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MEff2ff.h
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// -*- C++ -*-
//
// MEff2ff.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_MEff2ff_H
#define HERWIG_MEff2ff_H
//
// This is the declaration of the MEff2ff class.
//
#include "GeneralHardME.h"
#include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
#include "Herwig/MatrixElement/ProductionMatrixElement.h"
#include "ThePEG/Helicity/Vertex/AbstractFFSVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractFFVVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractFFTVertex.h"
namespace Herwig {
using namespace ThePEG;
using Helicity::SpinorWaveFunction;
using Helicity::SpinorBarWaveFunction;
/**
* This is the implementation of the \f$ 2\to 2\f$ matrix element for
* a \f$ \Psi \Psi \to \Psi \Psi\f$ process. It inherits from
* GeneralHardME and implements the appropriate virtual functions.
*
* @see \ref MEff2ffInterfaces "The Interfaces"
* defined for MEff2ff.
* @see GeneralHardME
*/
class MEff2ff: public GeneralHardME {
public:
/** Vector of SpinorWaveFunctions. */
typedef vector<SpinorWaveFunction> SpinorVector;
/** Vector of SpinorBarWaveFunctions. */
typedef vector<SpinorBarWaveFunction> SpinorBarVector;
public:
/**
* The default constructor.
*/
MEff2ff() : scalar_(0), vector_(0), tensor_(0), spin_(4), sbar_(4)
{}
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;
//@}
private:
/** @name Functions to compute the ProductionMatrixElement. */
//@{
/**
* Compute the matrix element for \f$\Psi\bar{\Psi}\to\Psi\bar{\Psi}\f$
* @param me2 colour averaged, spin summed ME
* @param first Whether or not first call to decide if colour decomposition etc
* should be calculated
* @return ProductionMatrixElement containing results of
* helicity calculations
*/
ProductionMatrixElement
ffb2ffbHeME(double & me2, bool first) const;
/**
* Compute the matrix element for \f$\Psi\Psi\to\Psi\Psi\f$
* @param first Whether or not first call to decide if colour decomposition etc
* should be calculated
* @return ProductionMatrixElement containing results of
* helicity calculations
*/
ProductionMatrixElement ff2ffHeME(double & me2, bool first) const;
/**
* Compute the matrix element for
* \f$\bar{\Psi}\bar{\Psi}\to\bar{\Psi}\bar{\Psi}\f$
* @param me2 colour averaged, spin summed ME
* @param first Whether or not first call to decide if colour decomposition etc
* should be calculated
* @return ProductionMatrixElement containing results of
* helicity calculations
*/
ProductionMatrixElement fbfb2fbfbHeME(double & me2, bool first) const;
/**
* Compute the matrix element for \f$\Psi\bar{\Psi}\to\lambda\lambda\f$
* @param me2 colour averaged, spin summed ME
* @param first Whether or not first call to decide if colour decomposition etc
* should be calculated
* @return ProductionMatrixElement containing results of
* helicity calculations
*/
ProductionMatrixElement
ffb2mfmfHeME(double & me2, bool first) 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 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<MEff2ff> initMEff2ff;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEff2ff & operator=(const MEff2ff &);
private:
/**
* Store the vector of FFSVertex pairs
*/
vector<pair<AbstractFFSVertexPtr, AbstractFFSVertexPtr> > scalar_;
/**
* Store the vector of FFVVertex pairs
*/
vector<pair<AbstractFFVVertexPtr, AbstractFFVVertexPtr> > vector_;
/**
* Store the vector of FFTVertex pairs
*/
vector<pair<AbstractFFTVertexPtr, AbstractFFTVertexPtr> > tensor_;
/**
* Spinors
*/
mutable vector<vector<SpinorWaveFunction> > spin_;
/**
* Barred spinors
*/
mutable vector<vector<SpinorBarWaveFunction> > sbar_;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEff2ff. */
template <>
struct BaseClassTrait<Herwig::MEff2ff,1> {
/** Typedef of the first base class of MEff2ff. */
typedef Herwig::GeneralHardME NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEff2ff class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MEff2ff>
: public ClassTraitsBase<Herwig::MEff2ff> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MEff2ff"; }
};
/** @endcond */
}
#endif /* HERWIG_MEff2ff_H */

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