AbstractFFVVertex.h

// -*- C++ -*-
#ifndef HELICITY_AbstractFFVVertex_H
#define HELICITY_AbstractFFVVertex_H
//
// This is the declaration of the AbstractFFVVertex class.
//

#include "VertexBase.h"
#include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
#include "AbstractFFVVertex.fh"

namespace ThePEG {
namespace Helicity {

class AbstractFFVVertex: public VertexBase {

public:

  enum SmallAngleDirection {
    NegativeZDirection = -1, 
    PostiveZDirection  =  1  
  };
  
public:


  AbstractFFVVertex() : VertexBase(VertexType::FFV) {}

  virtual Complex evaluate(Energy2 q2,const SpinorWaveFunction & sp1,
                           const SpinorBarWaveFunction & sbar2,
                           const VectorWaveFunction & vec3) = 0;

  virtual SpinorBarWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                                         const SpinorBarWaveFunction & sbar2,
                                         const VectorWaveFunction & vec3,
                                         Energy mass=-GeV, Energy width=-GeV) = 0;

  virtual VectorWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                                      const SpinorWaveFunction & sp1,
                                      const SpinorBarWaveFunction & sbar2,
                                      Energy mass=-GeV, Energy width=-GeV) = 0;

  virtual SpinorWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                                      const SpinorWaveFunction & sp1,
                                      const VectorWaveFunction & vec3,
                                      Energy mass=-GeV, Energy width=-GeV) = 0;

  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);

public:

  static void Init();

private:

  static AbstractNoPIOClassDescription<AbstractFFVVertex> initAbstractFFVVertex;

  AbstractFFVVertex & operator=(const AbstractFFVVertex &);

};

}
}

#include "ThePEG/Utilities/ClassTraits.h"

namespace ThePEG {

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

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

}

#endif /* HELICITY_AbstractFFVVertex_H */

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