[u/mrichter/AliRoot.git] / STEER / ESD / AliKFParticleBase.h

//---------------------------------------------------------------------------------
// The AliKFParticleBase class
// .
// @author  S.Gorbunov, I.Kisel, I.Kulakov, M.Zyzak
// @version 1.0
// @since   13.05.07
// 
// Class to reconstruct and store the decayed particle parameters.
// The method is described in CBM-SOFT note 2007-003, 
// ``Reconstruction of decayed particles based on the Kalman filter'', 
// http://www.gsi.de/documents/DOC-2007-May-14-1.pdf
//
// This class describes general mathematics which is used by AliKFParticle class
// 
//  -= Copyright &copy ALICE HLT Group =-
//_________________________________________________________________________________


#ifndef ALIKFPARTICLEBASE_H
#define ALIKFPARTICLEBASE_H

#include "TObject.h"

class AliKFParticleBase :public TObject {
  
 public:

  //*
  //* ABSTRACT METHODS HAVE TO BE DEFINED IN USER CLASS 
  //* 

  //* Virtual method to access the magnetic field

  virtual void GetFieldValue(const Double_t xyz[], Double_t B[]) const = 0;
  
  //* Virtual methods needed for particle transportation 
  //* One can use particular implementations for collider (only Bz component) 
  //* geometry and for fixed-target (CBM-like) geometry which are provided below 
  //* in TRANSPORT section
 
  //* Get dS to xyz[] space point 

  virtual Double_t GetDStoPoint( const Double_t xyz[] ) const = 0;

  //* Get dS to other particle p (dSp for particle p also returned) 

  virtual void GetDStoParticle( const AliKFParticleBase &p, 
				Double_t &DS, Double_t &DSp ) const = 0;
  
  //* Transport on dS value along trajectory, output to P,C

  virtual void Transport( Double_t dS, Double_t P[], Double_t C[] ) const = 0;


  //*
  //*  INITIALIZATION
  //*

  //* Constructor 

  AliKFParticleBase();

  //* Destructor 

  virtual ~AliKFParticleBase() { ; }

 //* Initialisation from "cartesian" coordinates ( X Y Z Px Py Pz )
 //* Parameters, covariance matrix, charge, and mass hypothesis should be provided 

  void Initialize( const Double_t Param[], const Double_t Cov[], Int_t Charge, Double_t Mass );

  //* Initialise covariance matrix and set current parameters to 0.0 

  void Initialize();

  //* Set decay vertex parameters for linearisation 

  void SetVtxGuess( Double_t x, Double_t y, Double_t z );

  //* Set consruction method

  void SetConstructMethod(Int_t m) {fConstructMethod = m;}

  //* Set and get mass hypothesis of the particle
  void SetMassHypo(Double_t m) { fMassHypo = m;}
  const Double_t& GetMassHypo() const { return fMassHypo; }

  //* Returns the sum of masses of the daughters
  const Double_t& GetSumDaughterMass() const {return SumDaughterMass;}

  //*
  //*  ACCESSORS
  //*

  //* Simple accessors 

  Double_t GetX    () const { return fP[0]; }
  Double_t GetY    () const { return fP[1]; }
  Double_t GetZ    () const { return fP[2]; }
  Double_t GetPx   () const { return fP[3]; }
  Double_t GetPy   () const { return fP[4]; }
  Double_t GetPz   () const { return fP[5]; }
  Double_t GetE    () const { return fP[6]; }
  Double_t GetS    () const { return fP[7]; }
  Int_t    GetQ    () const { return fQ;    }
  Double_t GetChi2 () const { return fChi2; }
  Int_t    GetNDF  () const { return fNDF;  }

  const Double_t& X    () const { return fP[0]; }
  const Double_t& Y    () const { return fP[1]; }
  const Double_t& Z    () const { return fP[2]; }
  const Double_t& Px   () const { return fP[3]; }
  const Double_t& Py   () const { return fP[4]; }
  const Double_t& Pz   () const { return fP[5]; }
  const Double_t& E    () const { return fP[6]; }
  const Double_t& S    () const { return fP[7]; }
  const Int_t   & Q    () const { return fQ;    }
  const Double_t& Chi2 () const { return fChi2; }
  const Int_t   & NDF  () const { return fNDF;  }

