[u/mrichter/AliRoot.git] / ITS / AliITStrackV2.h

#ifndef ALIITSTRACKV2_H
#define ALIITSTRACKV2_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

//-------------------------------------------------------------------------
//                       ITS Track Class
//
//        Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch 
//     dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
//-------------------------------------------------------------------------


/*****************************************************************************
 *                          December 18, 2000                                *
 *  Internal view of the ITS track parametrisation as well as the order of   *
 *           track parameters are subject for possible changes !             *
 *  Use GetExternalParameters() and GetExternalCovariance() to access ITS    *
 *      track information regardless of its internal representation.         *
 * This formation is now fixed in the following way:                         *
 *      external param0:   local Y-coordinate of a track (cm)                *
 *      external param1:   local Z-coordinate of a track (cm)                *
 *      external param2:   local sine of the track momentum azimuthal angle  *
 *      external param3:   tangent of the track momentum dip angle           *
 *      external param4:   1/pt (1/(GeV/c))                                  *
 *****************************************************************************/

#include <AliKalmanTrack.h>

#include "AliITSrecoV2.h"

class AliESDtrack;

//_____________________________________________________________________________
class AliITStrackV2 : public AliKalmanTrack {
public:
  AliITStrackV2();
  AliITStrackV2(AliESDtrack& t,Bool_t c=kFALSE) throw (const Char_t *);
  AliITStrackV2(const AliITStrackV2& t);
  Int_t PropagateToVertex(Double_t d=0., Double_t x0=0.);
  Int_t Propagate(Double_t alpha, Double_t xr);
  virtual Int_t CorrectForMaterial(Double_t d, Double_t x0=21.82);
  Int_t PropagateTo(Double_t xr, Double_t d, Double_t x0=21.82);
  Int_t Update(const AliCluster* cl,Double_t chi2,UInt_t i);
  Int_t Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]);
  void SetdEdx(Double_t dedx) {fdEdx=dedx;}
  void SetSampledEdx(Float_t q, Int_t i);
  void CookdEdx(Double_t low=0., Double_t up=0.51);
  void SetDetectorIndex(Int_t i) {SetLabel(i);}
  void ResetCovariance();
  void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
  void UpdateESDtrack(ULong_t flags) const;
  void SetConstrainedESDtrack(Double_t chi2) const; 
  
  AliESDtrack *GetESDtrack() const {return fESDtrack;}

  Int_t GetDetectorIndex() const {return GetLabel();}
  Double_t GetX()    const {return fX;}
  Double_t GetAlpha()const {return fAlpha;}
  Double_t GetdEdx() const {return fdEdx;}
  Double_t GetPIDsignal() const {return GetdEdx();}
  Double_t GetY()    const {return fP0;}
  Double_t GetZ()    const {return fP1;}
  Double_t GetSnp()  const {return fP2;}
  Double_t GetTgl()  const {return fP3;}
  Double_t GetC()    const {return fP4;}
  Double_t Get1Pt() const {
      return (TMath::Sign(1e-9,fP4) + fP4)*GetLocalConvConst();
  }
  Double_t GetD(Double_t x=0, Double_t y=0) const;
  Double_t GetZat(Double_t x=0) const;

  Double_t GetSigmaY2() const {return fC00;}
  Double_t GetSigmaZ2() const {return fC11;}
  Int_t Compare(const TObject *o) const;
  void GetExternalParameters(Double_t& xr, Double_t x[5]) const ;
  void GetExternalCovariance(Double_t cov[15]) const ;
  Int_t GetClusterIndex(Int_t i) const {return fIndex[i];}
  Int_t GetGlobalXYZat(Double_t r,Double_t &x,Double_t &y,Double_t &z) const;
  Double_t GetPredictedChi2(const AliCluster *cluster) const;
   Int_t Invariant() const;
 
protected:
  void GetXYZ(Float_t r[3]) const;

  Double_t fX;              // X-coordinate of this track (reference plane)
  Double_t fAlpha;          // rotation angle

  Double_t fdEdx;           // dE/dx

  Double_t fP0;             // Y-coordinate of a track 
  Double_t fP1;             // Z-coordinate of a track
  Double_t fP2;             // sine of the track momentum azimuthal angle
  Double_t fP3;             // tangent of the track momentum dip angle
  Double_t fP4;             // track curvature

  Double_t fC00;                         // covariance
  Double_t fC10, fC11;                   // matrix
  Double_t fC20, fC21, fC22;             // of the
  Double_t fC30, fC31, fC32, fC33;       // track
  Double_t fC40, fC41, fC42, fC43, fC44; // parameters 

  UInt_t fIndex[kMaxLayer]; // indices of associated clusters 
  Float_t fdEdxSample[4];   // array of dE/dx samples b.b.

