BesEvtGen-00-04-08/src/EvtGen/EvtGenBase/EvtDiracParticle.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/EvtDiracParticle.hh
//
// Description:EvtDiracParticle particles i.e. spin 1/2 particles.
//
// Modification history:
//
//    DJL/RYD     September 25, 1996         Module created
//
//------------------------------------------------------------------------
 
#ifndef EVTDIRACPARTICLE_HH
#define EVTDIRACPARTICLE_HH
 
#include "EvtGenBase/EvtDiracSpinor.hh"
#include "EvtGenBase/EvtParticle.hh"
//#include "EvtGenBase/EvtId.hh"
 
class EvtId;
class EvtVector4R;
 
class EvtDiracParticle:public EvtParticle {
 
public:
 
  
  EvtDiracParticle();
  virtual ~EvtDiracParticle();
  void init(EvtId part_n,const EvtVector4R& p4);
  EvtDiracSpinor spParent(int i) const {return _spinorParent[i];}
  EvtDiracSpinor sp(int i) const {return _spinorRest[i];}  
  EvtSpinDensity rotateToHelicityBasis() const;
  EvtSpinDensity rotateToHelicityBasis(double alpha,
                       double beta,
                       double gamma) const;
 
private:
 
  EvtDiracSpinor _spinorRest[2];
  EvtDiracSpinor _spinorParent[2];
  EvtDiracParticle(const EvtDiracParticle& d);
  EvtDiracParticle& operator=(const EvtDiracParticle& d);
 
};
#endif