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MEvv2vv.h
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// -*- C++ -*-
//
// MEvv2vv.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_MEvv2vv_H
#define HERWIG_MEvv2vv_H
//
// This is the declaration of the MEvv2vv class.
//
#include "GeneralHardME.h"
#include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
#include "ThePEG/Helicity/Vertex/AbstractVVVVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVTVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVSVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVVVVertex.h"
#include "ProductionMatrixElement.h"
#include "MEvv2vv.fh"
namespace Herwig {
using namespace ThePEG;
using Helicity::VectorWaveFunction;
/**
* This is the implementation of the matrix element for
* \f$2\to 2\f$ massless vector-boson pair to vector-boson pair. It inherits from
* GeneralHardME and implements the appropriate virtual member functions.
*
* @see \ref MEvv2vvInterfaces "The interfaces"
* defined for MEvv2vv.
*/
class MEvv2vv: public GeneralHardME {
public:
/**
* Typedef for VectorWaveFunction
*/
typedef vector<VectorWaveFunction> VBVector;
public:
/**
* The default constructor.
*/
inline MEvv2vv();
public:
/** @name Virtual functions required by the GeneralHardME 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:
/**
* Compute the matrix element for \f$V\, V\to V\, V\f$
* @param vin1 VectorWaveFunctions for first incoming particle
* @param vin2 VectorWaveFunctions for second incoming particle
* @param vout1 VectorWaveFunctions for first outgoing particle
* @param mc Whether vout1 is massless or not
* @param vout2 VectorWaveFunctions for outgoing particle
* @param md Whether vout2 is massless or not
* @param me2 colour averaged, spin summed ME
* @return ProductionMatrixElement containing results of
* helicity calculations
*/
ProductionMatrixElement
vv2vvHeME(VBVector & vin1, VBVector & vin2,
VBVector & vout1, bool mc, VBVector & vout2, bool md,
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 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.
*/
virtual void doinit() throw(InitException);
//@}
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<MEvv2vv> initMEvv2vv;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEvv2vv & operator=(const MEvv2vv &);
private:
/**
* Store the dynamically casted VVSVertex pointers
*/
vector<pair<AbstractVVSVertexPtr, AbstractVVSVertexPtr> > theScaV;
/**
* Store the dynamically casted VVVVertex pointers
*/
vector<pair<AbstractVVVVertexPtr, AbstractVVVVertexPtr> > theVecV;
/**
* Store the dynamically casted VVTVertex pointers
*/
vector<pair<AbstractVVTVertexPtr, AbstractVVTVertexPtr> > theTenV;
/**
* Store the dynamically casted VVVVVertex pointer
*/
AbstractVVVVVertexPtr theFPVertex;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEvv2vv. */
template <>
struct BaseClassTrait<Herwig::MEvv2vv,1> {
/** Typedef of the first base class of MEvv2vv. */
typedef Herwig::GeneralHardME NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEvv2vv class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MEvv2vv>
: public ClassTraitsBase<Herwig::MEvv2vv> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MEvv2vv"; }
};
/** @endcond */
}
#include "MEvv2vv.icc"
#endif /* HERWIG_MEvv2vv_H */

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