4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
7 #include <AliKalmanTrack.h>
10 #include "AliTRDgeometry.h"
17 const unsigned kMAX_CLUSTERS_PER_TRACK=210;
19 class AliTRDtrack : public AliKalmanTrack {
21 // Represents reconstructed TRD track
25 AliTRDtrack():AliKalmanTrack(){fBackupTrack=0;}
26 AliTRDtrack(const AliTRDcluster *c, UInt_t index, const Double_t xx[5],
27 const Double_t cc[15], Double_t xr, Double_t alpha);
28 AliTRDtrack(const AliTRDtrack& t);
29 AliTRDtrack(const AliKalmanTrack& t, Double_t alpha);
30 AliTRDtrack(const AliESDtrack& t);
32 Int_t Compare(const TObject *o) const;
33 void CookdEdx(Double_t low=0.05, Double_t up=0.70);
35 Double_t GetAlpha() const {return fAlpha;}
36 Int_t GetSector() const {
37 //if (fabs(fAlpha) < AliTRDgeometry::GetAlpha()/2) return 0;
38 return Int_t(TVector2::Phi_0_2pi(fAlpha)/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;}
40 Double_t GetC() const {return fC;}
41 Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
42 Float_t GetClusterdQdl(Int_t i) const {return fdQdl[i];}
44 void GetCovariance(Double_t cov[15]) const;
45 Double_t GetdEdx() const {return fdEdx;}
46 Double_t GetPIDsignal() const {return GetdEdx();}
47 Float_t GetPIDsignals(Int_t i) const {return fdEdxPlane[i];}
48 Int_t GetPIDTimBin(Int_t i) const {return fTimBinPlane[i];}
49 Double_t GetEta() const {return fE;}
51 void GetExternalCovariance(Double_t cov[15]) const ;
52 void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
54 Double_t GetLikelihoodElectron() const { return fLhElectron; };
56 Double_t Get1Pt() const {return (1e-9*TMath::Abs(fC)/fC + fC)*GetConvConst(); }
57 Double_t GetP() const {
58 return TMath::Abs(GetPt())*sqrt(1.+GetTgl()*GetTgl());
60 Double_t GetPredictedChi2(const AliTRDcluster*, Double_t h01) const ;
61 Double_t GetPt() const {return 1./Get1Pt();}
62 void GetPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const ;
63 void GetGlobalXYZ(Double_t &x, Double_t &y, Double_t &z) const ;
64 Int_t GetSeedLabel() const { return fSeedLab; }
65 Double_t GetSigmaC2() const {return fCcc;}
66 Double_t GetSigmaTgl2() const {return fCtt;}
67 Double_t GetSigmaY2() const {return fCyy;}
68 Double_t GetSigmaZ2() const {return fCzz;}
69 Double_t GetSnp() const {return fX*fC - fE;}
70 Double_t GetTgl() const {return fT;}
71 Double_t GetX() const {return fX;}
72 Double_t GetY() const {return fY;}
73 Double_t GetZ() const {return fZ;}
74 UInt_t * GetBackupIndexes() {return fIndexBackup;}
75 UInt_t * GetIndexes() {return fIndex;}
78 Double_t GetYat(Double_t xk) const {
79 //-----------------------------------------------------------------
80 // This function calculates the Y-coordinate of a track at the plane x=xk.
81 // Needed for matching with the TOF (I.Belikov)
82 //-----------------------------------------------------------------
83 Double_t c1=fC*fX - fE, r1=TMath::Sqrt(1.- c1*c1);
84 Double_t c2=fC*xk - fE, r2=TMath::Sqrt(1.- c2*c2);
85 return fY + (xk-fX)*(c1+c2)/(r1+r2);
87 void SetStop(Bool_t stop) {fStopped=stop;}
88 Bool_t GetStop() const {return fStopped;}
90 Int_t PropagateTo(Double_t xr, Double_t x0=8.72, Double_t rho=5.86e-3);
91 void ResetCovariance();
92 void ResetCovariance(Float_t mult);
93 void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
94 Int_t Rotate(Double_t angle);
96 void SetdEdx(Float_t dedx) {fdEdx=dedx;}
97 void SetPIDsignals(Float_t dedx, Int_t i) {fdEdxPlane[i]=dedx;}
98 void SetPIDTimBin(Int_t timbin, Int_t i) {fTimBinPlane[i]=timbin;}
99 void SetLikelihoodElectron(Float_t l) { fLhElectron = l; };
101 void SetSampledEdx(Float_t q, Int_t i) {
102 Double_t s=GetSnp(), t=GetTgl();
103 q*= TMath::Sqrt((1-s*s)/(1+t*t));
107 void SetSeedLabel(Int_t lab) { fSeedLab=lab; }
109 Int_t Update(const AliTRDcluster* c, Double_t chi2, UInt_t i,
111 Int_t UpdateMI(const AliTRDcluster* c, Double_t chi2, UInt_t i,
112 Double_t h01, Int_t plane);
115 void AddNWrong() {fNWrong++;}
117 Int_t GetNWrong() const {return fNWrong;}
118 Int_t GetNRotate() const {return fNRotate;}
119 Int_t GetNCross() const {return fNCross;}
120 void IncCross() {fNCross++;}
121 AliTRDtrack * GetBackupTrack(){return fBackupTrack;}
122 void MakeBackupTrack();
128 Int_t fSeedLab; // track label taken from seeding
129 Float_t fdEdx; // dE/dx
130 Float_t fdEdxPlane[kNPlane]; // dE/dx from all 6 planes
131 Int_t fTimBinPlane[kNPlane]; // time bin of Max cluster from all 6 planes
133 Double_t fAlpha; // rotation angle
134 Double_t fX; // running local X-coordinate of the track (time bin)
135 Bool_t fStopped; // track stop indication
137 Double_t fY; // Y-coordinate of the track
138 Double_t fZ; // Z-coordinate of the track
140 Double_t fT; // tangent of the track momentum dip angle
141 Double_t fC; // track curvature
143 Double_t fCyy; // covariance
144 Double_t fCzy, fCzz; // matrix
145 Double_t fCey, fCez, fCee; // of the
146 Double_t fCty, fCtz, fCte, fCtt; // track
147 Double_t fCcy, fCcz, fCce, fCct, fCcc; // parameters
149 UInt_t fIndex[kMAX_CLUSTERS_PER_TRACK]; // global indexes of clusters
150 UInt_t fIndexBackup[kMAX_CLUSTERS_PER_TRACK]; //backup indexes of clusters - used in iterations
151 Float_t fdQdl[kMAX_CLUSTERS_PER_TRACK]; // cluster amplitudes corrected
154 Float_t fLhElectron; // Likelihood to be an electron
155 Int_t fNWrong; // number of wrong clusters
156 Int_t fNRotate; // number of rotation
157 Int_t fNCross; // number of the cross materials
158 AliTRDtrack * fBackupTrack; //! backup track
159 ClassDef(AliTRDtrack,2) // TRD reconstructed tracks