  
  Double_t GetParameter ( Int_t i )        const { return fP[i];       }
  Double_t GetCovariance( Int_t i )        const { return fC[i];       }
  Double_t GetCovariance( Int_t i, Int_t j ) const { return fC[IJ(i,j)]; }

  //* Accessors with calculations( &value, &estimated sigma )
  //* error flag returned (0 means no error during calculations) 

  Int_t GetMomentum    ( Double_t &P, Double_t &SigmaP ) const ;
  Int_t GetPt          ( Double_t &Pt, Double_t &SigmaPt ) const ;
  Int_t GetEta         ( Double_t &Eta, Double_t &SigmaEta ) const ;
  Int_t GetPhi         ( Double_t &Phi, Double_t &SigmaPhi ) const ;
  Int_t GetMass        ( Double_t &M, Double_t &SigmaM ) const ;
  Int_t GetDecayLength ( Double_t &L, Double_t &SigmaL ) const ;
  Int_t GetDecayLengthXY ( Double_t &L, Double_t &SigmaL ) const ;
  Int_t GetLifeTime    ( Double_t &T, Double_t &SigmaT ) const ;
  Int_t GetR           ( Double_t &R, Double_t &SigmaR ) const ;

  //*
  //*  MODIFIERS
  //*
  
  Double_t & X    () { return fP[0]; }
  Double_t & Y    () { return fP[1]; }
  Double_t & Z    () { return fP[2]; }
  Double_t & Px   () { return fP[3]; }
  Double_t & Py   () { return fP[4]; }
  Double_t & Pz   () { return fP[5]; }
  Double_t & E    () { return fP[6]; }
  Double_t & S    () { return fP[7]; }
  Int_t    & Q    () { return fQ;    }
  Double_t & Chi2 () { return fChi2; }
  Int_t    & NDF  () { return fNDF;  }

  
  Double_t & Parameter ( Int_t i )        { return fP[i];       }
  Double_t & Covariance( Int_t i )        { return fC[i];       }
  Double_t & Covariance( Int_t i, Int_t j ) { return fC[IJ(i,j)]; }


  //* 
  //* CONSTRUCTION OF THE PARTICLE BY ITS DAUGHTERS AND MOTHER
  //* USING THE KALMAN FILTER METHOD
  //*


  //* Simple way to add daughter ex. D0+= Pion; 

  void operator +=( const AliKFParticleBase &Daughter );  

  //* Add daughter track to the particle 

  void AddDaughter( const AliKFParticleBase &Daughter );

  void AddDaughterWithEnergyFit( const AliKFParticleBase &Daughter );
  void AddDaughterWithEnergyCalc( const AliKFParticleBase &Daughter );
  void AddDaughterWithEnergyFitMC( const AliKFParticleBase &Daughter ); //with mass constrained

  //* Set production vertex 

  void SetProductionVertex( const AliKFParticleBase &Vtx );

  //* Set mass constraint 

  void SetNonlinearMassConstraint( Double_t Mass );
  void SetMassConstraint( Double_t Mass, Double_t SigmaMass = 0 );
  
  //* Set no decay length for resonances

  void SetNoDecayLength();


  //* Everything in one go  

  void Construct( const AliKFParticleBase *vDaughters[], Int_t NDaughters, 
		  const AliKFParticleBase *ProdVtx=0,   Double_t Mass=-1, Bool_t IsConstrained=0  );


  //*
  //*                   TRANSPORT
  //* 
  //*  ( main transportation parameter is S = SignedPath/Momentum )
  //*  ( parameters of decay & production vertices are stored locally )
  //*


  //* Transport the particle to its decay vertex 

  void TransportToDecayVertex();

  //* Transport the particle to its production vertex 

  void TransportToProductionVertex();

  //* Transport the particle on dS parameter (SignedPath/Momentum) 

  void TransportToDS( Double_t dS );

  //* Particular extrapolators one can use 

  Double_t GetDStoPointBz( Double_t Bz, const Double_t xyz[] ) const;
  
  void GetDStoParticleBz( Double_t Bz, const AliKFParticleBase &p, 
			  Double_t &dS, Double_t &dS1       ) const ;
 
  // Double_t GetDStoPointCBM( const Double_t xyz[] ) const;
 
   void TransportBz( Double_t Bz, Double_t dS, Double_t P[], Double_t C[] ) const;
   void TransportCBM( Double_t dS, Double_t P[], Double_t C[] ) const;  


  //* 
  //* OTHER UTILITIES
  //*

  //* Calculate distance from another object [cm]

  Double_t GetDistanceFromVertex( const Double_t vtx[] ) const;
  Double_t GetDistanceFromVertex( const AliKFParticleBase &Vtx ) const;
  Double_t GetDistanceFromParticle( const AliKFParticleBase &p ) const;

  //* Calculate sqrt(Chi2/ndf) deviation from vertex
  //* v = [xyz], Cv=[Cxx,Cxy,Cyy,Cxz,Cyz,Czz]-covariance matrix

  Double_t GetDeviationFromVertex( const Double_t v[], 
				   const Double_t Cv[]=0 ) const;
  Double_t GetDeviationFromVertex( const AliKFParticleBase &Vtx ) const;
  Double_t GetDeviationFromParticle( const AliKFParticleBase &p ) const;  

  //* Subtract the particle from the vertex  

  void SubtractFromVertex( AliKFParticleBase &Vtx ) const;

  //* Special method for creating gammas

  void ConstructGammaBz( const AliKFParticleBase &daughter1,
			 const AliKFParticleBase &daughter2, double Bz  );

  //* return parameters for the Armenteros-Podolanski plot
  static void GetArmenterosPodolanski(AliKFParticleBase& positive, AliKFParticleBase& negative, Double_t QtAlfa[2] );

  //* Rotates the KFParticle object around OZ axis, OZ axis is set by the vertex position
  void RotateXY(Double_t angle, Double_t Vtx[3]);

 protected:

  static Int_t IJ( Int_t i, Int_t j ){ 
    return ( j<=i ) ? i*(i+1)/2+j :j*(j+1)/2+i;
  }

  Double_t & Cij( Int_t i, Int_t j ){ return fC[IJ(i,j)]; }

  void Convert( bool ToProduction );
  void TransportLine( Double_t S, Double_t P[], Double_t C[] ) const ;
  Double_t GetDStoPointLine( const Double_t xyz[] ) const;

  static Bool_t InvertSym3( const Double_t A[], Double_t Ainv[] );

  static void MultQSQt( const Double_t Q[], const Double_t S[], 
			Double_t SOut[] );

  static Double_t GetSCorrection( const Double_t Part[], const Double_t XYZ[] );

  void GetMeasurement( const Double_t XYZ[], Double_t m[], Double_t V[] ) const ;

  //* Mass constraint function. is needed for the nonlinear mass constraint and a fit with mass constraint
  void SetMassConstraint( Double_t *mP, Double_t *mC, Double_t mJ[7][7], Double_t mass );

  Double_t fP[8];  //* Main particle parameters {X,Y,Z,Px,Py,Pz,E,S[=DecayLength/P]}
  Double_t fC[36]; //* Low-triangle covariance matrix of fP
  Int_t    fQ;     //* Particle charge 
  Int_t    fNDF;   //* Number of degrees of freedom 
  Double_t fChi2;  //* Chi^2

