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 "EvtParticle.hh"
#include "EvtVector4C.hh"
#include "EvtVector4R.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