3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
7 //-------------------------------------------------------
10 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
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))
24 #include <AliKalmanTrack.h>
27 #include "AliTPCreco.h"
28 #include "AliExternalTrackParam.h"
32 //_____________________________________________________________________________
33 class AliTPCtrack : public AliKalmanTrack {
36 AliTPCtrack(UInt_t index, const Double_t xx[5],
37 const Double_t cc[15], Double_t xr, Double_t alpha);
38 AliTPCtrack(const AliKalmanTrack& t, Double_t alpha);
39 AliTPCtrack(const AliESDtrack& t);
40 AliTPCtrack(const AliTPCtrack& t);
41 virtual ~AliTPCtrack() {}
42 Int_t PropagateToVertex(Double_t x0=36.66,Double_t rho=1.2e-3);
43 Int_t Rotate(Double_t angle);
44 void SetdEdx(Double_t dedx) {fdEdx=dedx;}
46 Double_t GetYat(Double_t x) const ;
47 Double_t GetX() const {return fX;}
48 Double_t GetAlpha() const {return fAlpha;}
49 Double_t GetdEdx() const {return fdEdx;}
50 Double_t GetPIDsignal() const {return GetdEdx();}
52 Double_t GetY() const {return fP0;}
53 Double_t GetZ() const {return fP1;}
54 Double_t GetSnp() const {return fX*fP4 - fP2;}
56 Get1Pt() const { return (1e-9*TMath::Abs(fP4)/fP4 + fP4)*GetConvConst(); }
57 Double_t GetTgl() const {return fP3;}
59 Double_t GetSigmaY2() const {return fC00;}
60 Double_t GetSigmaZ2() const {return fC11;}
62 // Some methods useful for users. Implementation is not
63 // optimized for speed but for minimal maintanance effort
65 Double_t Theta() const {return TMath::Pi()/2.-TMath::ATan(GetTgl());}
66 Double_t Px() const {return TMath::Cos(Phi())/TMath::Abs(Get1Pt());}
67 Double_t Py() const {return TMath::Sin(Phi())/TMath::Abs(Get1Pt());}
68 Double_t Pz() const {return GetTgl()/TMath::Abs(Get1Pt());}
69 Double_t Pt() const {return 1./TMath::Abs(Get1Pt());}
70 Double_t P() const {return TMath::Sqrt(Pt()*Pt()+Pz()*Pz());}
72 Int_t Compare(const TObject *o) const;
74 void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
75 void GetExternalCovariance(Double_t cov[15]) const ;
79 void GetBarrelTrack(AliBarrelTrack *track)const;
81 void ResetNWrong() {fNWrong = 0;}
82 void ResetNRotation() {fNRotation = 0;}
84 Int_t GetNWrong() const {return fNWrong;}
85 Int_t GetNRotation() const {return fNRotation;}
87 Int_t GetNumber() const {return fNumber;}
88 void SetNumber(Int_t n) {fNumber = n;}
91 Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
93 //******** To be removed next release !!! **************
94 Double_t GetEta() const {return fP2;}
95 Double_t GetC() const {return fP4;}
96 void GetCovariance(Double_t cc[15]) const {
98 cc[1 ]=fC10; cc[2 ]=fC11;
99 cc[3 ]=fC20; cc[4 ]=fC21; cc[5 ]=fC22;
100 cc[6 ]=fC40; cc[7 ]=fC41; cc[8 ]=fC42; cc[9 ]=fC44;
101 cc[10]=fC30; cc[11]=fC31; cc[12]=fC32; cc[13]=fC43; cc[14]=fC33;
103 //******************************************************
105 virtual Double_t GetPredictedChi2(const AliCluster *cluster) const;
106 Int_t PropagateTo(Double_t xr,Double_t x0=28.94,Double_t rho=0.9e-3);
107 Int_t Update(const AliCluster* c, Double_t chi2, UInt_t i);
108 void ResetCovariance();
109 void UpdatePoints();//update points
110 Float_t* GetPoints() {return fPoints;}
112 // TClonesArray * fHelixIn; //array of helixes
113 //TClonesArray * fHelixOut; //array of helixes
115 Float_t Density(Int_t row0, Int_t row1); //calculate cluster density
116 Float_t Density2(Int_t row0, Int_t row1); //calculate cluster density
117 Double_t GetZat0() const;
118 Double_t GetD(Double_t x=0, Double_t y=0) const;
119 AliExternalTrackParam & GetReference(){ return fReference;}
120 void UpdateReference(){ new (&fReference) AliExternalTrackParam(*this);}
121 Int_t GetKinkIndex(Int_t i) const{ return fKinkIndexes[i];}
122 Int_t* GetKinkIndexes() { return fKinkIndexes;}
124 Double_t fX; // X-coordinate of this track (reference plane)
125 Double_t fAlpha; // Rotation angle the local (TPC sector)
126 // coordinate system and the global ALICE one.
128 Double_t fdEdx; // dE/dx
130 Double_t fP0; // Y-coordinate of a track
131 Double_t fP1; // Z-coordinate of a track
132 Double_t fP2; // C*x0
133 Double_t fP3; // tangent of the track momentum dip angle
134 Double_t fP4; // track curvature
136 Double_t fC00; // covariance
137 Double_t fC10, fC11; // matrix
138 Double_t fC20, fC21, fC22; // of the
139 Double_t fC30, fC31, fC32, fC33; // track
140 Double_t fC40, fC41, fC42, fC43, fC44; // parameters
142 Int_t fIndex[kMaxRow]; // indices of associated clusters
143 Float_t fPoints[4]; //first, max dens row end points of the track and max density
145 Int_t fNWrong; // number of wrong clusters
146 Int_t fNRotation; // number of rotations
147 Int_t fNumber; // magic number used for number of clusters
149 Float_t fSdEdx; // sigma of dedx
151 Int_t fNFoundable; //number of foundable clusters - dead zone taken to the account
152 Bool_t fBConstrain; // indicate seeding with vertex constrain
153 Int_t fLastPoint; // last cluster position
154 Int_t fFirstPoint; // first cluster position
155 Int_t fRemoval; // removal factor
156 Int_t fTrackType; // track type - 0 - normal - 1 - kink - 2 -V0 3- double found
157 Int_t fLab2; // index of corresponding track (kink, V0, double)
158 Int_t fNShared; // number of shared points
159 AliExternalTrackParam fReference; // track parameters at the middle of the chamber
160 Float_t fKinkPoint[12]; //radius, of kink, dfi and dtheta
161 Int_t fKinkIndexes[3]; // kink indexes - minus = mother + daughter
162 ClassDef(AliTPCtrack,1) // Time Projection Chamber reconstructed tracks
166 void AliTPCtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const {
167 // This function return external TPC track representation
169 x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt();