EvtVectorParticle.hh

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtGen/EvtVectorParticle.hh
//
// Description: Class to describe vector particles.
//
// Modification history:
//
//    DJL/RYD     September 25, 1996         Module created
//
//------------------------------------------------------------------------
 
#ifndef EVTVECTORPARTICLE_HH
#define EVTVECTORPARTICLE_HH
 
#include "EvtGenBase/EvtVector4R.hh"
#include "EvtGenBase/EvtVector4C.hh"
#include "EvtGenBase/EvtParticle.hh"
 
class EvtId;
 
class EvtVectorParticle: public EvtParticle {
 
public:
 
  EvtVectorParticle() {}
  virtual ~EvtVectorParticle();
 
  void init(EvtId part_n,double e,double px,double py,double pz);
  void init(EvtId part_n,const EvtVector4R& p);
  EvtVector4C epsParent(int i) const   {return boostTo(_eps[i],this->getP4());}
  EvtVector4C eps(int i) const {return _eps[i];} 
  EvtSpinDensity rotateToHelicityBasis() const;
  EvtSpinDensity rotateToHelicityBasis(double alpha,
                       double beta,
                       double gamma) const;
 
private:
  
  EvtVector4C _eps[3];
 
  EvtVectorParticle(const EvtVectorParticle& vector);
  EvtVectorParticle& operator=(const EvtVectorParticle& vector);
  
};
 
#endif