  AliESDtrack *fESDtrack;   //! pointer to the connected ESD track
  ClassDef(AliITStrackV2,4)   //ITS reconstructed track
};

inline 
void AliITStrackV2::GetExternalParameters(Double_t& xr, Double_t x[5]) const {
  //---------------------------------------------------------------------
  // This function return external ITS track representation
  //---------------------------------------------------------------------
     xr=fX;          
     x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt();
}

inline
void AliITStrackV2::SetSampledEdx(Float_t q, Int_t i) {
  //----------------------------------------------------------------------
  // This function stores dEdx sample corrected for the track segment length 
  // Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
  //----------------------------------------------------------------------
  if (i<0) return;
  if (i>3) return;
  Double_t s=GetSnp(), t=GetTgl();
  q *= TMath::Sqrt((1-s*s)/(1+t*t));
  fdEdxSample[i]=q;
}

inline void AliITStrackV2::GetXYZ(Float_t r[3]) const {
  //---------------------------------------------------------------------
  // Returns the position of the track in the global coord. system 
  //---------------------------------------------------------------------
  Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
  r[0]=fX*cs - fP0*sn; r[1]=fX*sn + fP0*cs; r[2]=fP1;
}

#endif
Commit	Line	Data
	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 */
	5
	6	//-------------------------------------------------------------------------
	7	// ITS Track Class
	8	//
	9	// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
	10	// dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
	11	//-------------------------------------------------------------------------
	12
	13
	14	/*****************************************************************************
	15	* December 18, 2000 *
	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	*****************************************************************************/
	27
	28	#include <AliKalmanTrack.h>
	29
	30	#include "AliITSrecoV2.h"
	31
	32	class AliESDtrack;
	33
	34	//_____________________________________________________________________________
	35	class AliITStrackV2 : public AliKalmanTrack {
	36	public:
	37	AliITStrackV2();
	38	AliITStrackV2(AliESDtrack& t,Bool_t c=kFALSE) throw (const Char_t *);
	39	AliITStrackV2(const AliITStrackV2& t);
	40	Int_t PropagateToVertex(Double_t d=0., Double_t x0=0.);
	41	Int_t Propagate(Double_t alpha, Double_t xr);
	42	virtual Int_t CorrectForMaterial(Double_t d, Double_t x0=21.82);
	43	Int_t PropagateTo(Double_t xr, Double_t d, Double_t x0=21.82);
	44	Int_t Update(const AliCluster* cl,Double_t chi2,UInt_t i);
	45	Int_t Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]);
	46	void SetdEdx(Double_t dedx) {fdEdx=dedx;}
	47	void SetSampledEdx(Float_t q, Int_t i);
	48	void CookdEdx(Double_t low=0., Double_t up=0.51);
	49	void SetDetectorIndex(Int_t i) {SetLabel(i);}
	50	void ResetCovariance();
	51	void ResetClusters() { SetChi2(0.); SetNumberOfClusters(0); }
	52	void UpdateESDtrack(ULong_t flags) const;
	53	void SetConstrainedESDtrack(Double_t chi2) const;
	54
	55	AliESDtrack *GetESDtrack() const {return fESDtrack;}
	56
	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();
	69	}
	70	Double_t GetD(Double_t x=0, Double_t y=0) const;
	71	Double_t GetZat(Double_t x=0) const;
	72
	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	Double_t GetPredictedChi2(const AliCluster *cluster) const;
	81	Int_t Invariant() const;
	82
	83	protected:
	84	void GetXYZ(Float_t r[3]) const;
	85
	86	Double_t fX; // X-coordinate of this track (reference plane)
	87	Double_t fAlpha; // rotation angle
	88
	89	Double_t fdEdx; // dE/dx
	90
	91	Double_t fP0; // Y-coordinate of a track
	92	Double_t fP1; // Z-coordinate of a track
	93	Double_t fP2; // sine of the track momentum azimuthal angle
	94	Double_t fP3; // tangent of the track momentum dip angle
	95	Double_t fP4; // track curvature
	96
	97	Double_t fC00; // covariance
	98	Double_t fC10, fC11; // matrix
	99	Double_t fC20, fC21, fC22; // of the
	100	Double_t fC30, fC31, fC32, fC33; // track
	101	Double_t fC40, fC41, fC42, fC43, fC44; // parameters
	102
	103	UInt_t fIndex[kMaxLayer]; // indices of associated clusters
	104	Float_t fdEdxSample[4]; // array of dE/dx samples b.b.
	105
	106	AliESDtrack *fESDtrack; //! pointer to the connected ESD track
	107	ClassDef(AliITStrackV2,4) //ITS reconstructed track
	108	};
	109
	110	inline
	111	void AliITStrackV2::GetExternalParameters(Double_t& xr, Double_t x[5]) const {
	112	//---------------------------------------------------------------------
	113	// This function return external ITS track representation
	114	//---------------------------------------------------------------------
	115	xr=fX;
	116	x[0]=GetY(); x[1]=GetZ(); x[2]=GetSnp(); x[3]=GetTgl(); x[4]=Get1Pt();
	117	}
	118
	119	inline
	120	void AliITStrackV2::SetSampledEdx(Float_t q, Int_t i) {
	121	//----------------------------------------------------------------------
	122	// This function stores dEdx sample corrected for the track segment length
	123	// Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
	124	//----------------------------------------------------------------------
	125	if (i<0) return;
	126	if (i>3) return;
	127	Double_t s=GetSnp(), t=GetTgl();
	128	q = TMath::Sqrt((1-ss)/(1+t*t));
	129	fdEdxSample[i]=q;
	130	}
	131
	132	inline void AliITStrackV2::GetXYZ(Float_t r[3]) const {
	133	//---------------------------------------------------------------------
	134	// Returns the position of the track in the global coord. system
	135	//---------------------------------------------------------------------
	136	Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
	137	r[0]=fXcs - fP0sn; r[1]=fXsn + fP0cs; r[2]=fP1;
	138	}
	139
	140	#endif
	141
	142