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 */
15 class AliExternalTrackParam: public TObject {
17 AliExternalTrackParam();
18 AliExternalTrackParam(Double_t x, Double_t alpha,
19 const Double_t param[5], const Double_t covar[15]);
20 AliExternalTrackParam(const AliKalmanTrack& track);
22 virtual void SetMass(Double_t mass) {fMass=mass;}
23 virtual Double_t GetMass() const {return fMass;}
25 virtual const Double_t* GetParameter() const;
26 virtual const Double_t* GetCovariance() const;
27 virtual Double_t X() const {return fX;};
28 virtual Double_t Alpha() const {return fAlpha;};
29 virtual AliExternalTrackParam* CreateExternalParam() const;
30 virtual void ResetCovariance(Double_t factor = 10.,
31 Bool_t clearOffDiagonal = kTRUE);
32 virtual Double_t Y() const {return fParam[0];};
33 virtual Double_t Z() const {return fParam[1];};
34 virtual void GetXYZ(Float_t r[3]) const;
35 virtual void GetGlobalXYZ(Double_t &x, Double_t &y, Double_t &z ) const;
36 virtual Bool_t PropagateTo(Double_t x, Double_t x0, Double_t rho);
37 virtual Bool_t PropagateToDCA(Double_t x, Double_t y, Double_t x0, Double_t rho);
38 virtual Bool_t RotateTo(Double_t alpha);
39 virtual Bool_t CorrectForMaterial(Double_t d, Double_t x0, Double_t rho);
40 virtual Bool_t GetProlongationAt(Double_t x, Double_t& y,
42 virtual Double_t GetXAtVertex(Double_t x = 0, Double_t y = 0) const;
44 // virtual Double_t GetPredictedChi2(const AliCluster* cluster);
45 // virtual Bool_t Update(const AliCluster* cluster);
47 virtual Double_t SigmaPhi() const;
48 virtual Double_t SigmaTheta() const;
49 virtual Double_t SigmaPt() const;
50 virtual TVector3 Momentum() const;
51 virtual TVector3 Position() const;
53 virtual void Print(Option_t* option = "") const;
54 // local magnetic field manipulation
55 void SaveLocalConvConst();
56 Double_t GetLocalConvConst() const;
58 static void SetFieldMap(const AliMagF *map) { fgkFieldMap=map; }
59 static const AliMagF *GetFieldMap() { return fgkFieldMap; }
61 static void SetUniformFieldTracking() {
63 printf("AliKalmanTrack: Field map has not been set !\n");
66 fgConvConst=1000/0.299792458/(fgkFieldMap->SolenoidField()+1e-13);
68 static void SetNonuniformFieldTracking() { fgConvConst=0.; }
71 Double_t fMass; // mass associated to the particle
72 Double_t fX; // x coordinate for the parametrisation
73 Double_t fAlpha; // azimuthal angle for the parametrisation
74 Double_t fParam[5]; // track parameter (y, z, sin(azimuthal angel), tan(dip angle), 1/pt)
75 Double_t fCovar[15]; // track parameter covariance
77 static const AliMagF *fgkFieldMap;//pointer to the magnetic field map
78 static Double_t fgConvConst; //conversion "curvature(1/cm) -> pt(GeV/c)"
79 Double_t fLocalConvConst; //local conversion "curvature(1/cm) -> pt(GeV/c)"
82 ClassDef(AliExternalTrackParam, 3)
86 inline void AliExternalTrackParam::SaveLocalConvConst() {
87 //---------------------------------------------------------------------
88 // Saves local conversion constant "curvature (1/cm) -> pt (GeV/c)"
89 //---------------------------------------------------------------------
90 if (fgConvConst > 0 || fgConvConst < 0) return; //uniform field tracking
91 Float_t r[3]={0.,0.,0.}; GetXYZ(r);
92 Float_t b[3]; fgkFieldMap->Field(r,b);
93 fLocalConvConst=1000/0.299792458/(1e-13 - b[2]);
96 inline Double_t AliExternalTrackParam::GetLocalConvConst() const {
97 //---------------------------------------------------------------------
98 // Returns conversion constant "curvature (1/cm) -> pt (GeV/c)"
99 //---------------------------------------------------------------------
100 if (fgConvConst > 0 || fgConvConst < 0) return fgConvConst; //uniform field tracking
101 return fLocalConvConst;
105 inline void AliExternalTrackParam::GetXYZ(Float_t r[3]) const {
106 //---------------------------------------------------------------------
107 // Returns the position of the track in the global coord. system
108 //---------------------------------------------------------------------
109 Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
110 r[0]=fX*cs - fParam[0]*sn; r[1]=fX*sn + fParam[0]*cs; r[2]=fParam[1];
113 inline void AliExternalTrackParam::GetGlobalXYZ(Double_t &x, Double_t &y, Double_t &z) const {
114 //---------------------------------------------------------------------
115 // Returns the position of the track in the global coord. system
116 //---------------------------------------------------------------------
117 Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
118 x=fX*cs - fParam[0]*sn; y=fX*sn + fParam[0]*cs; z=fParam[1];