  Double_t fSFromDecay; //* Distance from decay vertex to current position

  Bool_t fAtProductionVertex; //* Flag shows that the particle error along
                              //* its trajectory is taken from production vertex    

  Double_t fVtxGuess[3];  //* Guess for the position of the decay vertex 
                          //* ( used for linearisation of equations )

  Bool_t fIsLinearized;   //* Flag shows that the guess is present

  Int_t fConstructMethod; //* Determines the method for the particle construction. 
  //* 0 - Energy considered as an independent veriable, fitted independently from momentum, without any constraints on mass
  //* 1 - Energy considered as a dependent variable, calculated from the momentum and mass hypothesis
  //* 2 - Energy considered as an independent variable, fitted independently from momentum, with constraints on mass of daughter particle

  Double_t SumDaughterMass;  //* sum of the daughter particles masses
  Double_t fMassHypo;  //* sum of the daughter particles masses

  ClassDef( AliKFParticleBase, 2);
};

#endif
Commit	Line	Data
f826d409	1	//---------------------------------------------------------------------------------
	2	// The AliKFParticleBase class
	3	// .
57ddc2cb	4	// @author S.Gorbunov, I.Kisel, I.Kulakov, M.Zyzak
f826d409	5	// @version 1.0
	6	// @since 13.05.07
	7	//
	8	// Class to reconstruct and store the decayed particle parameters.
	9	// The method is described in CBM-SOFT note 2007-003,
	10	// ``Reconstruction of decayed particles based on the Kalman filter'',
	11	// http://www.gsi.de/documents/DOC-2007-May-14-1.pdf
	12	//
	13	// This class describes general mathematics which is used by AliKFParticle class
	14	//
	15	// -= Copyright &copy ALICE HLT Group =-
	16	//_________________________________________________________________________________
	17
	18
	19
	20	#ifndef ALIKFPARTICLEBASE_H
	21	#define ALIKFPARTICLEBASE_H
	22
	23	#include "TObject.h"
	24
	25	class AliKFParticleBase :public TObject {
	26
	27	public:
	28
	29	//*
	30	//* ABSTRACT METHODS HAVE TO BE DEFINED IN USER CLASS
	31	//*
	32
	33	//* Virtual method to access the magnetic field
	34
	35	virtual void GetFieldValue(const Double_t xyz[], Double_t B[]) const = 0;
	36
	37	//* Virtual methods needed for particle transportation
	38	//* One can use particular implementations for collider (only Bz component)
	39	//* geometry and for fixed-target (CBM-like) geometry which are provided below
	40	//* in TRANSPORT section
	41
	42	//* Get dS to xyz[] space point
	43
	44	virtual Double_t GetDStoPoint( const Double_t xyz[] ) const = 0;
	45
	46	//* Get dS to other particle p (dSp for particle p also returned)
	47
	48	virtual void GetDStoParticle( const AliKFParticleBase &p,
	49	Double_t &DS, Double_t &DSp ) const = 0;
	50
	51	//* Transport on dS value along trajectory, output to P,C
	52
	53	virtual void Transport( Double_t dS, Double_t P[], Double_t C[] ) const = 0;
	54
	55
	56
	57	//*
	58	//* INITIALIZATION
	59	//*
	60
	61	//* Constructor
	62
	63	AliKFParticleBase();
	64
	65	//* Destructor
	66
e7b09c95	67	virtual ~AliKFParticleBase() { ; }
	68
	69	//* Initialisation from "cartesian" coordinates ( X Y Z Px Py Pz )
	70	//* Parameters, covariance matrix, charge, and mass hypothesis should be provided
