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MEff2vv.h
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// -*- C++ -*-
//
// MEff2vv.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_MEff2vv_H
#define HERWIG_MEff2vv_H
//
// This is the declaration of the MEff2vv class.
//
#include "GeneralHardME.h"
#include "ThePEG/Helicity/Vertex/AbstractFFVVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractFFTVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractFFSVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVSVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVTVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVVVertex.h"
#include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
#include "ProductionMatrixElement.h"
#include "MEff2vv.fh"
namespace Herwig {
using namespace ThePEG;
using ThePEG::Helicity::SpinorWaveFunction;
using ThePEG::Helicity::SpinorBarWaveFunction;
using ThePEG::Helicity::VectorWaveFunction;
/**
* This class implements the matrix element calculation for a generic
* \f$\Psi \Psi \rightarrow V^{\mu} V^{\nu}\f$ process.
*
* @see \ref MEff2vvInterfaces "The interfaces"
* defined for MEff2vv.
*/
class MEff2vv: public GeneralHardME {
public:
/** Vector of SpinorWaveFunctions objects */
typedef vector<SpinorWaveFunction> SpinorVector;
/** Vector of SpinorBarWaveFunction objects. */
typedef vector<SpinorBarWaveFunction> SpinorBarVector;
/** Vector of VectorWaveFunction objects. */
typedef vector<VectorWaveFunction> VBVector;
public:
/**
* The default constructor.
*/
inline MEff2vv();
/** @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);
protected:
/**
* A debugging function to test the value of me2 against an
* analytic function.
* @param me2 \f$ |\bar{\mathcal{M}}|^2 \f$
*/
virtual void debug(double me2) const;
private:
/**
* Compute the production matrix element.
* @param sp Spinors for first incoming fermion
* @param sbar SpinorBar Wavefunctions for incoming anti-fermion
* @param v1 A vector of VectorWaveFunction objects for the first vector
* @param m1 Whether v1 is massless or not
* @param v2 A vector of VectorWaveFunction objects for the second vector
* @param m2 Whether v2 is massless or not
* @param me2 The value of the \f$ |\bar{\mathcal{M}}|^2 \f$
*/
ProductionMatrixElement
ff2vvME(const SpinorVector & sp, const SpinorBarVector sbar,
const VBVector & v1, bool m1, const VBVector & v2, bool m2,
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<MEff2vv> initMEff2vv;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEff2vv & operator=(const MEff2vv &);
private:
/**
* Storage for a dynamically cast vertices for a tchannel vector
* intermediate
*/
vector<pair<AbstractFFVVertexPtr, AbstractFFVVertexPtr> > theFerm;
/**
* Storage for a dynamically cast vertices for a schannel vector
* intermediate
*/
vector<pair<AbstractFFVVertexPtr, AbstractVVVVertexPtr> > theVec;
/**
* Storage for a dynamically cast vertices for a schannel scalar
* intermediate
*/
vector<pair<AbstractFFTVertexPtr, AbstractVVTVertexPtr> > theTen;
/**
* Storage for a dynamically cast vertices for a schannel scalar
* intermediate for massless external vector bosons
*/
vector<pair<AbstractFFSVertexPtr, AbstractVVSVertexPtr> > theSca;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEff2vv. */
template <>
struct BaseClassTrait<Herwig::MEff2vv,1> {
/** Typedef of the first base class of MEff2vv. */
typedef Herwig::GeneralHardME NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEff2vv class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MEff2vv>
: public ClassTraitsBase<Herwig::MEff2vv> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MEff2vv"; }
};
/** @endcond */
}
#include "MEff2vv.icc"
#endif /* HERWIG_MEff2vv_H */

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