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 Double_t PropagateToDCA(AliKalmanTrack *p, Double_t d=0., Double_t x0=0.);
46 Int_t Update(const AliCluster* cl,Double_t chi2,UInt_t i);
47 Int_t Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]);
48 void SetdEdx(Double_t dedx) {fdEdx=dedx;}
49 void SetSampledEdx(Float_t q, Int_t i);
50 void CookdEdx(Double_t low=0., Double_t up=0.51);
51 void SetDetectorIndex(Int_t i) {SetLabel(i);}
52 void ResetCovariance();
53 void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
54 void UpdateESDtrack(ULong_t flags) const;
56 AliESDtrack *GetESDtrack() const {return fESDtrack;}
58 Int_t GetDetectorIndex() const {return GetLabel();}
59 Double_t GetX() const {return fX;}
60 Double_t GetAlpha()const {return fAlpha;}
61 Double_t GetdEdx() const {return fdEdx;}
62 Double_t GetPIDsignal() const {return GetdEdx();}
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;}
67 Double_t GetC() const {return fP4;}
68 Double_t Get1Pt() const {
69 return (TMath::Sign(1e-9,fP4) + fP4)*GetLocalConvConst();
71 Double_t GetD(Double_t x=0, Double_t y=0) const;
72 Double_t GetZat(Double_t x=0) const;
74 Double_t GetSigmaY2() const {return fC00;}
75 Double_t GetSigmaZ2() const {return fC11;}
76 Int_t Compare(const TObject *o) const;
77 void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
78 void GetExternalCovariance(Double_t cov[15]) const ;
79 Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
80 Int_t GetGlobalXYZat(Double_t r,Double_t &x,Double_t &y,Double_t &z) const;
81 void ApproximateHelixWithLine(Double_t xk, AliStrLine *line);
82 Double_t GetPredictedChi2(const AliCluster *cluster) const;
83 Int_t Invariant() const;
85 void SetExtraCluster(Int_t i, Int_t idx) {fIndex[kMaxLayer+i]=idx;}
86 Int_t GetExtraCluster(Int_t i) const {return fIndex[kMaxLayer+i];}
89 void GetXYZ(Float_t r[3]) const;
91 Double_t fX; // X-coordinate of this track (reference plane)
92 Double_t fAlpha; // rotation angle
94 Double_t fdEdx; // dE/dx
96 Double_t fP0; // Y-coordinate of a track
97 Double_t fP1; // Z-coordinate of a track
98 Double_t fP2; // sine of the track momentum azimuthal angle
99 Double_t fP3; // tangent of the track momentum dip angle
100 Double_t fP4; // track curvature
102 Double_t fC00; // covariance
103 Double_t fC10, fC11; // matrix
104 Double_t fC20, fC21, fC22; // of the
105 Double_t fC30, fC31, fC32, fC33; // track
106 Double_t fC40, fC41, fC42, fC43, fC44; // parameters
108 Int_t fIndex[2*kMaxLayer]; // indices of associated clusters
109 Float_t fdEdxSample[4]; // array of dE/dx samples b.b.
111 AliESDtrack *fESDtrack; //! pointer to the connected ESD track
112 ClassDef(AliITStrackV2,5) //ITS reconstructed track
116 void AliITStrackV2::GetExternalParameters(Double_t& xr, Double_t x[5]) const {
117 //---------------------------------------------------------------------
118 // This function return external ITS track representation
119 //---------------------------------------------------------------------
121 x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt();
125 void AliITStrackV2::SetSampledEdx(Float_t q, Int_t i) {
126 //----------------------------------------------------------------------
127 // This function stores dEdx sample corrected for the track segment length
128 // Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
129 //----------------------------------------------------------------------
132 Double_t s=GetSnp(), t=GetTgl();
133 q *= TMath::Sqrt((1-s*s)/(1+t*t));
137 inline void AliITStrackV2::GetXYZ(Float_t r[3]) const {
138 //---------------------------------------------------------------------
139 // Returns the position of the track in the global coord. system
140 //---------------------------------------------------------------------
141 Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
142 r[0]=fX*cs - fP0*sn; r[1]=fX*sn + fP0*cs; r[2]=fP1;