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 */
6 //-------------------------------------------------------------------------
9 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
10 // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
11 //-------------------------------------------------------------------------
14 /*****************************************************************************
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 *****************************************************************************/
28 #include <AliKalmanTrack.h>
30 #include "AliITSrecoV2.h"
35 //_____________________________________________________________________________
36 class AliITStrackV2 : public AliKalmanTrack {
39 AliITStrackV2(AliESDtrack& t,Bool_t c=kFALSE) throw (const Char_t *);
40 AliITStrackV2(const AliITStrackV2& t);
41 Int_t PropagateToVertex(Double_t d=0., Double_t x0=0.);
42 Int_t Propagate(Double_t alpha, Double_t xr);
43 virtual Int_t CorrectForMaterial(Double_t d, Double_t x0=21.82);
44 Int_t PropagateTo(Double_t xr, Double_t d, Double_t x0=21.82);
45 Int_t Update(const AliCluster* cl,Double_t chi2,UInt_t i);
46 Int_t Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]);
47 void SetdEdx(Double_t dedx) {fdEdx=dedx;}
48 void SetSampledEdx(Float_t q, Int_t i);
49 void CookdEdx(Double_t low=0., Double_t up=0.51);
50 void SetDetectorIndex(Int_t i) {SetLabel(i);}
51 void ResetCovariance();
52 void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
53 void UpdateESDtrack(ULong_t flags) const;
55 AliESDtrack *GetESDtrack() const {return fESDtrack;}
57 Int_t GetDetectorIndex() const {return GetLabel();}
58 Double_t GetX() const {return fX;}
59 Double_t GetAlpha()const {return fAlpha;}
60 Double_t GetdEdx() const {return fdEdx;}
61 Double_t GetPIDsignal() const {return GetdEdx();}
62 Double_t GetY() const {return fP0;}
63 Double_t GetZ() const {return fP1;}
64 Double_t GetSnp() const {return fP2;}
65 Double_t GetTgl() const {return fP3;}
66 Double_t GetC() const {return fP4;}
67 Double_t Get1Pt() const {
68 return (TMath::Sign(1e-9,fP4) + fP4)*GetLocalConvConst();
70 Double_t GetD(Double_t x=0, Double_t y=0) const;
71 Double_t GetZat(Double_t x=0) const;
73 Double_t GetSigmaY2() const {return fC00;}
74 Double_t GetSigmaZ2() const {return fC11;}
75 Int_t Compare(const TObject *o) const;
76 void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
77 void GetExternalCovariance(Double_t cov[15]) const ;
78 Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
79 Int_t GetGlobalXYZat(Double_t r,Double_t &x,Double_t &y,Double_t &z) const;
80 void ApproximateHelixWithLine(Double_t xk, AliITSStrLine *line);
81 Double_t GetPredictedChi2(const AliCluster *cluster) const;
82 Int_t Invariant() const;
85 void GetXYZ(Float_t r[3]) const;
87 Double_t fX; // X-coordinate of this track (reference plane)
88 Double_t fAlpha; // rotation angle
90 Double_t fdEdx; // dE/dx
92 Double_t fP0; // Y-coordinate of a track
93 Double_t fP1; // Z-coordinate of a track
94 Double_t fP2; // sine of the track momentum azimuthal angle
95 Double_t fP3; // tangent of the track momentum dip angle
96 Double_t fP4; // track curvature
98 Double_t fC00; // covariance
99 Double_t fC10, fC11; // matrix
100 Double_t fC20, fC21, fC22; // of the
101 Double_t fC30, fC31, fC32, fC33; // track
102 Double_t fC40, fC41, fC42, fC43, fC44; // parameters
104 UInt_t fIndex[kMaxLayer]; // indices of associated clusters
105 Float_t fdEdxSample[4]; // array of dE/dx samples b.b.
107 AliESDtrack *fESDtrack; //! pointer to the connected ESD track
108 ClassDef(AliITStrackV2,4) //ITS reconstructed track
112 void AliITStrackV2::GetExternalParameters(Double_t& xr, Double_t x[5]) const {
113 //---------------------------------------------------------------------
114 // This function return external ITS track representation
115 //---------------------------------------------------------------------
117 x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt();
121 void AliITStrackV2::SetSampledEdx(Float_t q, Int_t i) {
122 //----------------------------------------------------------------------
123 // This function stores dEdx sample corrected for the track segment length
124 // Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
125 //----------------------------------------------------------------------
128 Double_t s=GetSnp(), t=GetTgl();
129 q *= TMath::Sqrt((1-s*s)/(1+t*t));
133 inline void AliITStrackV2::GetXYZ(Float_t r[3]) const {
134 //---------------------------------------------------------------------
135 // Returns the position of the track in the global coord. system
136 //---------------------------------------------------------------------
137 Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
138 r[0]=fX*cs - fP0*sn; r[1]=fX*sn + fP0*cs; r[2]=fP1;