/usr/include/ThePEG/MatrixElement/ME2to2QCD.h is in libthepeg-dev 1.8.0-1.
This file is owned by root:root, with mode 0o644.
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//
// ME2to2QCD.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2011 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_ME2to2QCD_H
#define ThePEG_ME2to2QCD_H
// This is the declaration of the ME2to2QCD class.
#include "ThePEG/MatrixElement/ME2to2Base.h"
namespace ThePEG {
/**
* The ME2to2QCD class inherits from the ME2to2Base class and can be
* used as a sub class for all QCD 2\f$\rightarrow\f$ 2 processes. It
* implements some common functions such as common pre-factors,
* maximum number of flavours, treatment of interference terms and
* possibility to enhance certain terms.
*
* @see \ref ME2to2QCDInterfaces "The interfaces"
* defined for ME2to2QCD.
* @see ME2to2Base
*/
class ME2to2QCD: public ME2to2Base {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* Default constructor.
*/
ME2to2QCD()
: theMaxFlavour(5), theKfac(1.0), theKfacA(1.0), useInterference(true) {}
/**
* Destructor.
*/
virtual ~ME2to2QCD();
//@}
public:
/** @name Virtual functions required by the MEBase class. */
//@{
/**
* Return the order in \f$\alpha_S\f$ in which this matrix element
* is given. Returns 2.
*/
virtual unsigned int orderInAlphaS() const;
/**
* Return the order in \f$\alpha_{EM}\f$ in which this matrix
* element is given. Returns 0.
*/
virtual unsigned int orderInAlphaEW() const;
/**
* The common prefactor for all 2\f$\rightarrow\f$ 2 QCD sub-processes
* ie. \f$\alpha_S^2\f$.
*/
double comfac() const;
/**
* Return the heaviest flavour allowed for this matrix element.
*/
int maxFlavour() const { return theMaxFlavour; }
/**
* K-factor for artificially boosting the cross-section.
*/
double Kfac() const { return theKfac; }
/**
* K-factor for artificially boosting colour-annihilation diagrams.
*/
double KfacA() const { return theKfacA >= 0.0? theKfacA: theKfac; }
/**
* Return true if interference terms should be used.
*/
bool interference() const { return useInterference; }
/**
* Return true if argument is a quark.
*/
bool isQuark(const ParticleData & p) const {
return ( p.id() && abs(p.id()) <= maxFlavour() );
}
/**
* Return the quark with flavour i (or gluon if i = 0);
*/
tcPDPtr quark(int i) 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);
//@}
/**
* Standard Init function used to initialize the interfaces.
*/
static void Init();
private:
/**
* The heaviest flavour allowed for incoming and outgoing partons.
*/
int theMaxFlavour;
/**
* Overall K-factor used to boost this cross-section.
*/
double theKfac;
/**
* Overall K-factors used to boost the colour annihilation diagram
* in the cross-section.
*/
double theKfacA;
/**
* Flag so tell whether interference should be used or not.
*/
bool useInterference;
private:
/**
* Describe an abstract base class with persistent data.
*/
static AbstractClassDescription<ME2to2QCD> initME2to2QCD;
/**
* Private and non-existent assignment operator.
*/
ME2to2QCD & operator=(const ME2to2QCD &);
};
}
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/**
* This template specialization informs ThePEG about the
* base class of ME2to2QCD.
*/
template <>
struct BaseClassTrait<ME2to2QCD,1>: public ClassTraitsType {
/** Typedef of the base class of ME2to2QCD. */
typedef ME2to2Base NthBase;
};
/**
* This template specialization informs ThePEG about the name of the
* ME2to2QCD class.
*/
template <>
struct ClassTraits<ME2to2QCD>: public ClassTraitsBase<ME2to2QCD> {
/** Return the class name. */
static string className() { return "ThePEG::ME2to2QCD"; }
};
/** @endcond */
}
#endif /* ThePEG_ME2to2QCD_H */
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