	71
	72	void Initialize( const Double_t Param[], const Double_t Cov[], Int_t Charge, Double_t Mass );
f826d409	73
	74	//* Initialise covariance matrix and set current parameters to 0.0
	75
	76	void Initialize();
	77
	78	//* Set decay vertex parameters for linearisation
	79
	80	void SetVtxGuess( Double_t x, Double_t y, Double_t z );
	81
57ddc2cb	82	//* Set consruction method
	83
	84	void SetConstructMethod(Int_t m) {fConstructMethod = m;}
	85
	86	//* Set and get mass hypothesis of the particle
	87	void SetMassHypo(Double_t m) { fMassHypo = m;}
	88	const Double_t& GetMassHypo() const { return fMassHypo; }
	89
	90	//* Returns the sum of masses of the daughters
	91	const Double_t& GetSumDaughterMass() const {return SumDaughterMass;}
	92
f826d409	93	//*
	94	//* ACCESSORS
	95	//*
	96
	97	//* Simple accessors
	98
	99	Double_t GetX () const { return fP[0]; }
	100	Double_t GetY () const { return fP[1]; }
	101	Double_t GetZ () const { return fP[2]; }
	102	Double_t GetPx () const { return fP[3]; }
	103	Double_t GetPy () const { return fP[4]; }
	104	Double_t GetPz () const { return fP[5]; }
	105	Double_t GetE () const { return fP[6]; }
	106	Double_t GetS () const { return fP[7]; }
	107	Int_t GetQ () const { return fQ; }
	108	Double_t GetChi2 () const { return fChi2; }
	109	Int_t GetNDF () const { return fNDF; }
91b25235	110
	111	const Double_t& X () const { return fP[0]; }
	112	const Double_t& Y () const { return fP[1]; }
	113	const Double_t& Z () const { return fP[2]; }
	114	const Double_t& Px () const { return fP[3]; }
	115	const Double_t& Py () const { return fP[4]; }
	116	const Double_t& Pz () const { return fP[5]; }
	117	const Double_t& E () const { return fP[6]; }
	118	const Double_t& S () const { return fP[7]; }
	119	const Int_t & Q () const { return fQ; }
	120	const Double_t& Chi2 () const { return fChi2; }
	121	const Int_t & NDF () const { return fNDF; }
	122
f826d409	123
	124	Double_t GetParameter ( Int_t i ) const { return fP[i]; }
	125	Double_t GetCovariance( Int_t i ) const { return fC[i]; }
	126	Double_t GetCovariance( Int_t i, Int_t j ) const { return fC[IJ(i,j)]; }
	127
	128	//* Accessors with calculations( &value, &estimated sigma )
	129	//* error flag returned (0 means no error during calculations)
	130
706952f5	131	Int_t GetMomentum ( Double_t &P, Double_t &SigmaP ) const ;
	132	Int_t GetPt ( Double_t &Pt, Double_t &SigmaPt ) const ;
	133	Int_t GetEta ( Double_t &Eta, Double_t &SigmaEta ) const ;
	134	Int_t GetPhi ( Double_t &Phi, Double_t &SigmaPhi ) const ;
	135	Int_t GetMass ( Double_t &M, Double_t &SigmaM ) const ;
	136	Int_t GetDecayLength ( Double_t &L, Double_t &SigmaL ) const ;
446ce366	137	Int_t GetDecayLengthXY ( Double_t &L, Double_t &SigmaL ) const ;
706952f5	138	Int_t GetLifeTime ( Double_t &T, Double_t &SigmaT ) const ;
706952f5	139	Int_t GetR ( Double_t &R, Double_t &SigmaR ) const ;
f826d409	140
	141	//*
	142	//* MODIFIERS
	143	//*
	144
	145	Double_t & X () { return fP[0]; }
	146	Double_t & Y () { return fP[1]; }
	147	Double_t & Z () { return fP[2]; }
	148	Double_t & Px () { return fP[3]; }
	149	Double_t & Py () { return fP[4]; }
	150	Double_t & Pz () { return fP[5]; }
	151	Double_t & E () { return fP[6]; }
