/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/RecoVertex/KinematicFit/interface/TwoTrackMassKinematicConstraint.h

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#ifndef TwoTrackMassKinematicConstraint_H
#define TwoTrackMassKinematicConstraint_H

#include "RecoVertex/KinematicFitPrimitives/interface/MultiTrackKinematicConstraint.h"
#include "RecoVertex/KinematicFitPrimitives/interface/KinematicState.h"
#include "DataFormats/CLHEP/interface/AlgebraicObjects.h"
#include "RecoVertex/KinematicFitPrimitives/interface/ParticleMass.h"

class TwoTrackMassKinematicConstraint : public MultiTrackKinematicConstraint{

public:
 TwoTrackMassKinematicConstraint(ParticleMass& ms):mass(ms)
 {}


virtual AlgebraicVector  value(const std::vector<KinematicState> states,
                        const GlobalPoint& point) const;


virtual AlgebraicMatrix parametersDerivative(const std::vector<KinematicState> states,
                                      const GlobalPoint& point) const;

virtual AlgebraicMatrix positionDerivative(const std::vector<KinematicState> states,
                                    const GlobalPoint& point) const;

virtual int numberOfEquations() const;
 
virtual TwoTrackMassKinematicConstraint * clone()const
{return new TwoTrackMassKinematicConstraint(*this);}

private:

 ParticleMass mass;

};
#endif