Return the most probable momentum if the magnetic field is too weak and the momentum...
[u/mrichter/AliRoot.git] / ITS / AliITStrackV2.h
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006b5f7f 1#ifndef ALIITSTRACKV2_H
2#define ALIITSTRACKV2_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6//-------------------------------------------------------------------------
7// ITS Track Class
8//
9// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
a9a2d814 10// dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
006b5f7f 11//-------------------------------------------------------------------------
12
13
14/*****************************************************************************
15 * December 18, 2000 *
16 * Internal view of the ITS track parametrisation as well as the order of *
17 * track parameters are subject for possible changes ! *
18 * Use GetExternalParameters() and GetExternalCovariance() to access ITS *
19 * track information regardless of its internal representation. *
20 * This formation is now fixed in the following way: *
21 * external param0: local Y-coordinate of a track (cm) *
22 * external param1: local Z-coordinate of a track (cm) *
23 * external param2: local sine of the track momentum azimuthal angle *
24 * external param3: tangent of the track momentum dip angle *
25 * external param4: 1/pt (1/(GeV/c)) *
26 *****************************************************************************/
27
28#include <AliKalmanTrack.h>
29
30#include "AliITSrecoV2.h"
31
83d73500 32class AliESDtrack;
f753671b 33class AliStrLine;
006b5f7f 34
35//_____________________________________________________________________________
8676d691 36class AliITStrackV2 : public AliKalmanTrack {
006b5f7f 37public:
22b13da0 38 AliITStrackV2();
67c3dcbe 39 AliITStrackV2(AliESDtrack& t,Bool_t c=kFALSE) throw (const Char_t *);
006b5f7f 40 AliITStrackV2(const AliITStrackV2& t);
880f41b9 41 Int_t PropagateToVertex(Double_t d=0., Double_t x0=0.);
a9a2d814 42 Int_t Propagate(Double_t alpha, Double_t xr);
15dd636f 43 virtual Int_t CorrectForMaterial(Double_t d, Double_t x0=21.82);
a9a2d814 44 Int_t PropagateTo(Double_t xr, Double_t d, Double_t x0=21.82);
c7bafca9 45 Double_t PropagateToDCA(AliKalmanTrack *p, Double_t d=0., Double_t x0=0.);
7f6ddf58 46 Int_t Update(const AliCluster* cl,Double_t chi2,UInt_t i);
8676d691 47 Int_t Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]);
7f6ddf58 48 void SetdEdx(Double_t dedx) {fdEdx=dedx;}
a9a2d814 49 void SetSampledEdx(Float_t q, Int_t i);
50 void CookdEdx(Double_t low=0., Double_t up=0.51);
006b5f7f 51 void SetDetectorIndex(Int_t i) {SetLabel(i);}
7f6ddf58 52 void ResetCovariance();
53 void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
15dd636f 54 void UpdateESDtrack(ULong_t flags) const;
e43c066c 55
1aedd96e 56 AliESDtrack *GetESDtrack() const {return fESDtrack;}
e43c066c 57
006b5f7f 58 Int_t GetDetectorIndex() const {return GetLabel();}
59 Double_t GetX() const {return fX;}
60 Double_t GetAlpha()const {return fAlpha;}
7f6ddf58 61 Double_t GetdEdx() const {return fdEdx;}
83d73500 62 Double_t GetPIDsignal() const {return GetdEdx();}
006b5f7f 63 Double_t GetY() const {return fP0;}
64 Double_t GetZ() const {return fP1;}
65 Double_t GetSnp() const {return fP2;}
66 Double_t GetTgl() const {return fP3;}
67c3dcbe 67 Double_t GetC() const {return fP4;}
5773defd 68 Double_t Get1Pt() const;
a6a6f799 69 Double_t GetD(Double_t x=0, Double_t y=0) const;
babd135a 70 Double_t GetZat(Double_t x=0) const;
71
006b5f7f 72 Double_t GetSigmaY2() const {return fC00;}
73 Double_t GetSigmaZ2() const {return fC11;}
006b5f7f 74 Int_t Compare(const TObject *o) const;
006b5f7f 75 void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
76 void GetExternalCovariance(Double_t cov[15]) const ;
006b5f7f 77 Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
78 Int_t GetGlobalXYZat(Double_t r,Double_t &x,Double_t &y,Double_t &z) const;
f753671b 79 void ApproximateHelixWithLine(Double_t xk, AliStrLine *line);
006b5f7f 80 Double_t GetPredictedChi2(const AliCluster *cluster) const;
ef7253ac 81 Int_t Invariant() const;
82
83 void SetExtraCluster(Int_t i, Int_t idx) {fIndex[kMaxLayer+i]=idx;}
84 Int_t GetExtraCluster(Int_t i) const {return fIndex[kMaxLayer+i];}
006b5f7f 85
235b705f 86protected:
c84a5e9e 87 void GetXYZ(Float_t r[3]) const;
88
006b5f7f 89 Double_t fX; // X-coordinate of this track (reference plane)
90 Double_t fAlpha; // rotation angle
91
92 Double_t fdEdx; // dE/dx
93
94 Double_t fP0; // Y-coordinate of a track
95 Double_t fP1; // Z-coordinate of a track
96 Double_t fP2; // sine of the track momentum azimuthal angle
97 Double_t fP3; // tangent of the track momentum dip angle
98 Double_t fP4; // track curvature
99
100 Double_t fC00; // covariance
101 Double_t fC10, fC11; // matrix
102 Double_t fC20, fC21, fC22; // of the
103 Double_t fC30, fC31, fC32, fC33; // track
104 Double_t fC40, fC41, fC42, fC43, fC44; // parameters
15dd636f 105
ef7253ac 106 Int_t fIndex[2*kMaxLayer]; // indices of associated clusters
107 Float_t fdEdxSample[4]; // array of dE/dx samples b.b.
15dd636f 108
ef7253ac 109 AliESDtrack *fESDtrack; //! pointer to the connected ESD track
110 ClassDef(AliITStrackV2,5) //ITS reconstructed track
006b5f7f 111};
112
113inline
114void AliITStrackV2::GetExternalParameters(Double_t& xr, Double_t x[5]) const {
115 //---------------------------------------------------------------------
83d73500 116 // This function return external ITS track representation
006b5f7f 117 //---------------------------------------------------------------------
118 xr=fX;
5773defd 119 x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl();
120 x[4]=(TMath::Sign(1e-9,fP4) + fP4)*GetLocalConvConst();
006b5f7f 121}
a9a2d814 122
23efe5f1 123inline
124void AliITStrackV2::SetSampledEdx(Float_t q, Int_t i) {
125 //----------------------------------------------------------------------
a9a2d814 126 // This function stores dEdx sample corrected for the track segment length
127 // Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
23efe5f1 128 //----------------------------------------------------------------------
a9a2d814 129 if (i<0) return;
130 if (i>3) return;
23efe5f1 131 Double_t s=GetSnp(), t=GetTgl();
23efe5f1 132 q *= TMath::Sqrt((1-s*s)/(1+t*t));
133 fdEdxSample[i]=q;
23efe5f1 134}
c84a5e9e 135
136inline void AliITStrackV2::GetXYZ(Float_t r[3]) const {
137 //---------------------------------------------------------------------
138 // Returns the position of the track in the global coord. system
139 //---------------------------------------------------------------------
140 Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
141 r[0]=fX*cs - fP0*sn; r[1]=fX*sn + fP0*cs; r[2]=fP1;
142}
143
006b5f7f 144#endif
145
146