//--------------------------------------------------------------------------
//
// 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/EvtNeutrinoParticle.hh
//
// Description:Class to describe neutrinos
//
// Modification history:
//
//    RYD     September 25, 1996         Module created
//
//------------------------------------------------------------------------

#ifndef EVTNEUTRINOPARTICLE_HH
#define EVTNEUTRINOPARTICLE_HH

#include "EvtGenBase/EvtDiracSpinor.hh"
#include "EvtGenBase/EvtParticle.hh"
class EvtId;
class EvtVector4R;

class EvtNeutrinoParticle:public EvtParticle {

public:

  EvtNeutrinoParticle();
  virtual ~EvtNeutrinoParticle();
  void init(EvtId part_n,const EvtVector4R& p4);
  EvtDiracSpinor spParentNeutrino() const;
  EvtDiracSpinor spNeutrino() const;
  EvtSpinDensity rotateToHelicityBasis() const;
  EvtSpinDensity rotateToHelicityBasis(double alpha,
				       double beta,
				       double gamma) const;
  
private:

  EvtDiracSpinor spinor_rest;
  EvtDiracSpinor spinor_parent;

  EvtNeutrinoParticle(const EvtNeutrinoParticle& n);
  EvtNeutrinoParticle& operator=(const EvtNeutrinoParticle& n);

};
#endif