000 * | |
18 | * Internal view of the TPC track parametrisation as well as the order of * | |
19 | * track parameters are subject for possible changes ! * | |
20 | * Use GetExternalParameters() and GetExternalCovariance() to access TPC * | |
21 | * track information regardless of its internal representation. * | |
22 | * This formation is now fixed in the following way: * | |
23 | * external param0: local Y-coordinate of a track (cm) * | |
24 | * external param1: local Z-coordinate of a track (cm) * | |
25 | * external param2: local sine of the track momentum azimuth angle * | |
26 | * external param3: tangent of the track momentum dip angle * | |
27 | * external param4: 1/pt (1/(GeV/c)) * | |
28 | *****************************************************************************/ | |
29 | ||
b19a0509 | 30 | #include <AliKalmanTrack.h> |
73042f01 | 31 | #include <TMath.h> |
73042f01 | 32 | |
b9de75e1 | 33 | #include "AliTPCreco.h" |
34 | ||
73042f01 | 35 | class AliTPCClustersArray; |
36 | class AliTPCcluster; | |
37 | ||
38 | //_____________________________________________________________________________ | |
b19a0509 | 39 | class AliTPCtrack : public AliKalmanTrack { |
73042f01 | 40 | public: |
9c8948ff | 41 | AliTPCtrack(); |
b19a0509 | 42 | AliTPCtrack(UInt_t index, const Double_t xx[5], |
43 | const Double_t cc[15], Double_t xr, Double_t alpha); | |
b9de75e1 | 44 | AliTPCtrack(const AliKalmanTrack& t, Double_t alpha); |
b19a0509 | 45 | AliTPCtrack(const AliTPCtrack& t); |
7f6ddf58 | 46 | Int_t PropagateToVertex(Double_t x0=36.66,Double_t rho=1.2e-3); |
b19a0509 | 47 | Int_t Rotate(Double_t angle); |
7f6ddf58 | 48 | void SetdEdx(Double_t dedx) {fdEdx=dedx;} |
b19a0509 | 49 | |
be9c5115 | 50 | Double_t GetX() const {return fX;} |
51 | Double_t GetAlpha() const {return fAlpha;} | |
52 | Double_t GetdEdx() const {return fdEdx;} | |
53 | ||
b19a0509 | 54 | Double_t GetY() const {return fP0;} |
55 | Double_t GetZ() const {return fP1;} | |
b9de75e1 | 56 | Double_t GetSnp() const {return fX*fP4 - fP2;} |
024a7fe9 | 57 | Double_t |
58 | Get1Pt() const { return (1e-9*TMath::Abs(fP4)/fP4 + fP4)*GetConvConst(); } | |
b9de75e1 | 59 | Double_t GetTgl() const {return fP3;} |
be9c5115 | 60 | |
b19a0509 | 61 | Double_t GetSigmaY2() const {return fC00;} |
62 | Double_t GetSigmaZ2() const {return fC11;} | |
be9c5115 | 63 | |
77e58468 | 64 | // Some methods useful for users. Implementation is not |
65 | // optimized for speed but for minimal maintanance effort | |
66 | Double_t Phi() const; | |
67 | Double_t Theta() const {return TMath::Pi()/2.-TMath::ATan(GetTgl());} | |
68 | Double_t Px() const {return TMath::Cos(Phi())/TMath::Abs(Get1Pt());} | |
69 | Double_t Py() const {return TMath::Sin(Phi())/TMath::Abs(Get1Pt());} | |
70 | Double_t Pz() const {return GetTgl()/TMath::Abs(Get1Pt());} | |
71 | Double_t Pt() const {return 1./Get1Pt();} | |
72 | Double_t P() const {return TMath::Sqrt(Pt()*Pt()+Pz()*Pz());} | |
73 | ||
be9c5115 | 74 | Int_t Compare(const TObject *o) const; |
75 | ||
76 | void GetExternalParameters(Double_t& xr, Double_t x[5]) const ; | |
77 | void GetExternalCovariance(Double_t cov[15]) const ; | |
78 | ||
b9de75e1 | 79 | Int_t GetClusterIndex(Int_t i) const {return fIndex[i];} |
80 | ||
be9c5115 | 81 | //******** To be removed next release !!! ************** |
82 | Double_t GetEta() const {return fP2;} | |
b9de75e1 | 83 | Double_t GetC() const {return fP4;} |
be9c5115 | 84 | void GetCovariance(Double_t cc[15]) const { |
85 | cc[0 ]=fC00; | |
86 | cc[1 ]=fC10; cc[2 ]=fC11; | |
87 | cc[3 ]=fC20; cc[4 ]=fC21; cc[5 ]=fC22; | |
b9de75e1 | 88 | cc[6 ]=fC40; cc[7 ]=fC41; cc[8 ]=fC42; cc[9 ]=fC44; |
89 | cc[10]=fC30; cc[11]=fC31; cc[12]=fC32; cc[13]=fC43; cc[14]=fC33; | |
be9c5115 | 90 | } |
91 | //****************************************************** | |
92 | ||
be9c5115 | 93 | virtual Double_t GetPredictedChi2(const AliCluster *cluster) const; |
7f6ddf58 | 94 | Int_t PropagateTo(Double_t xr,Double_t x0=28.94,Double_t rho=0.9e-3); |
be9c5115 | 95 | Int_t Update(const AliCluster* c, Double_t chi2, UInt_t i); |
b9de75e1 | 96 | void ResetCovariance(); |
73042f01 | 97 | |
1c53abe2 | 98 | protected: |
be9c5115 | 99 | Double_t fX; // X-coordinate of this track (reference plane) |
100 | Double_t fAlpha; // Rotation angle the local (TPC sector) | |
101 | // coordinate system and the global ALICE one. | |
73042f01 | 102 | |
7f6ddf58 | 103 | Double_t fdEdx; // dE/dx |
73042f01 | 104 | |
be9c5115 | 105 | Double_t fP0; // Y-coordinate of a track |
106 | Double_t fP1; // Z-coordinate of a track | |
107 | Double_t fP2; // C*x0 | |
b9de75e1 | 108 | Double_t fP3; // tangent of the track momentum dip angle |
109 | Double_t fP4; // track curvature | |
be9c5115 | 110 | |
111 | Double_t fC00; // covariance | |
112 | Double_t fC10, fC11; // matrix | |
113 | Double_t fC20, fC21, fC22; // of the | |
114 | Double_t fC30, fC31, fC32, fC33; // track | |
115 | Double_t fC40, fC41, fC42, fC43, fC44; // parameters | |
116 | ||
b9de75e1 | 117 | UInt_t fIndex[kMaxRow]; // indices of associated clusters |
73042f01 | 118 | |
b19a0509 | 119 | ClassDef(AliTPCtrack,1) // Time Projection Chamber reconstructed tracks |
73042f01 | 120 | }; |
121 | ||
be9c5115 | 122 | inline |
123 | void AliTPCtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const { | |
124 | //--------------------------------------------------------------------- | |
125 | // This function return external TPC track representation | |
126 | //--------------------------------------------------------------------- | |
127 | xr=fX; | |
128 | x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt(); | |
129 | } | |
130 | ||
73042f01 | 131 | #endif |
132 | ||
133 |