	152	Double_t & S () { return fP[7]; }
	153	Int_t & Q () { return fQ; }
	154	Double_t & Chi2 () { return fChi2; }
	155	Int_t & NDF () { return fNDF; }
	156
91b25235	157
91b25235	158
f826d409	159	Double_t & Parameter ( Int_t i ) { return fP[i]; }
	160	Double_t & Covariance( Int_t i ) { return fC[i]; }
	161	Double_t & Covariance( Int_t i, Int_t j ) { return fC[IJ(i,j)]; }
	162
	163
	164	//*
	165	//* CONSTRUCTION OF THE PARTICLE BY ITS DAUGHTERS AND MOTHER
	166	//* USING THE KALMAN FILTER METHOD
	167	//*
	168
	169
	170	//* Simple way to add daughter ex. D0+= Pion;
	171
	172	void operator +=( const AliKFParticleBase &Daughter );
	173
	174	//* Add daughter track to the particle
	175
	176	void AddDaughter( const AliKFParticleBase &Daughter );
	177
57ddc2cb	178	void AddDaughterWithEnergyFit( const AliKFParticleBase &Daughter );
	179	void AddDaughterWithEnergyCalc( const AliKFParticleBase &Daughter );
	180	void AddDaughterWithEnergyFitMC( const AliKFParticleBase &Daughter ); //with mass constrained
	181
f826d409	182	//* Set production vertex
	183
	184	void SetProductionVertex( const AliKFParticleBase &Vtx );
	185
e7b09c95	186	//* Set mass constraint
f826d409	187
57ddc2cb	188	void SetNonlinearMassConstraint( Double_t Mass );
e7b09c95	189	void SetMassConstraint( Double_t Mass, Double_t SigmaMass = 0 );
f826d409	190
e7b09c95	191	//* Set no decay length for resonances
	192
	193	void SetNoDecayLength();
	194
	195
f826d409	196	//* Everything in one go
	197
	198	void Construct( const AliKFParticleBase *vDaughters[], Int_t NDaughters,
706952f5	199	const AliKFParticleBase *ProdVtx=0, Double_t Mass=-1, Bool_t IsConstrained=0 );
f826d409	200
	201
	202	//*
	203	//* TRANSPORT
	204	//*
	205	//* ( main transportation parameter is S = SignedPath/Momentum )
	206	//* ( parameters of decay & production vertices are stored locally )
	207	//*
	208
	209
	210	//* Transport the particle to its decay vertex
	211
	212	void TransportToDecayVertex();
	213
	214	//* Transport the particle to its production vertex
	215
	216	void TransportToProductionVertex();
	217
	218	//* Transport the particle on dS parameter (SignedPath/Momentum)
	219
	220	void TransportToDS( Double_t dS );
	221
	222	//* Particular extrapolators one can use
	223
	224	Double_t GetDStoPointBz( Double_t Bz, const Double_t xyz[] ) const;
	225
	226	void GetDStoParticleBz( Double_t Bz, const AliKFParticleBase &p,
	227	Double_t &dS, Double_t &dS1 ) const ;
	228
	229	// Double_t GetDStoPointCBM( const Double_t xyz[] ) const;
	230
	231	void TransportBz( Double_t Bz, Double_t dS, Double_t P[], Double_t C[] ) const;
	232	void TransportCBM( Double_t dS, Double_t P[], Double_t C[] ) const;
	233
	234
	235	//*
	236	//* OTHER UTILITIES
	237	//*
	238
	239	//* Calculate distance from another object [cm]
	240
	241	Double_t GetDistanceFromVertex( const Double_t vtx[] ) const;
	242	Double_t GetDistanceFromVertex( const AliKFParticleBase &Vtx ) const;
616ffc76	243	Double_t GetDistanceFromParticle( const AliKFParticleBase &p ) const;
f826d409	244
	245	//* Calculate sqrt(Chi2/ndf) deviation from vertex
	246	//* v = [xyz], Cv=[Cxx,Cxy,Cyy,Cxz,Cyz,Czz]-covariance matrix
	247
	248	Double_t GetDeviationFromVertex( const Double_t v[],
	249	const Double_t Cv[]=0 ) const;
