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MEvv2ff.h
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// -*- C++ -*-
//
// MEvv2ff.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_MEvv2ff_H
#define HERWIG_MEvv2ff_H
//
// This is the declaration of the MEvv2ff class.
//
#include "GeneralHardME.h"
#include "ThePEG/Helicity/Vertex/AbstractFFVVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVVVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVTVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractFFTVertex.h"
#include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
#include "Herwig++/MatrixElement/ProductionMatrixElement.h"
namespace Herwig {
using namespace ThePEG;
using ThePEG::Helicity::SpinorWaveFunction;
using ThePEG::Helicity::SpinorBarWaveFunction;
using ThePEG::Helicity::VectorWaveFunction;
/**
* This class is designed to implement the matrix element for the
* \f$2 \rightarrow 2\f$ process vector-vector to fermion-antifermion pair. It
* inherits from GeneralHardME and implements the me2() virtual function.
*
* @see \ref MEvv2ffInterfaces "The Interfaces"
* defined for MEvv2ff.
* @see GeneralHardME
*
*/
class MEvv2ff: public GeneralHardME {
public:
/** A Vector of VectorWaveFunction objects. */
typedef vector<VectorWaveFunction> VBVector;
/** A vector of SpinorBarWaveFunction objects. */
typedef vector<SpinorWaveFunction> SpinorVector;
/** A vector of SpinorBarWaveFunction objects. */
typedef vector<SpinorBarWaveFunction> SpinorBarVector;
public:
/** @name Virtual functions required by the MEBase class. */
//@{
/**
* 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 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 information for the spin correlations
* @param sub Pointer to the relevent SubProcess
*/
virtual void constructVertex(tSubProPtr sub);
private:
/**
* Calculate the value of the matrix element
*/
ProductionMatrixElement vv2ffME(const VBVector & v1, const VBVector & v2,
const SpinorBarVector & sbar,
const SpinorVector & sp, double & me2) const;
protected:
/**
* A debugging function to test the value of me2 against an
* analytic function.
* @param me2 The value of the \f$ |\bar{\mathcal{M}}|^2 \f$
*/
virtual void debug(double me2) 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);
//@}
/**
* 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 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() throw(InitException);
//@}
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);}
//@}
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<MEvv2ff> initMEvv2ff;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEvv2ff & operator=(const MEvv2ff &);
private:
/** @name Dynamically casted vertices. */
//@{
/**
* Intermediate fermion
*/
vector<pair<AbstractFFVVertexPtr, AbstractFFVVertexPtr> > theFerm;
/**
* Intermediate vector
*/
vector<pair<AbstractVVVVertexPtr, AbstractFFVVertexPtr> > theVec;
/**
* Intermediate tensor
*/
vector<pair<AbstractVVTVertexPtr, AbstractFFTVertexPtr> > theTen;
//@}
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEvv2ff. */
template <>
struct BaseClassTrait<Herwig::MEvv2ff,1> {
/** Typedef of the first base class of MEvv2ff. */
typedef Herwig::GeneralHardME NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEvv2ff class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MEvv2ff>
: public ClassTraitsBase<Herwig::MEvv2ff> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MEvv2ff"; }
};
/** @endcond */
}
#endif /* HERWIG_MEvv2ff_H */

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