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 // -*- C++ -*-
 //
 // RFSVertex.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_RFSVertex_H
 #define ThePEG_RFSVertex_H
 //
 // This is the declaration of the RFSVertex class.
 
 #include "ThePEG/Helicity/Vertex/AbstractRFSVertex.h"
 #include "ThePEG/Helicity/WaveFunction/ScalarWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
 #include "RFSVertex.fh"
 
 namespace ThePEG {
 
 namespace Helicity{
 
 /** \ingroup Helicity
  *
  *  The RFSVertex class is the implementation of the interact of a
  *  scalar boson and a spin-3/2 fermion-antifermion pair. It inherits from the AbstractRFSVertex
  *  class for storage of the particles interacting at the vertex and implements
  *  the helicity calculations.
  *
  *  Implementations of specific interactions should inherit from this and implement
  *  the virtual setCoupling member.
  *
  *  The form of the vertex is
  *  \f[ic\bar{f_2}_\mu p_{1}^\mu a^\lambda P_\lambda f_1\phi_3\f]
  *  where \f$a^\pm\f$ are the right and left couplings and \f$P_\pm=(1\pm\gamma_5)\f$
  *  are the chirality projection operators.
  *
  *  @see AbstractRFSVertex
  */
 class RFSVertex: public AbstractRFSVertex {
       
 public:
   
   /**
    * 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 RS ferimon.
    * @param sbar2 The wavefunction for the antifermion.
    * @param sca3  The wavefunction for the scalar.
    */
   Complex evaluate(Energy2 q2,const RSSpinorWaveFunction & sp1,
            const SpinorBarWaveFunction & sbar2,
            const ScalarWaveFunction & sca3);
 
   /**
    * 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 RS antifermion.
    * @param sca3  The wavefunction for the scalar.
    */
   Complex evaluate(Energy2 q2,const SpinorWaveFunction & sp1,
            const RSSpinorBarWaveFunction & sbar2,
            const ScalarWaveFunction & sca3);
 
   /**
    * 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 sca3  The wavefunction for the scalar.
    * @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 RSSpinorWaveFunction & sp1, 
                   const ScalarWaveFunction & sca3,
                   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 sca3  The wavefunction for the scalar.
    * @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
    */
   RSSpinorWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                 const SpinorWaveFunction & sp1, 
                 const ScalarWaveFunction & sca3,
                 complex<Energy> mass=-GeV, complex<Energy> width=-GeV);
 
   /**
    * 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 sca3  The wavefunction for the scalar.
    * @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 RSSpinorBarWaveFunction & sbar2,
                  const ScalarWaveFunction & sca3,
                  complex<Energy> mass=-GeV, complex<Energy> width=-GeV);
 
   /**
    * 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 sca3  The wavefunction for the scalar.
    * @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
    */
   RSSpinorBarWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                    const SpinorBarWaveFunction & sbar2,
                    const ScalarWaveFunction & sca3,
                    complex<Energy> mass=-GeV, complex<Energy> width=-GeV);
 
   /**
    * Evaluate the off-shell scalar 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 scalar.
    * @param out The ParticleData pointer for the off-shell scalar.
    * @param sp1   The wavefunction for the RS 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
    */
   ScalarWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                   const RSSpinorWaveFunction & sp1, 
                   const SpinorBarWaveFunction & sbar2,
                   complex<Energy> mass=-GeV, complex<Energy> width=-GeV);
 
   /**
    * Evaluate the off-shell scalar 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 scalar.
    * @param out The ParticleData pointer for the off-shell scalar.
    * @param sp1   The wavefunction for the ferimon.
    * @param sbar2 The wavefunction for the RS 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
    */
   ScalarWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
                   const SpinorWaveFunction & sp1, 
                   const RSSpinorBarWaveFunction & sbar2,
                   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.
    */
   Complex left() { return _left; }
   
   /**
    * Get the right coupling.
    */
   Complex right() { return _right; }
   //@}
   
 protected:
 
   /**
    *  Set the couplings
    */
   //@{
   /**
    * Set the left coupling.
    */
   void left(Complex in) { _left = in; }
 
   /**
    * Set the right coupling.
    */
   void right(Complex in) { _right = in; }
   //@}
   
 private:
   
   /**
    * Private and non-existent assignment operator.
    */
   RFSVertex & operator=(const RFSVertex &) = delete;
   
 private:
 
   /**
    * Storage of the left coupling.
    */
   Complex _left;
 
   /**
    * Storage of the right coupling.
    */
   Complex _right;
 
 };
 }
 
 }
 #endif /* ThePEG_RFSVertex_H */

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