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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 */ | |
0938c7d3 | 5 | /* $Id$ */ |
6 | ||
73042f01 | 7 | //------------------------------------------------------- |
8 | // TPC Track Class | |
9 | // | |
10 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
2fc0c115 | 11 | // |
12 | // December 18, 2000 | |
13 | // Internal view of the TPC track parametrisation as well as the order of | |
14 | // track parameters are subject for possible changes ! | |
15 | // Use GetExternalParameters() and GetExternalCovariance() to access TPC | |
16 | // track information regardless of its internal representation. | |
17 | // This formation is now fixed in the following way: | |
18 | // external param0: local Y-coordinate of a track (cm) | |
19 | // external param1: local Z-coordinate of a track (cm) | |
20 | // external param2: local sine of the track momentum azimuth angle | |
21 | // external param3: tangent of the track momentum dip angle | |
22 | // external param4: 1/pt (1/(GeV/c)) | |
23 | // | |
b19a0509 | 24 | #include <AliKalmanTrack.h> |
73042f01 | 25 | #include <TMath.h> |
73042f01 | 26 | |
b9de75e1 | 27 | #include "AliTPCreco.h" |
51ad6848 | 28 | #include "AliExternalTrackParam.h" |
83d73500 | 29 | class AliESDtrack; |
9c9d2487 | 30 | |
73042f01 | 31 | //_____________________________________________________________________________ |
b19a0509 | 32 | class AliTPCtrack : public AliKalmanTrack { |
73042f01 | 33 | public: |
9c8948ff | 34 | AliTPCtrack(); |
b19a0509 | 35 | AliTPCtrack(UInt_t index, const Double_t xx[5], |
36 | const Double_t cc[15], Double_t xr, Double_t alpha); | |
83d73500 | 37 | AliTPCtrack(const AliESDtrack& t); |
b19a0509 | 38 | AliTPCtrack(const AliTPCtrack& t); |
7c27857f | 39 | virtual ~AliTPCtrack() {} |
7f6ddf58 | 40 | Int_t PropagateToVertex(Double_t x0=36.66,Double_t rho=1.2e-3); |
b19a0509 | 41 | Int_t Rotate(Double_t angle); |
7f6ddf58 | 42 | void SetdEdx(Double_t dedx) {fdEdx=dedx;} |
b19a0509 | 43 | |
c630aafd | 44 | Double_t GetYat(Double_t x) const ; |
be9c5115 | 45 | Double_t GetX() const {return fX;} |
46 | Double_t GetAlpha() const {return fAlpha;} | |
47 | Double_t GetdEdx() const {return fdEdx;} | |
83d73500 | 48 | Double_t GetPIDsignal() const {return GetdEdx();} |
be9c5115 | 49 | |
b19a0509 | 50 | Double_t GetY() const {return fP0;} |
51 | Double_t GetZ() const {return fP1;} | |
83d73500 | 52 | Double_t GetSnp() const {return fX*fP4 - fP2;} |
024a7fe9 | 53 | Double_t |
54 | Get1Pt() const { return (1e-9*TMath::Abs(fP4)/fP4 + fP4)*GetConvConst(); } | |
b9de75e1 | 55 | Double_t GetTgl() const {return fP3;} |
be9c5115 | 56 | |
b19a0509 | 57 | Double_t GetSigmaY2() const {return fC00;} |
58 | Double_t GetSigmaZ2() const {return fC11;} | |
be9c5115 | 59 | |
77e58468 | 60 | // Some methods useful for users. Implementation is not |
61 | // optimized for speed but for minimal maintanance effort | |
62 | Double_t Phi() const; | |
63 | Double_t Theta() const {return TMath::Pi()/2.-TMath::ATan(GetTgl());} | |
64 | Double_t Px() const {return TMath::Cos(Phi())/TMath::Abs(Get1Pt());} | |
65 | Double_t Py() const {return TMath::Sin(Phi())/TMath::Abs(Get1Pt());} | |
66 | Double_t Pz() const {return GetTgl()/TMath::Abs(Get1Pt());} | |
c5507f6d | 67 | Double_t Pt() const {return 1./TMath::Abs(Get1Pt());} |
77e58468 | 68 | Double_t P() const {return TMath::Sqrt(Pt()*Pt()+Pz()*Pz());} |
69 | ||
be9c5115 | 70 | Int_t Compare(const TObject *o) const; |
71 | ||
72 | void GetExternalParameters(Double_t& xr, Double_t x[5]) const ; | |
73 | void GetExternalCovariance(Double_t cov[15]) const ; | |
74 | ||
9c9d2487 | 75 | // [SR, 01.04.2003] |
