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MEee2gZ2qq.h
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// -*- C++ -*-
//
// MEee2gZ2qq.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2017 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_MEee2gZ2qq_H
#define ThePEG_MEee2gZ2qq_H
// This is the declaration of the MEee2gZ2qq class.
#include "ThePEG/MatrixElement/ME2to2QCD.h"
namespace ThePEG {
/**
* The MEee2gZ2qq class implements the
* \f$e^+e^-\rightarrow\gamma/Z^0\rightarrow q\bar{q}\f$ matrix
* element. Both the continuum and \f$Z^0\f$ pole term as well as the
* interference term is included. Although not a strict QCD matrix
* element the class inherits from ME2to2QCD, mainly to inherit the
* parameter for the number of active quark flavours.
*
* @see \ref MEee2gZ2qqInterfaces "The interfaces"
* defined for MEee2gZ2qq.
* @see ME2to2QCD
*/
class MEee2gZ2qq: public ME2to2QCD {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* Default constructor.
*/
MEee2gZ2qq();
//@}
public:
/** @name Virtual functions required by the MEBase class. */
//@{
/**
* Return the order in \f$\alpha_S\f$ in which this matrix element
* is given. Returns .
*/
virtual unsigned int orderInAlphaS() const;
/**
* Return the order in \f$\alpha_{EM}\f$ in which this matrix
* element is given. Returns 2.
*/
virtual unsigned int orderInAlphaEW() const;
/**
* The matrix element for the kinematical configuration
* previously provided by the last call to setKinematics(), suitably
* scaled by sHat() to give a dimension-less number.
* @return the matrix element scaled with sHat() to give a
* dimensionless number.
*/
virtual double me2() const;
/**
* Add all possible diagrams with the add() function.
*/
virtual void getDiagrams() const;
/**
* Return a Selector with possible colour geometries for the selected
* diagram weighted by their relative probabilities.
* @param diag the diagram chosen.
* @return the possible colour geometries weighted by their
* relative probabilities.
*/
virtual Selector<const ColourLines *>
colourGeometries(tcDiagPtr diag) const;
/**
* Get diagram selector. With the information previously supplied with the
* setKinematics method, a derived class may optionally
* override this method to weight the given diagrams with their
* (although certainly not physical) relative probabilities.
* @param dv the diagrams to be weighted.
* @return a Selector relating the given diagrams to their weights.
*/
virtual Selector<DiagramIndex> diagrams(const DiagramVector & dv) const;
/**
* Return the scale associated with the last set phase space point.
*/
virtual Energy2 scale() const;
//@}
public:
/** @name Functions used by the persistent I/O system. */
//@{
/**
* Function used to write out object persistently.
* @param os the persistent output stream written to.
*/
void persistentOutput(PersistentOStream & os) const;
/**
* Function used to read in object persistently.
* @param is the persistent input stream read from.
* @param version the version number of the object when written.
*/
void persistentInput(PersistentIStream & is, int version);
//@}
/**
* Standard Init function used to initialize the interface.
*/
static void Init();
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
virtual IBPtr clone() const;
/** Make a clone of this object, possibly modifying the cloned object
* to make it sane.
* @return a pointer to the new object.
*/
virtual IBPtr fullclone() const;
//@}
/** @name Standard Interfaced functions. */
//@{
/**
* Initialize this object after the setup phase before saving an
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit();
//@}
protected:
/**
* Constants for the different terms set from the StandardModel in
* the init() function.
*/
vector<double> coefs;
/**
* The squared mass of the Z0.
*/
Energy2 mZ2;
/**
* The squared width of the Z0.
*/
Energy2 GZ2;
/**
* The last continuum term to be used to select primary diagram.
*/
mutable double lastCont;
/**
* The last Breit-Wigner term to be used to select primary diagram.
*/
mutable double lastBW;
private:
/**
* Describe a concrete class with persistent data.
*/
static ClassDescription<MEee2gZ2qq> initMEee2gZ2qq;
/**
* Private and non-existent assignment operator.
*/
MEee2gZ2qq & operator=(const MEee2gZ2qq &);
};
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEee2gZ2qq. */
template <>
struct BaseClassTrait<MEee2gZ2qq,1>: public ClassTraitsType {
/** Typedef of the first base class of MEee2gZ2qq. */
typedef ME2to2QCD NthBase;
};
/** This template specialization informs ThePEG about the name of the
* MEee2gZ2qq class and the shared object where it is defined. */
template <>
struct ClassTraits<MEee2gZ2qq>: public ClassTraitsBase<MEee2gZ2qq> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::MEee2gZ2qq"; }
/** Return the name of the shared library be loaded to get
* access to the MEee2gZ2qq class and every other class it uses
* (except the base class). */
static string library() { return "MEee2gZ2qq.so"; }
};
/** @endcond */
}
#endif /* ThePEG_MEee2gZ2qq_H */

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