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MEee2gZ2qq.h
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// -*- C++ -*-
//
// MEee2gZ2qq.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2007 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_MEee2gZ2qq_H
#define HERWIG_MEee2gZ2qq_H
//
// This is the declaration of the MEee2gZ2qq class.
//
#include "ThePEG/MatrixElement/ME2to2Base.h"
#include "Herwig++/Models/StandardModel/StandardModel.h"
#include "ThePEG/PDT/EnumParticles.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Utilities/Rebinder.h"
#include "Herwig++/MatrixElement/General/ProductionMatrixElement.h"
#include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
#include "MEee2gZ2qq.fh"
namespace Herwig {
using namespace ThePEG;
/**
* The MEee2gZ2qq class implements the matrix element
* for \f$e^+e^-\to Z/\gamma \to q\bar{q}\f$ including spin correlations.
* The class includes greater control over the type of quark produced than is available
* in the corresponding matrix element from ThePEG, in addition to spin correlations.
*
* @see \ref MEee2gZ2qqInterfaces "The interfaces"
* defined for MEee2gZ2qq.
*/
class MEee2gZ2qq: public ME2to2Base {
public:
/**
* The default constructor.
*/
inline MEee2gZ2qq();
/** @name Virtual functions required by the MEBase class. */
//@{
/**
* Return the order in \f$\alpha_S\f$ in which this matrix
* element is given.
*/
virtual unsigned int orderInAlphaS() const;
/**
* Return the order in \f$\alpha_{EW}\f$ in which this matrix
* element is given.
*/
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;
/**
* Return the scale associated with the last set phase space point.
*/
virtual Energy2 scale() const;
/**
* Add all possible diagrams with the add() function.
*/
virtual void getDiagrams() 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.
*/
inline virtual Selector<DiagramIndex> diagrams(const DiagramVector & dv) 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;
/**
* Construct the vertex of spin correlations.
*/
virtual void constructVertex(tSubProPtr);
//@}
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);
//@}
/**
* The standard Init function used to initialize the interfaces.
* Called exactly once for each class by the class description system
* before the main function starts or
* when this class is dynamically loaded.
*/
static void Init();
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
inline 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.
*/
inline virtual IBPtr fullclone() const;
//@}
protected:
/** @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.
*/
inline virtual void doinit() throw(InitException);
/**
* Rebind pointer to other Interfaced objects. Called in the setup phase
* after all objects used in an EventGenerator has been cloned so that
* the pointers will refer to the cloned objects afterwards.
* @param trans a TranslationMap relating the original objects to
* their respective clones.
* @throws RebindException if no cloned object was found for a given
* pointer.
*/
inline virtual void rebind(const TranslationMap & trans)
throw(RebindException);
/**
* Return a vector of all pointers to Interfaced objects used in this
* object.
* @return a vector of pointers.
*/
inline virtual IVector getReferences();
//@}
private:
/**
* Member to calculate the matrix element
* @param fin Spinors for incoming fermion
* @param ain Spinors for incoming antifermion
* @param fout Spinors for outgoing fermion
* @param aout Spinors for outgong antifermion
* @param me Spin summed Matrix element
* @param cont The continuum piece of the matrix element
* @param BW The Z piece of the matrix element
*/
ProductionMatrixElement HelicityME(vector<SpinorWaveFunction> & fin,
vector<SpinorBarWaveFunction> & ain,
vector<SpinorBarWaveFunction> & fout,
vector<SpinorWaveFunction> & aout,
double & me,
double & cont,
double & BW ) const;
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<MEee2gZ2qq> initMEee2gZ2qq;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEee2gZ2qq & operator=(const MEee2gZ2qq &);
private:
/**
* Pointer to the fermion-antifermion Z vertex
*/
FFVVertexPtr _theFFZVertex;
/**
* Pointer to the fermion-antifermion photon vertex
*/
FFVVertexPtr _theFFPVertex;
/**
* Pointer to the particle data object for the Z
*/
PDPtr _Z0;
/**
* Pointer to the particle data object for the photon
*/
PDPtr _gamma;
/**
* The minimum PDG of the quarks to be produced
*/
unsigned int _minflav;
/**
* The maximum PDG of the quarks to be produced
*/
unsigned int _maxflav;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEee2gZ2qq. */
template <>
struct BaseClassTrait<Herwig::MEee2gZ2qq,1> {
/** Typedef of the first base class of MEee2gZ2qq. */
typedef ME2to2Base NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEee2gZ2qq class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MEee2gZ2qq>
: public ClassTraitsBase<Herwig::MEee2gZ2qq> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MEee2gZ2qq"; }
/** Return the name(s) of the shared library (or libraries) be loaded to get
* access to the MEee2gZ2qq class and any other class on which it depends
* (except the base class). */
static string library() { return "HwMELepton.so"; }
};
/** @endcond */
}
#include "MEee2gZ2qq.icc"
#endif /* HERWIG_MEee2gZ2qq_H */

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