RSFermionSpinInfo.h

// -*- C++ -*-
//
// RSFermionSpinInfo.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 2003-2019 Peter Richardson, Leif Lonnblad
//
// ThePEG is licenced under version 3 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 "ThePEG/EventRecord/SpinInfo.h"
#include "ThePEG/Helicity/LorentzRSSpinor.h"
#include "RSFermionSpinInfo.fh"
#include <array>

namespace ThePEG {
namespace Helicity {

class RSFermionSpinInfo: public SpinInfo {

public:

  RSFermionSpinInfo()  : SpinInfo(PDT::Spin3Half), _decaycalc(false) {}

  RSFermionSpinInfo(const Lorentz5Momentum & p,bool time)
    : SpinInfo(PDT::Spin3Half, p, time), _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> & getCurrentBasisState(unsigned int hel) const {
    assert(hel<4);
    return _currentstates[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 &);

  virtual void undecay() const {
    _decaycalc=false;
    SpinInfo::undecay();
  }

  virtual void reset() {
    undecay();
    _currentstates = _productionstates;
    SpinInfo::reset();
  }

public:

  static void Init();

  virtual EIPtr clone() const;

private:

  RSFermionSpinInfo & operator=(const RSFermionSpinInfo &) = delete;

private:

  mutable std::array<LorentzRSSpinor<SqrtEnergy>,4> _productionstates;

  mutable std::array<LorentzRSSpinor<SqrtEnergy>,4> _decaystates;

  mutable std::array<LorentzRSSpinor<SqrtEnergy>,4> _currentstates;

  mutable bool _decaycalc;

};

}
}



namespace ThePEG {

}
#endif /* THEPEG_RSFermionSpinInfo_H */