	250	Double_t GetDeviationFromVertex( const AliKFParticleBase &Vtx ) const;
616ffc76	251	Double_t GetDeviationFromParticle( const AliKFParticleBase &p ) const;
f826d409	252
	253	//* Subtract the particle from the vertex
	254
de0d0ceb	255	void SubtractFromVertex( AliKFParticleBase &Vtx ) const;
de0d0ceb	256
a65041d0	257	//* Special method for creating gammas
	258
	259	void ConstructGammaBz( const AliKFParticleBase &daughter1,
	260	const AliKFParticleBase &daughter2, double Bz );
	261
24be0330	262	//* return parameters for the Armenteros-Podolanski plot
	263	static void GetArmenterosPodolanski(AliKFParticleBase& positive, AliKFParticleBase& negative, Double_t QtAlfa[2] );
	264
	265	//* Rotates the KFParticle object around OZ axis, OZ axis is set by the vertex position
	266	void RotateXY(Double_t angle, Double_t Vtx[3]);
	267
f826d409	268	protected:
	269
	270	static Int_t IJ( Int_t i, Int_t j ){
	271	return ( j<=i ) ? i(i+1)/2+j :j(j+1)/2+i;
	272	}
	273
	274	Double_t & Cij( Int_t i, Int_t j ){ return fC[IJ(i,j)]; }
	275
	276	void Convert( bool ToProduction );
	277	void TransportLine( Double_t S, Double_t P[], Double_t C[] ) const ;
	278	Double_t GetDStoPointLine( const Double_t xyz[] ) const;
	279
a65041d0	280	static Bool_t InvertSym3( const Double_t A[], Double_t Ainv[] );
a65041d0	281
f826d409	282	static void MultQSQt( const Double_t Q[], const Double_t S[],
	283	Double_t SOut[] );
	284
706952f5	285	static Double_t GetSCorrection( const Double_t Part[], const Double_t XYZ[] );
706952f5	286
616ffc76	287	void GetMeasurement( const Double_t XYZ[], Double_t m[], Double_t V[] ) const ;
f826d409	288
57ddc2cb	289	//* Mass constraint function. is needed for the nonlinear mass constraint and a fit with mass constraint
5f653c6e	290	void SetMassConstraint( Double_t mP, Double_t mC, Double_t mJ[7][7], Double_t mass );
57ddc2cb	291
f826d409	292	Double_t fP[8]; //* Main particle parameters {X,Y,Z,Px,Py,Pz,E,S[=DecayLength/P]}
	293	Double_t fC[36]; //* Low-triangle covariance matrix of fP
	294	Int_t fQ; //* Particle charge
	295	Int_t fNDF; //* Number of degrees of freedom
	296	Double_t fChi2; //* Chi^2
	297
	298	Double_t fSFromDecay; //* Distance from decay vertex to current position
	299
	300	Bool_t fAtProductionVertex; //* Flag shows that the particle error along
	301	//* its trajectory is taken from production vertex
	302
	303	Double_t fVtxGuess[3]; //* Guess for the position of the decay vertex
	304	//* ( used for linearisation of equations )
	305
	306	Bool_t fIsLinearized; //* Flag shows that the guess is present
	307
5f653c6e	308	Int_t fConstructMethod; //* Determines the method for the particle construction.
57ddc2cb	309	//* 0 - Energy considered as an independent veriable, fitted independently from momentum, without any constraints on mass
	310	//* 1 - Energy considered as a dependent variable, calculated from the momentum and mass hypothesis
	311	//* 2 - Energy considered as an independent variable, fitted independently from momentum, with constraints on mass of daughter particle
57ddc2cb	312
	313	Double_t SumDaughterMass; //* sum of the daughter particles masses
	314	Double_t fMassHypo; //* sum of the daughter particles masses
	315
c61239f8	316	ClassDef( AliKFParticleBase, 2);
f826d409	317	};
	318
	319	#endif