/data/refman/pasoursint/CMSSW_5_3_0/src/PhysicsTools/KinFitter/interface/TFitParticleMCSpher.h

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#ifndef TFitParticleMCSpher_hh
#define TFitParticleMCSpher_hh

#include "TMatrixD.h"
#include "PhysicsTools/KinFitter/interface/TAbsFitParticle.h"
#include "TLorentzVector.h"
#include "TVector3.h"

class TFitParticleMCSpher: public TAbsFitParticle {

public :

  TFitParticleMCSpher();
  TFitParticleMCSpher( const TFitParticleMCSpher& fitParticle );
  TFitParticleMCSpher(TVector3* p, Double_t M, const TMatrixD* theCovMatrix);
  TFitParticleMCSpher(const TString &name, const TString &title, 
                 TVector3* p, Double_t M, const TMatrixD* theCovMatrix);
  virtual ~TFitParticleMCSpher();
  virtual TAbsFitParticle* clone( TString newname = "" ) const;

  // returns derivative dP/dy with P=(p,E) and y=(r, theta, phi, ...) 
  // the free parameters of the fit. The columns of the matrix contain 
  // (dP/dr, dP/dtheta, ...).
  virtual TMatrixD* getDerivative();
  virtual TMatrixD* transform(const TLorentzVector& vec);
  virtual void setIni4Vec(const TLorentzVector* pini);
  void setIni4Vec(const TVector3* p, Double_t M);
  virtual TLorentzVector* calc4Vec( const TMatrixD* params );

protected :

  void init(TVector3* p, Double_t M, const TMatrixD* theCovMatrix);

  
private:
};

#endif