]>
Commit | Line | Data |
---|---|---|
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 */ | |
0938c7d3 | 5 | /* $Id$ */ |
6 | ||
73042f01 | 7 | //------------------------------------------------------- |
8 | // TPC Track Class | |
9 | // | |
10 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
11 | //------------------------------------------------------- | |
12 | ||
be9c5115 | 13 | /***************************************************************************** |
14 | * December 18, 2000 * | |
15 | * Internal view of the TPC track parametrisation as well as the order of * | |
16 | * track parameters are subject for possible changes ! * | |
17 | * Use GetExternalParameters() and GetExternalCovariance() to access TPC * | |
18 | * track information regardless of its internal representation. * | |
19 | * This formation is now fixed in the following way: * | |
20 | * external param0: local Y-coordinate of a track (cm) * | |
21 | * external param1: local Z-coordinate of a track (cm) * | |
22 | * external param2: local sine of the track momentum azimuth angle * | |
23 | * external param3: tangent of the track momentum dip angle * | |
24 | * external param4: 1/pt (1/(GeV/c)) * | |
25 | *****************************************************************************/ | |
b19a0509 | 26 | #include <AliKalmanTrack.h> |
73042f01 | 27 | #include <TMath.h> |
73042f01 | 28 | |
b9de75e1 | 29 | #include "AliTPCreco.h" |
30 | ||
9c9d2487 | 31 | class AliBarrelTrack; |
83d73500 | 32 | class AliESDtrack; |
9c9d2487 | 33 | |
73042f01 | 34 | //_____________________________________________________________________________ |
b19a0509 | 35 | class AliTPCtrack : public AliKalmanTrack { |
73042f01 | 36 | public: |
9c8948ff | 37 | AliTPCtrack(); |
b19a0509 | 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); |
83d73500 | 41 | AliTPCtrack(const AliESDtrack& t); |
b19a0509 | 42 | AliTPCtrack(const AliTPCtrack& t); |
7c27857f | 43 | virtual ~AliTPCtrack() {} |
7f6ddf58 | 44 | Int_t PropagateToVertex(Double_t x0=36.66,Double_t rho=1.2e-3); |
2ee21e83 | 45 | Int_t PropagateToPrimVertex(Double_t x0,Double_t rho){return PropagateToVertex(x0,rho);} |
b19a0509 | 46 | Int_t Rotate(Double_t angle); |
7f6ddf58 | 47 | void SetdEdx(Double_t dedx) {fdEdx=dedx;} |
b19a0509 | 48 | |
c630aafd | 49 | Double_t GetYat(Double_t x) const ; |
be9c5115 | 50 | Double_t GetX() const {return fX;} |
51 | Double_t GetAlpha() const {return fAlpha;} | |
52 | Double_t GetdEdx() const {return fdEdx;} | |
83d73500 | 53 | Double_t GetPIDsignal() const {return GetdEdx();} |
be9c5115 | 54 | |
b19a0509 | 55 | Double_t GetY() const {return fP0;} |
56 | Double_t GetZ() const {return fP1;} | |
83d73500 | 57 | Double_t GetSnp() const {return fX*fP4 - fP2;} |
024a7fe9 | 58 | Double_t |
59 | Get1Pt() const { return (1e-9*TMath::Abs(fP4)/fP4 + fP4)*GetConvConst(); } | |
b9de75e1 | 60 | Double_t GetTgl() const {return fP3;} |
be9c5115 | 61 | |
b19a0509 | 62 | Double_t GetSigmaY2() const {return fC00;} |
63 | Double_t GetSigmaZ2() const {return fC11;} | |
be9c5115 | 64 | |
77e58468 | 65 | // Some methods useful for users. Implementation is not |
66 | // optimized for speed but for minimal maintanance effort | |
67 | Double_t Phi() const; | |
68 | Double_t Theta() const {return TMath::Pi()/2.-TMath::ATan(GetTgl());} | |
69 | Double_t Px() const {return TMath::Cos(Phi())/TMath::Abs(Get1Pt());} | |
70 | Double_t Py() const {return TMath::Sin(Phi())/TMath::Abs(Get1Pt());} | |
71 | Double_t Pz() const {return GetTgl()/TMath::Abs(Get1Pt());} | |
