/usr/include/ThePEG/MatrixElement/ME2to2QCD.h is in libthepeg-dev 1.8.0-1.1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | // -*- C++ -*-
//
// 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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