/data/refman/pasoursint/CMSSW_4_4_5_patch3/src/PhysicsTools/KinFitter/interface/TFitParticleEScaledMomDev.h

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#ifndef TFitParticleEScaledMomDev_hh
#define TFitParticleEScaledMomDev_hh

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


class TFitParticleEScaledMomDev: public TAbsFitParticle {

public :

  TFitParticleEScaledMomDev();
  TFitParticleEScaledMomDev( const TFitParticleEScaledMomDev& fitParticle );
  TFitParticleEScaledMomDev(TLorentzVector* pini, const TMatrixD* theCovMatrix);
  TFitParticleEScaledMomDev(const TString &name, const TString &title,
                      TLorentzVector* pini, const TMatrixD* theCovMatrix);
  virtual ~TFitParticleEScaledMomDev();
  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);
  virtual TLorentzVector* calc4Vec( const TMatrixD* params );

protected :

  void init(TLorentzVector* pini, const TMatrixD* theCovMatrix);

};

#endif