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"
11 #include "AliESDtrack.h"
18 const unsigned kMAXCLUSTERSPERTRACK=210;
20 class AliTRDtrack : public AliKalmanTrack {
22 //////////////////////////////////////////////////////////////////
23 // Represents a reconstructed TRD track //
24 //////////////////////////////////////////////////////////////////
26 friend class AliTRDtracker;
30 AliTRDtrack():AliKalmanTrack(){fBackupTrack=0;}
31 AliTRDtrack(const AliTRDcluster *c, UInt_t index, const Double_t xx[5],
32 const Double_t cc[15], Double_t xr, Double_t alpha);
33 AliTRDtrack(const AliTRDtrack& t);
34 AliTRDtrack(const AliKalmanTrack& t, Double_t alpha);
35 AliTRDtrack(const AliESDtrack& t);
37 Int_t Compare(const TObject *o) const;
38 void CookdEdx(Double_t low=0.05, Double_t up=0.55);
39 Float_t StatusForTOF();
40 Double_t GetAlpha() const {return fAlpha;}
41 Int_t GetSector() const {
42 //if (fabs(fAlpha) < AliTRDgeometry::GetAlpha()/2) return 0;
43 return Int_t(TVector2::Phi_0_2pi(fAlpha)/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;}
45 Double_t GetC() const {return fC;}
46 Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
47 Float_t GetClusterdQdl(Int_t i) const {return fdQdl[i];}
49 void GetCovariance(Double_t cov[15]) const;
50 Double_t GetdEdx() const {return fdEdx;}
51 Double_t GetPIDsignal() const {return GetdEdx();}
52 Float_t GetPIDsignals(Int_t i) const {return fdEdxPlane[i];}
53 Int_t GetPIDTimBin(Int_t i) const {return fTimBinPlane[i];}
54 Double_t GetEta() const {return fE;}
56 void GetExternalCovariance(Double_t cov[15]) const ;
57 void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
59 Double_t GetLikelihoodElectron() const { return fLhElectron; };
61 Double_t Get1Pt() const {return (1e-9*TMath::Abs(fC)/fC + fC)*GetConvConst(); }
62 Double_t GetP() const {
63 return TMath::Abs(GetPt())*sqrt(1.+GetTgl()*GetTgl());
65 virtual Double_t GetPredictedChi2(const AliCluster*) const { return 0.0; };
66 Double_t GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const ;
67 Double_t GetPt() const {return 1./Get1Pt();}
68 void GetPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const ;
69 void GetGlobalXYZ(Double_t &x, Double_t &y, Double_t &z) const ;
70 Int_t GetSeedLabel() const { return fSeedLab; }
71 Double_t GetSigmaC2() const {return fCcc;}
72 Double_t GetSigmaTgl2() const {return fCtt;}
73 Double_t GetSigmaY2() const {return fCyy;}
74 Double_t GetSigmaZ2() const {return fCzz;}
75 Double_t GetSnp() const {return fX*fC - fE;}
76 Double_t GetTgl() const {return fT;}
77 Double_t GetX() const {return fX;}
78 Double_t GetY() const {return fY;}
79 Double_t GetZ() const {return fZ;}
80 UInt_t * GetBackupIndexes() {return fIndexBackup;}
81 UInt_t * GetIndexes() {return fIndex;}
82 //-----------------------------------------------------------------
83 // This function calculates the Y-coordinate of a track at the plane x=xk.
