MultiTrackMassKinematicConstraint.h

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#ifndef MultiTrackMassKinematicConstraint_H
#define MultiTrackMassKinematicConstraint_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 MultiTrackMassKinematicConstraint : public MultiTrackKinematicConstraint {
public:
  MultiTrackMassKinematicConstraint(const ParticleMass& theMass, const unsigned int nbrParticles)
      : mass(theMass), nPart(nbrParticles) {}
 
  AlgebraicVector value(const std::vector<KinematicState>& states, const GlobalPoint& point) const override;
 
  AlgebraicMatrix parametersDerivative(const std::vector<KinematicState>& states,
                                       const GlobalPoint& point) const override;
 
  AlgebraicMatrix positionDerivative(const std::vector<KinematicState>& states,
                                     const GlobalPoint& point) const override;
 
  int numberOfEquations() const override { return 1; }
 
  MultiTrackMassKinematicConstraint* clone() const override { return new MultiTrackMassKinematicConstraint(*this); }
 
private:
  const ParticleMass mass;
  const unsigned int nPart;
};
#endif