c5507f6d | 72 | Double_t Pt() const {return 1./TMath::Abs(Get1Pt());} |
77e58468 | 73 | Double_t P() const {return TMath::Sqrt(Pt()*Pt()+Pz()*Pz());} |
74 | ||
be9c5115 | 75 | Int_t Compare(const TObject *o) const; |
76 | ||
77 | void GetExternalParameters(Double_t& xr, Double_t x[5]) const ; | |
78 | void GetExternalCovariance(Double_t cov[15]) const ; | |
79 | ||
9c9d2487 | 80 | // [SR, 01.04.2003] |
81 | ||
82 | void GetBarrelTrack(AliBarrelTrack *track); | |
83 | ||
84 | void ResetNWrong() {fNWrong = 0;} | |
85 | void ResetNRotation() {fNRotation = 0;} | |
86 | ||
87 | Int_t GetNWrong() const {return fNWrong;} | |
88 | Int_t GetNRotation() const {return fNRotation;} | |
89 | ||
90 | Int_t GetNumber() const {return fNumber;} | |
91 | void SetNumber(Int_t n) {fNumber = n;} | |
92 | // | |
93 | ||
b9de75e1 | 94 | Int_t GetClusterIndex(Int_t i) const {return fIndex[i];} |
95 | ||
be9c5115 | 96 | //******** To be removed next release !!! ************** |
97 | Double_t GetEta() const {return fP2;} | |
b9de75e1 | 98 | Double_t GetC() const {return fP4;} |
be9c5115 | 99 | void GetCovariance(Double_t cc[15]) const { |
100 | cc[0 ]=fC00; | |
101 | cc[1 ]=fC10; cc[2 ]=fC11; | |
102 | cc[3 ]=fC20; cc[4 ]=fC21; cc[5 ]=fC22; | |
b9de75e1 | 103 | cc[6 ]=fC40; cc[7 ]=fC41; cc[8 ]=fC42; cc[9 ]=fC44; |
104 | cc[10]=fC30; cc[11]=fC31; cc[12]=fC32; cc[13]=fC43; cc[14]=fC33; | |
83d73500 | 105 | } |
be9c5115 | 106 | //****************************************************** |
107 | ||
be9c5115 | 108 | virtual Double_t GetPredictedChi2(const AliCluster *cluster) const; |
7f6ddf58 | 109 | Int_t PropagateTo(Double_t xr,Double_t x0=28.94,Double_t rho=0.9e-3); |
be9c5115 | 110 | Int_t Update(const AliCluster* c, Double_t chi2, UInt_t i); |
b9de75e1 | 111 | void ResetCovariance(); |
73042f01 | 112 | |
1c53abe2 | 113 | protected: |
be9c5115 | 114 | Double_t fX; // X-coordinate of this track (reference plane) |
115 | Double_t fAlpha; // Rotation angle the local (TPC sector) | |
116 | // coordinate system and the global ALICE one. | |
73042f01 | 117 | |
7f6ddf58 | 118 | Double_t fdEdx; // dE/dx |
73042f01 | 119 | |
be9c5115 | 120 | Double_t fP0; // Y-coordinate of a track |
121 | Double_t fP1; // Z-coordinate of a track | |
122 | Double_t fP2; // C*x0 | |
b9de75e1 | 123 | Double_t fP3; // tangent of the track momentum dip angle |
124 | Double_t fP4; // track curvature | |
be9c5115 | 125 | |
126 | Double_t fC00; // covariance | |
127 | Double_t fC10, fC11; // matrix | |
128 | Double_t fC20, fC21, fC22; // of the | |
129 | Double_t fC30, fC31, fC32, fC33; // track | |
130 | Double_t fC40, fC41, fC42, fC43, fC44; // parameters | |
83d73500 | 131 | |
b9de75e1 | 132 | UInt_t fIndex[kMaxRow]; // indices of associated clusters |
73042f01 | 133 | |
9c9d2487 | 134 | //[SR, 01.04.2003] |
135 | Int_t fNWrong; // number of wrong clusters | |
136 | Int_t fNRotation; // number of rotations | |
137 | Int_t fNumber; // magic number used for number of clusters | |
138 | ||
b19a0509 | 139 | ClassDef(AliTPCtrack,1) // Time Projection Chamber reconstructed tracks |
73042f01 | 140 | }; |
141 | ||
be9c5115 | 142 | inline |
143 | void AliTPCtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const { | |
144 | //--------------------------------------------------------------------- | |
145 | // This function return external TPC track representation | |
146 | //--------------------------------------------------------------------- | |
83d73500 | 147 | xr=fX; |
be9c5115 | 148 | x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt(); |
149 | } | |
150 | ||
73042f01 | 151 | #endif |
152 |