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IFMgqxDipole.h
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IFMgqxDipole.h
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// -*- C++ -*-
//
// IFMgqxDipole.h is a part of Herwig - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2019 The Herwig Collaboration
//
// Herwig is licenced under version 3 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_IFMgqxDipole_H
#define HERWIG_IFMgqxDipole_H
//
// This is the declaration of the IFMgqxDipole class.
//
#include "Herwig/MatrixElement/Matchbox/Dipoles/SubtractionDipole.h"
namespace Herwig {
using namespace ThePEG;
/**
* \ingroup Matchbox
* \author Simon Platzer
*
* \brief IFMgqxDipole implements the D_k^{g,q} subtraction dipole.
*
*/
class IFMgqxDipole: public SubtractionDipole {
public:
/**
* The default constructor.
*/
IFMgqxDipole();
public:
/**
* Return true, if this dipole can possibly handle the indicated
* emitter.
*/
virtual bool canHandleEmitter(const cPDVector& partons, int emitter) const {
return emitter < 2 && partons[emitter]->id() == ParticleID::g;
}
/**
* Return true, if this dipole can possibly handle the indicated
* splitting.
*/
virtual bool canHandleSplitting(const cPDVector& partons, int emitter, int emission) const {
return canHandleEmitter(partons,emitter) && abs(partons[emission]->id()) < 7;
}
/**
* Return true, if this dipole can possibly handle the indicated
* spectator.
*/
virtual bool canHandleSpectator(const cPDVector& partons, int spectator) const {
return spectator > 1 && partons[spectator]->coloured();
}
/**
* Return true, if this dipole applies to the selected
* configuration.
*/
virtual bool canHandle(const cPDVector& partons,
int emitter, int emission, int spectator) const;
/**
* How to sample the z-distribution.
* FlatZ = 1
* OneOverZ = 2
* OneOverOneMinusZ = 3
* OneOverZOneMinusZ = 4
*/
virtual int samplingZ() const {return 2;}
/**
* Return the matrix element for the kinematical configuation
* previously provided by the last call to setKinematics(), suitably
* scaled by sHat() to give a dimension-less number.
*/
virtual double me2() const;
/**
* Return the matrix element averaged over spin correlations.
*/
virtual double me2Avg(double ccme2) 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.
*/
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.
*/
virtual IBPtr fullclone() const;
//@}
// If needed, insert declarations of virtual function defined in the
// InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
private:
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
IFMgqxDipole & operator=(const IFMgqxDipole &) = delete;
};
}
#endif /* HERWIG_IFMgqxDipole_H */

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