EIC code displayed by LXR master/​include/​ThePEG/​Helicity/​Vertex/​Tensor/​FFTVertex.h	Source navigation Diff markup Identifier search General search
	Version: master test Revert   Change

File indexing completed on 2026-08-06 09:38:23

 // -*- C++ -*-
 //
 // FFTVertex.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_FFTVertex_H
 #define ThePEG_FFTVertex_H
 //
 // This is the declaration of the FFTVertex class.
 //
 #include "ThePEG/Helicity/Vertex/AbstractFFTVertex.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/TensorWaveFunction.h"
 #include "FFTVertex.fh"
 
 namespace ThePEG {
 namespace Helicity {
 
 /** \ingroup Helicity
  *
  *  The FFTVertex class is the implementation of the fermion-fermion-tensor
  *  vertex. It inherits from the AbstractFFTVertex 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 vertex has the form
  * \f[-\frac{i\kappa}8\bar{f_2}\left[
  *  \gamma_\mu(k_1-k_2)_\nu+\gamma_\nu(k_1-k_2)_\mu
  * -2g_{\mu\nu}(k\!\!\!\!\!\not\,\,\,_1-k\!\!\!\!\!\not\,\,\,_2)+4g_{\mu\nu}m_{f}
  * \right]f_1\epsilon^{\mu\nu}_3\f] 
  *
  *  @see AbstractFFTVertex
  */
 class FFTVertex: public AbstractFFTVertex {
       
 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 ferimon.
    * @param sbar2 The wavefunction for the antifermion.
    * @param ten3  The wavefunction for the tensor.
    */
   Complex evaluate(Energy2 q2,const SpinorWaveFunction & sp1,
            const SpinorBarWaveFunction & sbar2, 
            const TensorWaveFunction & ten3);
 
   /**
    * Evaluate the off-shell tensor 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 tensor.
    * @param out The ParticleData pointer for the off-shell tensor.
    * @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
    */
   TensorWaveFunction 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 ten3  The wavefunction for the tensor.
    * @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 TensorWaveFunction & ten3,
                   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 ten3  The wavefunction for the tensor.
    * @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 TensorWaveFunction& ten3,
                  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);
   }
   //@}
   
 private:
   
   /**
    * Private and non-existent assignment operator.
    */
   FFTVertex & operator=(const FFTVertex &) = delete;
   
 };
 
 }
 
 }
 #endif /* ThePEG_FFTVertex_H */

This page was automatically generated by the 2.3.7 LXR engine. The LXR team