MassKinematicConstraint.h

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#ifndef MassKinematicConstraint_H
#define MassKinematicConstraint_H

#include "RecoVertex/KinematicFitPrimitives/interface/KinematicConstraint.h"
#include "RecoVertex/KinematicFitPrimitives/interface/ParticleMass.h"

class MassKinematicConstraint : public KinematicConstraint {
public:
  MassKinematicConstraint(const ParticleMass& m, const float sigma);

  std::pair<AlgebraicVector, AlgebraicVector> value(const AlgebraicVector& exPoint) const override;

  std::pair<AlgebraicMatrix, AlgebraicVector> derivative(const AlgebraicVector& exPoint) const override;

  std::pair<AlgebraicVector, AlgebraicVector> value(const std::vector<RefCountedKinematicParticle>& par) const override;

  std::pair<AlgebraicMatrix, AlgebraicVector> derivative(
      const std::vector<RefCountedKinematicParticle>& par) const override;

  int numberOfEquations() const override;

  AlgebraicVector deviations(int nStates) const override;

  MassKinematicConstraint* clone() const override { return new MassKinematicConstraint(*this); }

private:
  ParticleMass mass;
  AlgebraicVector dd;
};

#endif