/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/PhysicsTools/KinFitter/interface/TFitParticleESpher.h

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#ifndef TFitParticleESpher_hh
#define TFitParticleESpher_hh


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


class TFitParticleESpher: public TAbsFitParticle {

public :

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


private:
  
};

#endif