9c9d2487 | 76 | Int_t GetNumber() const {return fNumber;} |
77 | void SetNumber(Int_t n) {fNumber = n;} | |
78 | // | |
79 | ||
b9de75e1 | 80 | Int_t GetClusterIndex(Int_t i) const {return fIndex[i];} |
81 | ||
be9c5115 | 82 | //******** To be removed next release !!! ************** |
83 | Double_t GetEta() const {return fP2;} | |
b9de75e1 | 84 | Double_t GetC() const {return fP4;} |
be9c5115 | 85 | void GetCovariance(Double_t cc[15]) const { |
86 | cc[0 ]=fC00; | |
87 | cc[1 ]=fC10; cc[2 ]=fC11; | |
88 | cc[3 ]=fC20; cc[4 ]=fC21; cc[5 ]=fC22; | |
b9de75e1 | 89 | cc[6 ]=fC40; cc[7 ]=fC41; cc[8 ]=fC42; cc[9 ]=fC44; |
90 | cc[10]=fC30; cc[11]=fC31; cc[12]=fC32; cc[13]=fC43; cc[14]=fC33; | |
83d73500 | 91 | } |
be9c5115 | 92 | //****************************************************** |
93 | ||
be9c5115 | 94 | virtual Double_t GetPredictedChi2(const AliCluster *cluster) const; |
7f6ddf58 | 95 | Int_t PropagateTo(Double_t xr,Double_t x0=28.94,Double_t rho=0.9e-3); |
be9c5115 | 96 | Int_t Update(const AliCluster* c, Double_t chi2, UInt_t i); |
b9de75e1 | 97 | void ResetCovariance(); |
a91e73bc | 98 | void ResetClusters() {SetNumberOfClusters(0); SetChi2(0.);} |
51ad6848 | 99 | void UpdatePoints();//update points |
100 | Float_t* GetPoints() {return fPoints;} | |
51584047 | 101 | // |
102 | // TClonesArray * fHelixIn; //array of helixes | |
103 | //TClonesArray * fHelixOut; //array of helixes | |
104 | // | |
105 | Float_t Density(Int_t row0, Int_t row1); //calculate cluster density | |
106 | Float_t Density2(Int_t row0, Int_t row1); //calculate cluster density | |
107 | Double_t GetZat0() const; | |
108 | Double_t GetD(Double_t x=0, Double_t y=0) const; | |
51ad6848 | 109 | AliExternalTrackParam & GetReference(){ return fReference;} |
110 | void UpdateReference(){ new (&fReference) AliExternalTrackParam(*this);} | |
111 | Int_t GetKinkIndex(Int_t i) const{ return fKinkIndexes[i];} | |
112 | Int_t* GetKinkIndexes() { return fKinkIndexes;} | |
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 | |
51584047 | 132 | Int_t fIndex[kMaxRow]; // indices of associated clusters |
51ad6848 | 133 | Float_t fPoints[4]; //first, max dens row end points of the track and max density |
9c9d2487 | 134 | //[SR, 01.04.2003] |
9c9d2487 | 135 | Int_t fNumber; // magic number used for number of clusters |
2fc0c115 | 136 | // MI addition |
137 | Float_t fSdEdx; // sigma of dedx | |
138 | // | |
139 | Int_t fNFoundable; //number of foundable clusters - dead zone taken to the account | |
140 | Bool_t fBConstrain; // indicate seeding with vertex constrain | |
141 | Int_t fLastPoint; // last cluster position | |
142 | Int_t fFirstPoint; // first cluster position | |
143 | Int_t fRemoval; // removal factor | |
144 | Int_t fTrackType; // track type - 0 - normal - 1 - kink - 2 -V0 3- double found | |
145 | Int_t fLab2; // index of corresponding track (kink, V0, double) | |
146 | Int_t fNShared; // number of shared points | |
51ad6848 | 147 | AliExternalTrackParam fReference; // track parameters at the middle of the chamber |
2fc0c115 | 148 | Float_t fKinkPoint[12]; //radius, of kink, dfi and dtheta |
51ad6848 | 149 | Int_t fKinkIndexes[3]; // kink indexes - minus = mother + daughter |
24de2d6d | 150 | |
151 | ClassDef(AliTPCtrack,2) // Time Projection Chamber reconstructed tracks | |
73042f01 | 152 | }; |
153 | ||
be9c5115 | 154 | inline |
155 | void AliTPCtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const { | |
be9c5115 | 156 | // This function return external TPC track representation |
83d73500 | 157 | xr=fX; |
be9c5115 | 158 | x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt(); |
159 | } | |
160 | ||
73042f01 | 161 | #endif |
162 |