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 // -*- C++ -*-
 //
 // FFVTVertex.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_FFVTVertex_H
 #define ThePEG_FFVTVertex_H
 //
 // This is the declaration of the FFVTVertex class.
 //
 #include "ThePEG/Helicity/Vertex/AbstractFFVTVertex.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/TensorWaveFunction.h"
 #include "FFVTVertex.fh"
 
 namespace ThePEG {
 namespace Helicity {
 
 /** \ingroup Helicity
  *  
  *  The FFVTVertex class is the implementation of the 
  *  fermion-fermion--vector-tensor vertex. 
  *  It inherits from the AbstractFFVTVertex class for the storage of the particles
  *  interacting at the vertex and implements the helicity amplitude calculations.
  *
  *  All implementations of this vertex should inherit from it and implement the
  *  virtual setCoupling member.
  *
  *  The form of the vertex is
  * \f[\frac{ig\kappa}4t^a_{nm}\bar{f_2}(C_{\mu\nu,\rho\sigma}-g_{\mu\nu}g_{\rho\sigma})
  * \gamma^\sigma f_1\epsilon_{3\rho}\epsilon_4^{\mu\nu}\f]
  *  where
  *  -\f$C_{\mu\nu,\rho\sigma}=g_{\mu\rho}g_{\nu\sigma}+g_{\mu\sigma}g_{\nu\rho}
  *         -g_{\mu\nu}g_{\rho\sigma}\f$.
  *
  *  @see AbstractFFVTVertex
  */
 class FFVTVertex: public AbstractFFVTVertex {
       
 public:
 
   /**
    *  Default constructor
    */
   FFVTVertex() : left_(1.), right_(1.) {}
 
   /**
    * Standard Init function used to initialize the interfaces.
    */
   static void Init();
   
 public:
   
   /**
    * 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.
    * @param ten4  The wavefunction for the tensor.
    */
   Complex evaluate(Energy2 q2,const SpinorWaveFunction & sp1,
            const SpinorBarWaveFunction & sbar2,
            const VectorWaveFunction & vec3, const TensorWaveFunction & ten4);
   //@}
 
   /**
    *   Set coupling methods
    */
   //@{
   /**
    * Dummy for a three point interaction.
    */
   virtual void setCoupling(Energy2,tcPDPtr,tcPDPtr,tcPDPtr) {
     assert(false);
   }
 
   /**
    * Calculate the couplings for a four 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.
    * @param part4 The ParticleData pointer for the fourth particle.
    */
   virtual void setCoupling(Energy2 q2,tcPDPtr part1,tcPDPtr part2,tcPDPtr part3,
                tcPDPtr part4)=0;
   //@}
 
   /**
    *  Left and right couplings
    */
   //@{
   /**
    *  Get left
    */
   Complex left() const {return left_;}
 
   /**
    *  Set left
    */
   void left(Complex in) {left_ = in;}
 
   /**
    *  Get right
    */
   Complex right() const {return right_;}
 
   /**
    *  Set right
    */
   void right(Complex in) {right_ = in;}
   //@}
     
 private:
   
   /**
    * Private and non-existent assignment operator.
    */
   FFVTVertex & operator=(const FFVTVertex &) = delete;
   
 private:
 
   /**
    *  Left coupling
    */
   Complex left_;
 
   /**
    *  Right coupling
    */
   Complex right_;
 
 };
 }
 
 }
 #endif /* ThePEG_FFVTVertex_H */

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