4 //* This file is property of and copyright by the ALICE HLT Project *
5 //* ALICE Experiment at CERN, All rights reserved. *
6 //* See cxx source for full Copyright notice *
9 //* AliHLT3DTrackParam class is under development and currently not in use *
12 #ifndef ALIHLT3DTRACKPARAM_H
13 #define ALIHLT3DTRACKPARAM_H
19 * @class AliHLT3DTrackParam
21 class AliHLT3DTrackParam :public TObject
31 AliHLT3DTrackParam(): fChi2(0),fNDF(0),fSignQ(0){}
33 //* Destructor (empty)
35 virtual ~AliHLT3DTrackParam(){}
44 Double_t GetX() const { return fParam[0]; }
45 Double_t GetY() const { return fParam[1]; }
46 Double_t GetZ() const { return fParam[2]; }
47 Double_t GetPx() const { return fParam[3]; }
48 Double_t GetPy() const { return fParam[4]; }
49 Double_t GetPz() const { return fParam[5]; }
50 Double_t GetChi2() const { return fChi2; }
51 Int_t GetNDF() const { return fNDF; }
52 Int_t GetCharge() const { return fSignQ; }
54 Double_t GetParameter ( int i ) const { return fParam[i]; }
55 Double_t GetCovariance( int i ) const { return fCov[i]; }
56 Double_t GetCovariance( int i, int j ) const { return fCov[( j<=i ) ? i*(i+1)/2+j :j*(j+1)/2+i]; }
58 //* Accessors with calculations( &value, &estimated sigma )
59 //* error flag returned (0 means no error during calculations)
66 Double_t *Param() { return fParam; }
67 Double_t *Cov() { return fCov; }
68 Double_t &X() { return fParam[0]; }
69 Double_t &Y() { return fParam[1]; }
70 Double_t &Z() { return fParam[2]; }
71 Double_t &Px() { return fParam[3]; }
72 Double_t &Py() { return fParam[4]; }
73 Double_t &Pz() { return fParam[5]; }
74 Double_t &Chi2() { return fChi2; }
75 Int_t &NDF() { return fNDF; }
76 Int_t &Charge() { return fSignQ; }
83 //* Transport utilities
85 Double_t GetDStoPoint( Double_t Bz, const Double_t xyz[3], const Double_t *T0=0 ) const;
87 void TransportToDS( Double_t Bz, Double_t DS, Double_t *T0=0 );
89 void TransportToPoint( Double_t Bz, const Double_t xyz[3], Double_t *T0=0 )
91 TransportToDS( Bz,GetDStoPoint(Bz, xyz, T0), T0 ) ;
94 void TransportToPoint( Double_t Bz, Double_t x, Double_t y, Double_t z, Double_t *T0=0 )
96 Double_t xyz[3] = {x,y,z};
97 TransportToPoint( Bz, xyz, T0 );
102 void InitializeCovarianceMatrix();
104 void GetGlueMatrix( const Double_t p[3], Double_t G[6], const Double_t *T0=0 ) const ;
106 void Filter( const Double_t m[3], const Double_t V[6], const Double_t G[6] );
110 void SetDirection( Double_t Direction[3] );
112 void RotateCoordinateSystem( Double_t alpha );
114 void Get5Parameters( Double_t alpha, Double_t T[6], Double_t C[15] ) const;
118 Double_t fParam[6]; // Parameters ( x, y, z, px, py, pz ): 3-position and 3-momentum
119 Double_t fCov[21]; // Covariance matrix
120 Double_t fChi2; // Chi^2
121 Int_t fNDF; // Number of Degrees of Freedom
122 Int_t fSignQ; // Charge
124 ClassDef(AliHLT3DTrackParam, 1);