1 #ifndef ALIEXTERNALTRACKPARAM_H
2 #define ALIEXTERNALTRACKPARAM_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
14 class AliTrackReference;
16 class AliExternalTrackParam: public TObject {
18 AliExternalTrackParam();
19 AliExternalTrackParam(Double_t x, Double_t alpha,
20 const Double_t param[5], const Double_t covar[15]);
21 AliExternalTrackParam(const AliKalmanTrack& track);
22 static AliExternalTrackParam * MakeTrack(const AliTrackReference *ref, Double_t mass);
24 virtual const Double_t* GetParameter() const;
25 virtual const Double_t* GetCovariance() const;
26 virtual Double_t X() const {return fX;};
27 virtual Double_t Alpha() const {return fAlpha;};
28 virtual AliExternalTrackParam* CreateExternalParam() const;
29 virtual void ResetCovariance(Double_t factor = 10.,
30 Bool_t clearOffDiagonal = kTRUE);
31 virtual Double_t Y() const {return fParam[0];};
32 virtual Double_t Z() const {return fParam[1];};
33 virtual void GetXYZ(Float_t r[3]) const;
34 virtual void GetGlobalXYZ(Double_t &x, Double_t &y, Double_t &z ) const;
35 virtual Bool_t PropagateTo(Double_t x, Double_t x0, Double_t rho);
36 virtual Bool_t PropagateToDCA(Double_t x, Double_t y, Double_t x0, Double_t rho);
37 virtual Bool_t RotateTo(Double_t alpha);
38 virtual Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t rho);
39 virtual Bool_t GetProlongationAt(Double_t x, Double_t& y,
41 virtual Double_t GetXAtVertex(Double_t x = 0, Double_t y = 0) const;
43 // virtual Double_t GetPredictedChi2(const AliCluster* cluster);
44 // virtual Bool_t Update(const AliCluster* cluster);
46 virtual Double_t SigmaPhi() const;
47 virtual Double_t SigmaTheta() const;
48 virtual Double_t SigmaPt() const;
49 virtual TVector3 Momentum() const;
50 virtual TVector3 Position() const;
52 virtual void Print(Option_t* option = "") const;
53 // local magnetic field manipulation
54 void SaveLocalConvConst();
55 Double_t GetLocalConvConst() const;
57 static void SetFieldMap(const AliMagF *map) { fgkFieldMap=map; }
58 static const AliMagF *GetFieldMap() { return fgkFieldMap; }
60 static void SetUniformFieldTracking() {
62 printf("AliKalmanTrack: Field map has not been set !\n");
65 fgConvConst=1000/0.299792458/(fgkFieldMap->SolenoidField()+1e-13);
67 static void SetNonuniformFieldTracking() { fgConvConst=0.; }
70 Double_t fMass; // mass associated to the particle
71 Double_t fX; // x coordinate for the parametrisation
72 Double_t fAlpha; // azimuthal angle for the parametrisation
73 Double_t fParam[5]; // track parameter (y, z, sin(azimuthal angel), tan(dip angle), 1/pt)
74 Double_t fCovar[15]; // track parameter covariance
76 static const AliMagF *fgkFieldMap;//pointer to the magnetic field map
77 static Double_t fgConvConst; //conversion "curvature(1/cm) -> pt(GeV/c)"
78 Double_t fLocalConvConst; //local conversion "curvature(1/cm) -> pt(GeV/c)"
81 ClassDef(AliExternalTrackParam, 3)
85 inline void AliExternalTrackParam::SaveLocalConvConst() {
86 //---------------------------------------------------------------------
87 // Saves local conversion constant "curvature (1/cm) -> pt (GeV/c)"
88 //---------------------------------------------------------------------
89 if (fgConvConst > 0 || fgConvConst < 0) return; //uniform field tracking
90 Float_t r[3]={0.,0.,0.}; GetXYZ(r);
91 Float_t b[3]; fgkFieldMap->Field(r,b);
92 fLocalConvConst=1000/0.299792458/(1e-13 - b[2]);
95 inline Double_t AliExternalTrackParam::GetLocalConvConst() const {
96 //---------------------------------------------------------------------
97 // Returns conversion constant "curvature (1/cm) -> pt (GeV/c)"
98 //---------------------------------------------------------------------
99 if (fgConvConst > 0 || fgConvConst < 0) return fgConvConst; //uniform field tracking
100 return fLocalConvConst;
104 inline void AliExternalTrackParam::GetXYZ(Float_t r[3]) const {
105 //---------------------------------------------------------------------
106 // Returns the position of the track in the global coord. system
107 //---------------------------------------------------------------------
108 Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
109 r[0]=fX*cs - fParam[0]*sn; r[1]=fX*sn + fParam[0]*cs; r[2]=fParam[1];
112 inline void AliExternalTrackParam::GetGlobalXYZ(Double_t &x, Double_t &y, Double_t &z) const {
113 //---------------------------------------------------------------------
114 // Returns the position of the track in the global coord. system
115 //---------------------------------------------------------------------
116 Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
117 x=fX*cs - fParam[0]*sn; y=fX*sn + fParam[0]*cs; z=fParam[1];