Models/StandardModel/SMFFHVertex.h

0001 // -*- C++ -*-
0002 //
0003 // SMFFHVertex.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_SMFFHVertex_H
0010 #define HERWIG_SMFFHVertex_H
0011 //
0012 // This is the declaration of the SMFFHVertex class.
0013
0014 #include "ThePEG/Helicity/Vertex/Scalar/FFSVertex.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  *  This is the implementation of the vertex coupling the Standard Model Higgs
0024  *  to the Standard Model fermions for helicity amplitude calculations
0025  *
0026  *  @see FFSVertex
0027  *  @see VertexBase
0028  */
0029 class SMFFHVertex: public FFSVertex {
0030
0031 public:
0032
0033   /**
0034    * Default constructor.
0035    */
0036   SMFFHVertex();
0037
0038   /**
0039    * Calculate the couplings.
0040    * @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
0041    * @param part1 The ParticleData pointer for the first  particle.
0042    * @param part2 The ParticleData pointer for the second particle.
0043    * @param part3 The ParticleData pointer for the third  particle.
0044   */
0045   virtual void setCoupling(Energy2 q2,tcPDPtr part1,tcPDPtr part2,tcPDPtr part3);
0046
0047 public:
0048
0049   /** @name Functions used by the persistent I/O system. */
0050   //@{
0051   /**
0052    * Function used to write out object persistently.
0053    * @param os the persistent output stream written to.
0054    */
0055   void persistentOutput(PersistentOStream & os) const;
0056
0057   /**
0058    * Function used to read in object persistently.
0059    * @param is the persistent input stream read from.
0060    * @param version the version number of the object when written.
0061    */
0062   void persistentInput(PersistentIStream & is, int version);
0063   //@}
0064
0065   /**
0066    * Standard Init function used to initialize the interfaces.
0067    */
0068   static void Init();
0069
0070 protected:
0071
0072   /** @name Clone Methods. */
0073   //@{
0074   /**
0075    * Make a simple clone of this object.
0076    * @return a pointer to the new object.
0077    */
0078   virtual IBPtr clone() const;
0079
0080   /** Make a clone of this object, possibly modifying the cloned object
0081    * to make it sane.
0082    * @return a pointer to the new object.
0083    */
0084   virtual IBPtr fullclone() const;
0085   //@}
0086
0087 protected:
0088
0089   /**
0090    * Initialize this object after the setup phase before saving and
0091    * EventGenerator to disk.
0092    * @throws InitException if object could not be initialized properly.
0093    */
0094   virtual void doinit();
0095
0096 private:
0097
0098   /**
0099    * Private and non-existent assignment operator.
0100    */
0101   SMFFHVertex & operator=(const SMFFHVertex &) = delete;
0102
0103 private:
0104
0105   /**
0106    * Pointer to the SM object.
0107    */
0108   tcHwSMPtr _theSM;
0109
0110   /**
0111    * Storage of the couplings.
0112    */
0113   //@{
0114   /**
0115    *  Last evaluation of the coupling
0116    */
0117   complex<InvEnergy> _couplast;
0118
0119   /**
0120    *  The PDG code of the last fermion the coupling was evaluated for.
0121    */
0122   int _idlast;
0123
0124   /**
0125    *  The last \f$q^2\f$ the coupling was evaluated at.
0126    */
0127   Energy2 _q2last;
0128
0129   /**
0130    * The mass of the last fermion for which the coupling was evaluated.
0131    */
0132   Energy _masslast;
0133
0134   /**
0135    *  The mass of the \f$W\f$ boson.
0136    */
0137   Energy _mw;
0138
0139   /**
0140    * A definite fermion flavour to couple to. All other flavours are ignored,
0141    * if this is different from zero.
0142    */
0143   int _fermion;
0144   //@}
0145 };
0146
0147 }
0148
0149 #endif /* HERWIG_SMFFHVertex_H */