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MEfv2vf.h
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// -*- C++ -*-
//
// MEfv2vf.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2011 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_MEfv2vf_H
#define HERWIG_MEfv2vf_H
//
// This is the declaration of the MEfv2vf class.
//
#include "GeneralHardME.h"
#include "Herwig++/MatrixElement/ProductionMatrixElement.h"
#include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
#include "ThePEG/Helicity/Vertex/AbstractFFVVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVVVertex.h"
namespace Herwig {
using namespace ThePEG;
/**
* This class implements the matrix element for a fermion and a vector
* boson to a fermion and a vector boson. It inherits from GeneralHardME
* and implements the appropriate virtual functions.
*
* @see \ref MEfv2vfInterfaces "The interfaces"
* defined for MEfv2vf.
*/
class MEfv2vf: public GeneralHardME {
public:
/** A vector of SpinorWaveFunctions. */
typedef vector<Helicity::SpinorWaveFunction> SpinorVector;
/** A vector of SpinorBarWaveFunctions. */
typedef vector<Helicity::SpinorBarWaveFunction> SpinorBarVector;
/** A vector of VectorWaveFunctions. */
typedef vector<Helicity::VectorWaveFunction> VBVector;
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;
//@}
/**
* Construct the vertex information for the spin correlations
* @param sub Pointer to the relevent SubProcess
*/
virtual void constructVertex(tSubProPtr sub);
private:
/** @name Functions to calculate the Helicity MatrixElement.*/
//@{
/**
* Calculate the matrix element for an incoming fermion
* @param spIn A vector of spinors for the incoming fermion
* @param vecIn A vector of VectorWaveFunctions for the incoming boson
* @param spbOut A vector of SpinorBarWaveFunctions for the outgoing fermion
* @param vecOut A vector of VectorWaveFunctions for the outgoing boson
* @param mc If the outgoing vector is massless or not
* @param first Whether or not first call to decide if colour decomposition etc
* should be calculated
* @param mesq The matrix element squared
*/
ProductionMatrixElement
fv2vfHeME(const SpinorVector & spIn, const VBVector & vecIn,
const VBVector & vecOut, bool mc,
const SpinorBarVector & spbOut,
double & mesq, bool first) const;
/**
* Calculate the matrix element for an incoming anti-fermion
* @param spbIn A vector of SpinorBarWaveFunctions for the incoming anti-fermion
* @param vecIn A vector of VectorWaveFunctions for the incoming boson
* @param spOut A vector of Spinors for the outgoing antifermion
* @param vecOut A vector of VectorWaveFunctions for the outgoing boson
* @param mc If the outgoing vector is massless or not
* @param first Whether or not first call to decide if colour decomposition etc
* should be calculated
* @param mesq The matrix element squared
*/
ProductionMatrixElement
fbv2vfbHeME(const SpinorBarVector & spbIn, const VBVector & vecIn,
const VBVector & vecOut, bool mc,
const SpinorVector & spOut,
double & mesq, bool first) 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();
//@}
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
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.
*/
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<MEfv2vf> initMEfv2vf;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEfv2vf & operator=(const MEfv2vf &);
private:
/** @name Store dynamically casted vertices. */
//@{
/**
* A pair off FFVVertex pointers
*/
vector<pair<AbstractFFVVertexPtr, AbstractFFVVertexPtr> > fermion_;
/**
* A pair of FFVVertex, VVVertex pointers
*/
vector<pair<AbstractFFVVertexPtr, AbstractVVVVertexPtr> > vector_;
//@}
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEfv2vf. */
template <>
struct BaseClassTrait<Herwig::MEfv2vf,1> {
/** Typedef of the first base class of MEfv2vf. */
typedef Herwig::GeneralHardME NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEfv2vf class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MEfv2vf>
: public ClassTraitsBase<Herwig::MEfv2vf> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MEfv2vf"; }
};
/** @endcond */
}
#endif /* HERWIG_MEfv2vf_H */

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