Models/StandardModel/SMGGGGVertex.h

0001 // -*- C++ -*-
0002 //
0003 // SMGGGGVertex.h is a part of Herwig - A multi-purpose Monte Carlo event generator
0004 // Copyright (C) 2002-2019 The Herwig Collaboration
0005 //
0006 // Herwig is licenced under version 3 of the GPL, see COPYING for details.
0007 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
0008 //
0009 #ifndef HERWIG_SMGGGGVertex_H
0010 #define HERWIG_SMGGGGVertex_H
0011 //
0012 // This is the declaration of the SMGGGGVertex class.
0013 //
0014 #include "ThePEG/Helicity/Vertex/Vector/VVVVVertex.h"
0015 #include "Herwig/Models/StandardModel/StandardModel.h"
0016 #include "ThePEG/PDT/EnumParticles.h"
0017
0018 namespace Herwig {
0019 using namespace ThePEG;
0020
0021 /** \ingroup Helicity
0022  *
0023  *  The SMGGGGVertex class is the implementation of the
0024  *  Standard Model quartic gluon vertex. It inherits from
0025  *  VVVVVertex and implements the setCoupling member.
0026  *
0027  *  @see VVVVVertex
0028  *  @see VertexBase
0029  */
0030 class SMGGGGVertex: public VVVVVertex {
0031
0032 public:
0033
0034   /**
0035    * Default constructor.
0036    */
0037   SMGGGGVertex();
0038
0039   /**
0040    * Standard Init function used to initialize the interfaces.
0041    */
0042   static void Init();
0043
0044   /**
0045    * Calculate the couplings.
0046    * @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
0047    * @param part1 The ParticleData pointer for the first  particle.
0048    * @param part2 The ParticleData pointer for the second particle.
0049    * @param part3 The ParticleData pointer for the third  particle.
0050    * @param part4 The ParticleData pointer for the third  particle.
0051    */
0052   virtual void setCoupling(Energy2 q2,tcPDPtr part1,tcPDPtr part2,
0053                tcPDPtr part3,tcPDPtr part4);
0054
0055 protected:
0056
0057   /** @name Clone Methods. */
0058   //@{
0059   /**
0060    * Make a simple clone of this object.
0061    * @return a pointer to the new object.
0062    */
0063   virtual IBPtr clone() const {return new_ptr(*this);}
0064
0065   /** Make a clone of this object, possibly modifying the cloned object
0066    * to make it sane.
0067    * @return a pointer to the new object.
0068    */
0069   virtual IBPtr fullclone() const {return new_ptr(*this);}
0070   //@}
0071
0072 protected:
0073
0074   /** @name Standard Interfaced functions. */
0075   //@{
0076   /**
0077    * Initialize this object after the setup phase before saving an
0078    * EventGenerator to disk.
0079    * @throws InitException if object could not be initialized properly.
0080    */
0081   virtual void doinit();
0082   //@}
0083
0084 private:
0085
0086   /**
0087    * Private and non-existent assignment operator.
0088    */
0089   SMGGGGVertex & operator=(const SMGGGGVertex &) = delete;
0090
0091   /**
0092    * Storage of the couplings.
0093    */
0094   //@{
0095   /**
0096    *  The last value of the strong coupling calculated.
0097    */
0098   Complex _couplast;
0099
0100   /**
0101    *  The scale \f$q^2\f$ at which the coupling was last evaluated.
0102    */
0103   Energy2 _q2last;
0104   //@}
0105 };
0106 }
0107
0108 #endif /* HERWIG_SMGGGGVertex_H */