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MEqq2W2ff.h
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MEqq2W2ff.h
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// -*- C++ -*-
//
// MEqq2W2ff.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_MEqq2W2ff_H
#define HERWIG_MEqq2W2ff_H
//
// This is the declaration of the MEqq2W2ff class.
//
#include "Herwig++/MatrixElement/HwME2to2Base.h"
#include "Herwig++/MatrixElement/ProductionMatrixElement.h"
#include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
#include "ThePEG/Helicity/Vertex/AbstractFFVVertex.fh"
namespace Herwig {
using namespace ThePEG;
using namespace ThePEG::Helicity;
/**
* The MEqq2W2ff class implements the matrix element for \f$q\bar{q'}\to W^\pm\f$
* including the decay of the \f$W^\pm\f$ to Standard Model fermions.
*
* @see \ref MEqq2W2ffInterfaces "The interfaces"
* defined for MEqq2W2ff.
*/
class MEqq2W2ff: public HwME2to2Base {
public:
/**
* The default constructor.
*/
MEqq2W2ff();
/** @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.
*/
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:
/**
* Matrix element for \f$q\bar{q}\to \gamma/Z \to f\bar{f}\f$.
* @param fin Spinors for incoming quark
* @param ain Spinors for incoming antiquark
* @param fout Spinors for incoming quark
* @param aout Spinors for incoming antiquark
* @param me Whether or not to calculate the matrix element for spin correlations
*/
double qqbarME(vector<SpinorWaveFunction> & fin ,
vector<SpinorBarWaveFunction> & ain ,
vector<SpinorBarWaveFunction> & fout,
vector<SpinorWaveFunction> & aout,
bool me) const;
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
inline virtual IBPtr clone() const { return new_ptr(*this); }
/** 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 { return new_ptr(*this); }
//@}
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.
*/
virtual void doinit();
//@}
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<MEqq2W2ff> initMEqq2W2ff;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEqq2W2ff & operator=(const MEqq2W2ff &);
private:
/**
* Pointer to the W vertex
*/
AbstractFFVVertexPtr _theFFWVertex;
/**
* Pointers to the intermediates resonances
*/
//@{
/**
* Pointer to the \f$W^+\f$
*/
tcPDPtr _wp;
/**
* Pointer to the \f$W^-\f$
*/
tcPDPtr _wm;
//@}
/**
* Switches to control the particles in the hard process
*/
//@{
/**
* The allowed flavours of the incoming quarks
*/
unsigned int _maxflavour;
/**
* Which intermediate \f$W^\pm\f$ bosons to include
*/
unsigned int _plusminus;
/**
* Which decay products of the \f$W^\pm\f$ to include
*/
unsigned int _process;
//@}
/**
* Matrix element for spin correlations
*/
ProductionMatrixElement _me;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEqq2W2ff. */
template <>
struct BaseClassTrait<Herwig::MEqq2W2ff,1> {
/** Typedef of the first base class of MEqq2W2ff. */
typedef Herwig::HwME2to2Base NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEqq2W2ff class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MEqq2W2ff>
: public ClassTraitsBase<Herwig::MEqq2W2ff> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MEqq2W2ff"; }
/** Return the name(s) of the shared library (or libraries) be loaded to get
* access to the MEqq2W2ff class and any other class on which it depends
* (except the base class). */
static string library() { return "HwMEHadron.so"; }
};
/** @endcond */
}
#endif /* HERWIG_MEqq2W2ff_H */

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