Models/UED/UEDZ0H1H1Vertex.h

0001 // -*- C++ -*-
0002 //
0003 // UEDZ0H1H1Vertex.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_UEDZ0H1H1Vertex_H
0010 #define HERWIG_UEDZ0H1H1Vertex_H
0011 //
0012 // This is the declaration of the UEDZ0H1H1Vertex class.
0013 //
0014
0015 #include "ThePEG/Helicity/Vertex/Scalar/VSSVertex.h"
0016 #include "UEDBase.h"
0017
0018 namespace Herwig {
0019 using namespace ThePEG;
0020
0021 /**
0022  * The implementation of the \f$Z^\mu_{(0)}H_{(1)}^+H_{(1)}^-\f$ vertex. This
0023  * class inherits from VSSVertex and implements the setCoupling member function.
0024  *
0025  * The vertex is taken to have the form:
0026  * \f[\frac{g}{1 + m_W^2R^2}\left(\frac{\cos 2\theta_W}{2\cos\theta_W} -
0027  * m_W^2 R^2\cos^2\theta_W \right)\left(p(H_{(1)}^-) - p(H_{(1)}^+)\right) \f]
0028  *
0029  * @see \ref UEDZ0H1H1VertexInterfaces "The interfaces"
0030  * defined for UEDZ0H1H1Vertex.
0031  */
0032 class UEDZ0H1H1Vertex: public VSSVertex {
0033
0034 public:
0035
0036   /**
0037    * The default constructor.
0038    */
0039   UEDZ0H1H1Vertex();
0040
0041 public:
0042
0043   /** @name Functions used by the persistent I/O system. */
0044   //@{
0045   /**
0046    * Function used to write out object persistently.
0047    * @param os the persistent output stream written to.
0048    */
0049   void persistentOutput(PersistentOStream & os) const;
0050
0051   /**
0052    * Function used to read in object persistently.
0053    * @param is the persistent input stream read from.
0054    * @param version the version number of the object when written.
0055    */
0056   void persistentInput(PersistentIStream & is, int version);
0057   //@}
0058
0059   /**
0060    * The standard Init function used to initialize the interfaces.
0061    * Called exactly once for each class by the class description system
0062    * before the main function starts or
0063    * when this class is dynamically loaded.
0064    */
0065   static void Init();
0066
0067   /** Calculate the coupling
0068    *@param q2 The scale at which to evaluate the coupling
0069    *@param part1 The first interacting particle
0070    *@param part2 The second interacting particle
0071    *@param part3 The third interacting particle
0072    */
0073   virtual void setCoupling(Energy2 q2, tcPDPtr part1, tcPDPtr part2,
0074                tcPDPtr part3);
0075
0076 protected:
0077
0078   /** @name Clone Methods. */
0079   //@{
0080   /**
0081    * Make a simple clone of this object.
0082    * @return a pointer to the new object.
0083    */
0084   virtual IBPtr clone() const {return new_ptr(*this);}
0085
0086   /** Make a clone of this object, possibly modifying the cloned object
0087    * to make it sane.
0088    * @return a pointer to the new object.
0089    */
0090   virtual IBPtr fullclone() const {return new_ptr(*this);}
0091   //@}
0092
0093 protected:
0094
0095   /** @name Standard Interfaced functions. */
0096   //@{
0097   /**
0098    * Initialize this object after the setup phase before saving an
0099    * EventGenerator to disk.
0100    * @throws InitException if object could not be initialized properly.
0101    */
0102   virtual void doinit();
0103   //@}
0104
0105 private:
0106
0107   /**
0108    * The assignment operator is private and must never be called.
0109    * In fact, it should not even be implemented.
0110    */
0111   UEDZ0H1H1Vertex & operator=(const UEDZ0H1H1Vertex &) = delete;
0112
0113 private:
0114
0115   /**
0116    * The value of \f$\cos\theta_W\f$.
0117    */
0118   double theCosThetaW;
0119
0120   /**
0121    * The value of \f$\cos 2\theta_W\f$.
0122    */
0123   double theCosTheta2W;
0124
0125   /**
0126    * The mass-squared of the \f$W\f$ boson.
0127    */
0128   Energy2 theMw2;
0129
0130   /**
0131    * The square of the compactification radius.
0132    */
0133   InvEnergy2 theR2;
0134
0135   /**
0136    * The scale at which the coupling was last evaluated.
0137    */
0138   Energy2 theq2Last;
0139
0140   /**
0141    * The value of the coupling when it was last evaluated.
0142    */
0143   Complex theCoupLast;
0144 };
0145 }
0146
0147
0148 #endif /* HERWIG_UEDZ0H1H1Vertex_H */