FFVVertex.h

// -*- C++ -*-
//
// FFVVertex.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_FFVVertex_H
#define ThePEG_FFVVertex_H
//
// This is the declaration of the FFVVertex class.

#include <ThePEG/Helicity/Vertex/AbstractFFVVertex.h>
#include <ThePEG/Helicity/WaveFunction/VectorWaveFunction.h>
#include <ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h>
#include <ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h>
#include "FFVVertex.fh"

namespace ThePEG {

namespace Helicity{

class FFVVertex: public AbstractFFVVertex {
  
public:
  
  static void Init();
  
public:

  Complex evaluate(Energy2 q2,const SpinorWaveFunction & sp1,
                   const SpinorBarWaveFunction & sbar2,const VectorWaveFunction & vec3);

  SpinorBarWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                                 const SpinorBarWaveFunction & sbar2,
                                 const VectorWaveFunction & vec3,
                                 Energy mass=-GeV, Energy width=-GeV);

  VectorWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                              const SpinorWaveFunction & sp1,
                              const SpinorBarWaveFunction & sbar2,
                              Energy mass=-GeV, Energy width=-GeV);

  SpinorWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                              const SpinorWaveFunction & sp1,
                              const VectorWaveFunction & vec3,
                              Energy mass=-GeV, Energy width=-GeV);

  virtual SpinorWaveFunction evaluateSmall(Energy2 q2,int iopt, tcPDPtr out,
                                           const SpinorWaveFunction & sp1,
                                           const VectorWaveFunction & vec3,
                                           unsigned int fhel, unsigned int vhel,
                                           double ctheta, double phi, double stheta,
                                           bool includeEikonal = true,
                                           SmallAngleDirection direction = PostiveZDirection,
                                           Energy mass=-GeV, Energy width=-GeV);

  virtual SpinorBarWaveFunction evaluateSmall(Energy2 q2,int iopt, tcPDPtr out,
                                              const SpinorBarWaveFunction & sbar2,
                                              const VectorWaveFunction & vec3,
                                              unsigned int fhel, unsigned int vhel,
                                              double ctheta, double phi, double stheta,
                                              bool includeEikonal = true,
                                              SmallAngleDirection direction = PostiveZDirection,
                                              Energy mass=-GeV, Energy width=-GeV);

  virtual void setCoupling(Energy2 q2,tcPDPtr part1,tcPDPtr part2,tcPDPtr part3)=0;

  const Complex & left() { return _left; }

  const Complex & right() { return _right; }

protected:

  void left(const Complex & in) { _left = in; }

  void right(const Complex & in) { _right = in; }

private:
  
  static AbstractNoPIOClassDescription<FFVVertex> initFFVVertex;
  
  FFVVertex & operator=(const FFVVertex &);
  
private:

  Complex _left;

  Complex _right;
  
};
}

template <>
struct BaseClassTrait<ThePEG::Helicity::FFVVertex,1> {
  typedef ThePEG::Helicity::AbstractFFVVertex NthBase;
};

template <>
struct ClassTraits<ThePEG::Helicity::FFVVertex>
  : public ClassTraitsBase<ThePEG::Helicity::FFVVertex> {

  static string className() { return "ThePEG::FFVVertex"; }
};

}


#endif /* ThePEG_FFVVertex_H */

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