84 // Needed for matching with the TOF (I.Belikov)
85 Double_t GetYat(Double_t xk) const {
86 Double_t c1=fC*fX - fE, r1=TMath::Sqrt(1.- c1*c1);
87 Double_t c2=fC*xk - fE, r2=TMath::Sqrt(1.- c2*c2);
88 return fY + (xk-fX)*(c1+c2)/(r1+r2);
90 //-----------------------------------------------------------------
91 Int_t GetProlongation(Double_t xk, Double_t &y, Double_t &z);
93 void SetStop(Bool_t stop) {fStopped=stop;}
94 Bool_t GetStop() const {return fStopped;}
96 Int_t PropagateTo(Double_t xr, Double_t x0=8.72, Double_t rho=5.86e-3);
97 void ResetCovariance();
98 void ResetCovariance(Float_t mult);
99 void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
100 Int_t Rotate(Double_t angle);
102 void SetdEdx(Float_t dedx) {fdEdx=dedx;}
103 void SetPIDsignals(Float_t dedx, Int_t i) {fdEdxPlane[i]=dedx;}
104 void SetPIDTimBin(Int_t timbin, Int_t i) {fTimBinPlane[i]=timbin;}
105 void SetLikelihoodElectron(Float_t l) { fLhElectron = l; };
107 void SetSampledEdx(Float_t q, Int_t i) {
108 Double_t s=GetSnp(), t=GetTgl();
109 q*= TMath::Sqrt((1-s*s)/(1+t*t));
112 void SetSampledEdx(Float_t q) {
113 Double_t s=GetSnp(), t=GetTgl();
114 q*= TMath::Sqrt((1-s*s)/(1+t*t));
119 void SetSeedLabel(Int_t lab) { fSeedLab=lab; }
121 Int_t Update(const AliCluster*, Double_t, UInt_t) { return 0; };
122 Int_t Update(const AliTRDcluster* c, Double_t chi2, UInt_t i,
124 Int_t UpdateMI(const AliTRDcluster* c, Double_t chi2, UInt_t i,
125 Double_t h01, Int_t plane);
127 void AddNWrong() {fNWrong++;}
129 Int_t GetNWrong() const {return fNWrong;}
130 Int_t GetNRotate() const {return fNRotate;}
131 Int_t GetNCross() const {return fNCross;}
132 void IncCross() {fNCross++; if (fBackupTrack) fBackupTrack->IncCross();}
133 AliTRDtrack * GetBackupTrack(){return fBackupTrack;}
134 void MakeBackupTrack();
138 Int_t fSeedLab; // track label taken from seeding
139 Float_t fdEdx; // dE/dx
140 Float_t fdEdxPlane[kNPlane]; // dE/dx from all 6 planes
141 Int_t fTimBinPlane[kNPlane]; // time bin of Max cluster from all 6 planes
143 Double_t fAlpha; // rotation angle
144 Double_t fX; // running local X-coordinate of the track (time bin)
145 Bool_t fStopped; // track stop indication
147 Double_t fY; // Y-coordinate of the track
148 Double_t fZ; // Z-coordinate of the track
150 Double_t fT; // tangent of the track momentum dip angle
151 Double_t fC; // track curvature
153 Double_t fCyy; // covariance
154 Double_t fCzy, fCzz; // matrix
155 Double_t fCey, fCez, fCee; // of the
156 Double_t fCty, fCtz, fCte, fCtt; // track
157 Double_t fCcy, fCcz, fCce, fCct, fCcc; // parameters
159 UInt_t fIndex[kMAXCLUSTERSPERTRACK]; // global indexes of clusters
160 UInt_t fIndexBackup[kMAXCLUSTERSPERTRACK]; // backup indexes of clusters - used in iterations
161 Float_t fdQdl[kMAXCLUSTERSPERTRACK]; // cluster amplitudes corrected
164 Float_t fLhElectron; // Likelihood to be an electron
165 Int_t fNWrong; // number of wrong clusters
166 Int_t fNRotate; // number of rotation
167 Int_t fNCross; // number of the cross materials
168 Int_t fNExpected; // expected number of cluster
169 Int_t fNLast; // number of clusters in last 2 layers
170 Int_t fNExpectedLast; // number of expected clusters on last 2 layers
171 Int_t fNdedx; // number of clusters for dEdx measurment
172 Float_t fChi2Last; // chi2 in the last 2 layers
174 AliTRDtrack * fBackupTrack; //! backup track
176 ClassDef(AliTRDtrack,2) // TRD reconstructed tracks