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 // -*- C++ -*-
 //
 // GeneralFFVVertex.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_GeneralFFVVertex_H
 #define ThePEG_GeneralFFVVertex_H
 //
 // This is the declaration of the GeneralFFVVertex 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 "GeneralFFVVertex.fh"
 
 namespace ThePEG {
 
 namespace Helicity{
 
 /** \ingroup Helicity
  *
  *  The GeneralFFVVertex class is the base class for all helicity amplitude
  *  vertices which use a general form of the fermion-fermion-vector vertex.
  *
  *  Any such vertices should inherit from this class and implement the virtual
  *  setcoupling member function. The base AbstractFFVVertex class is
  *  used to store the particles allowed to interact at the vertex.
  *
  *  The form of the vertex is
  *  \f[ic\bar{f_2}\gamma^\mu a^\lambda P_\lambda f_1\epsilon_{3\mu}\f]
  *
  *  @see AbstractFFVVertex
  */
 class GeneralFFVVertex: public AbstractFFVVertex {
   
 public:
   
   /**
    * Standard Init function used to initialize the interfaces.
    */
   static void Init();
 
   /**
    * Members to calculate the helicity amplitude expressions for vertices
    * and off-shell particles.
    */
   //@{
   /**
    * Evalulate the vertex.
    * @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
    * @param sp1   The wavefunction for the ferimon.
    * @param sbar2 The wavefunction for the antifermion.
    * @param vec3  The wavefunction for the vector.
    */
   Complex evaluate(Energy2 q2,const SpinorWaveFunction & sp1,
            const SpinorBarWaveFunction & sbar2,const VectorWaveFunction & vec3);
 
   /**
    * Evaluate the off-shell barred spinor coming from the vertex.
    * @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
    * @param iopt Option of the shape of the Breit-Wigner for the off-shell barred spinor.
    * @param out The ParticleData pointer for the off-shell barred spinor.
    * @param sbar2 The wavefunction for the antifermion.
    * @param vec3  The wavefunction for the vector.
    * @param mass The mass of the off-shell particle if not taken from the ParticleData
    * object
    * @param width The width of the off-shell particle if not taken from the ParticleData
    * object
    */
   SpinorBarWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                  const SpinorBarWaveFunction & sbar2,
                  const VectorWaveFunction & vec3,
                  complex<Energy> mass=-GeV, complex<Energy> width=-GeV);
 
   /**
    * Evaluate the off-shell vector coming from the vertex.
    * @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
    * @param iopt Option of the shape of the Breit-Wigner for the off-shell vector.
    * @param out The ParticleData pointer for the off-shell vector.
    * @param sp1   The wavefunction for the ferimon.
    * @param sbar2 The wavefunction for the antifermion.
    * @param mass The mass of the off-shell particle if not taken from the ParticleData
    * object
    * @param width The width of the off-shell particle if not taken from the ParticleData
    * object
    */
   VectorWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                   const SpinorWaveFunction & sp1,
                   const SpinorBarWaveFunction & sbar2,
                   complex<Energy> mass=-GeV, complex<Energy> width=-GeV);
 
   /**
    * Evaluate the off-shell spinor coming from the vertex.
    * @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
    * @param iopt Option of the shape of the Breit-Wigner for the off-shell spinor.
    * @param out The ParticleData pointer for the off-shell spinor.
    * @param sp1   The wavefunction for the ferimon.
    * @param vec3  The wavefunction for the vector.
    * @param mass The mass of the off-shell particle if not taken from the ParticleData
    * object
    * @param width The width of the off-shell particle if not taken from the ParticleData
    * object
    */
   SpinorWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                   const SpinorWaveFunction & sp1,
                   const VectorWaveFunction & vec3,
                   complex<Energy> mass=-GeV, complex<Energy> width=-GeV);
   //@}
 
   /**
    *   Set coupling methods
    */
   //@{
   /**
    * Calculate the couplings for a three point interaction.
    * This method is virtual and must be implemented in 
    * classes inheriting from this.
    * @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
    * @param part1 The ParticleData pointer for the first  particle.
    * @param part2 The ParticleData pointer for the second particle.
    * @param part3 The ParticleData pointer for the third  particle.
    */
   virtual void setCoupling(Energy2 q2,tcPDPtr part1,
                tcPDPtr part2,tcPDPtr part3)=0;
 
   /**
    * Dummy setCouplings for a four point interaction 
    * This method is virtual and must be implemented in 
    * classes inheriting from this.
    */
   virtual void setCoupling(Energy2,tcPDPtr,tcPDPtr,tcPDPtr,tcPDPtr) {
     assert(false);
   }
   //@}
 
   /**
    * Get the Couplings 
    */
   //@{
   /**
    * Get the left coupling.
    */
   const Complex & getLeft() { return _left; }
 
   /**
    * Get the right coupling.
    */
   const Complex & getRight() { return _right; }
 
   /**
    *  Get the left coupling for the \f$\sigma^{\mu\nu}\f$ term
    */
   const complex<InvEnergy> getLeftSigma() { return _leftSigma; }
 
   /**
    *  Get the right coupling for the \f$\sigma^{\mu\nu}\f$ term
    */
   const complex<InvEnergy> getRightSigma() { return _rightSigma; }
   //@}
 
 protected:
 
   /**
    *  Set the couplings
    */
   //@{
   /**
    * Set the left coupling.
    */
   void setLeft(const Complex & in) { _left = in; }
 
   /**
    * Set the right coupling.
    */
   void setRight(const Complex & in) { _right = in; }
 
   /**
    *  Set the left coupling for the \f$\sigma^{\mu\nu}\f$ term
    */
   void  setLeftSigma(const complex<InvEnergy> & in) { _leftSigma  = in; }
 
   /**
    *  Set the right coupling for the \f$\sigma^{\mu\nu}\f$ term
    */
   void setRightSigma(const complex<InvEnergy> & in) { _rightSigma = in; }
   //@}
 
 private:
   
   /**
    * Private and non-existent assignment operator.
    */
   GeneralFFVVertex & operator=(const GeneralFFVVertex &) = delete;
   
 private:
 
   /**
    *  Left \f$\gamma^\mu\f$ coupling.
    */
   Complex _left;
 
   /**
    * Right \f$\gamma^\mu\f$ coupling.
    */
   Complex _right;
 
   /**
    * Left \f$\sigma^{\mu\nu}\f$ coupling
    */
   complex<InvEnergy> _leftSigma;
 
   /**
    * Right \f$\sigma^{\mu\nu}\f$ coupling
    */
   complex<InvEnergy> _rightSigma;
   
 };
 }
 
 }
 #endif /* ThePEG_GeneralFFVVertex_H */

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