RSFermionSpinInfo.h

// -*- C++ -*-
//
// RSFermionSpinInfo.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 2003-2007 Peter Richardson, Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef THEPEG_RSFermionSpinInfo_H
#define THEPEG_RSFermionSpinInfo_H
// This is the declaration of the RSFermionSpinInfo class.

#include "SpinInfo.h"
#include "ThePEG/Helicity/LorentzRSSpinor.h"
#include "RSFermionSpinInfo.fh"

namespace ThePEG {
namespace Helicity {

class RSFermionSpinInfo: public SpinInfo {

public:

  RSFermionSpinInfo()  : SpinInfo(PDT::Spin3Half), _productionstates(4),
                         _decaystates(4), _currentstates(4), 
                         _decaycalc(false) {}

  RSFermionSpinInfo(const Lorentz5Momentum & p,bool time)
    : SpinInfo(PDT::Spin3Half, p, time),
      _productionstates(4), _decaystates(4), _currentstates(4), 
      _decaycalc(false) {}

public:

  void setBasisState(unsigned int hel,
                     const LorentzRSSpinor<SqrtEnergy> & in) const {
    assert(hel<4);
    _productionstates[hel] = in;
    _currentstates   [hel] = in;
  }

  void setDecayState(unsigned int hel,
                     const LorentzRSSpinor<SqrtEnergy> & in) const {
    assert(hel<4);
    _decaycalc = true;
    _decaystates[hel] = in;
  }

  const LorentzRSSpinor<SqrtEnergy> & getProductionBasisState(unsigned int hel) const {
    assert(hel<4);
    return _productionstates[hel];
  }

  const LorentzRSSpinor<SqrtEnergy> & getDecayBasisState(unsigned int hel) const {
    assert(hel<4);
    if(!_decaycalc) {
      for(unsigned int ix=0;ix<4;++ix) _decaystates[ix]=_currentstates[ix];
      _decaycalc=true;
    }
    return _decaystates[hel];
  }

  virtual void transform(const LorentzMomentum &,const LorentzRotation &);

public:

  static void Init();

  virtual EIPtr clone() const;

private:

  static NoPIOClassDescription<RSFermionSpinInfo> initRSFermionSpinInfo;

  RSFermionSpinInfo & operator=(const RSFermionSpinInfo &);

private:

  mutable vector<LorentzRSSpinor<SqrtEnergy> > _productionstates;

  mutable vector<LorentzRSSpinor<SqrtEnergy> > _decaystates;

  mutable vector<LorentzRSSpinor<SqrtEnergy> > _currentstates;

  mutable bool _decaycalc;

};

}
}


#include "ThePEG/Utilities/ClassTraits.h"

namespace ThePEG {

template <>
struct BaseClassTrait<ThePEG::Helicity::RSFermionSpinInfo,1> {
  typedef ThePEG::Helicity::SpinInfo NthBase;
};

template <>
struct ClassTraits<ThePEG::Helicity::RSFermionSpinInfo>
  : public ClassTraitsBase<ThePEG::Helicity::RSFermionSpinInfo> {
  static string className() { return "ThePEG::Helicity::RSFermionSpinInfo"; }
};

}

#endif /* THEPEG_RSFermionSpinInfo_H */

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