MassConstraint.h

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// Class MassConstraint
//
// Author: Jenny Boehme
// Last update: $Date: 2005/01/12 10:11:45 $
//          by: $Author: blist $
// 
// Description: M(p1,p2)=M_W constraint
//               

#ifndef __MASSCONSTRAINT_H
#define __MASSCONSTRAINT_H

#include "jbltools/kinfit/ParticleConstraint.h"

class ParticleFitObject;

class MassConstraint : public ParticleConstraint {
  public:
    MassConstraint (double mass_ = 0.);
    virtual ~MassConstraint();
    virtual double getValue() const;
    virtual void getDerivatives (int idim, double der[]) const;
    virtual double getMass (int flag = 1);
    virtual void setMass (double mass_) {mass = mass_;};
  
  protected:
    double mass;

};

#endif // __MASSCONSTRAINT_H

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