/usr/include/ThePEG/MatrixElement/MEGG2GG.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 | // -*- C++ -*-
//
// MEGG2GG.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_MEGG2GG_H
#define ThePEG_MEGG2GG_H
// This is the declaration of the MEGG2GG class.
#include "ThePEG/MatrixElement/ME2to2QCD.h"
namespace ThePEG {
/**
* MEGG2GG inherits from ME2to2QCD and implements the standard
* \f$gg\rightarrow gg\f$ matrix element.
*
* @see \ref MEGG2GGInterfaces "The interfaces"
* defined for MEGG2GG.
* @see ME2to2QCD
*/
class MEGG2GG: public ME2to2QCD {
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;
/**
* Add all possible diagrams with the add() function.
*/
virtual void getDiagrams() 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;
/**
* Get diagram selector. With the information previously supplied with the
* setKinematics method, a derived class may optionally
* override this method to weight the given diagrams with their
* (although certainly not physical) relative probabilities.
* @param dv the diagrams to be weighted.
* @return a Selector relating the given diagrams to their weights.
*/
virtual Selector<DiagramIndex> diagrams(const DiagramVector & dv) const;
//@}
protected:
/** @name Internal functions returning the matrix element squared
* for different colour configurations. */
//@{
/**
* Return the matrix element squared (without common pre-factors)
* for the specific colour configuration.
*/
double colA1() const { return sqr(1.0 + sHat()/tHat()) + 0.5; }
/**
* Return the matrix element squared (without common pre-factors)
* for the specific colour configuration.
*/
double colB1() const { return sqr(1.0 + uHat()/sHat()) + 0.5; }
/**
* Return the matrix element squared (without common pre-factors)
* for the specific colour configuration.
*/
double colC1() const { return sqr(1.0 + tHat()/uHat()) + 0.5; }
/**
* Return the matrix element squared (without common pre-factors)
* for the specific colour configuration.
*/
double colA2() const { return 0.5 + sqr(1.0 + tHat()/sHat()); }
/**
* Return the matrix element squared (without common pre-factors)
* for the specific colour configuration.
*/
double colB2() const { return 0.5 + sqr(1.0 + sHat()/uHat()); }
/**
* Return the matrix element squared (without common pre-factors)
* for the specific colour configuration.
*/
double colC2() const { return 0.5 + sqr(1.0 + uHat()/tHat()); }
//@}
public:
/**
* Standard Init function used to initialize the interfaces.
*/
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;
//@}
private:
/**
* Describe a concrete class without persistent data.
*/
static NoPIOClassDescription<MEGG2GG> initMEGG2GG;
/**
* Private and non-existent assignment operator.
*/
MEGG2GG & operator=(const MEGG2GG &);
};
}
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEGG2GG. */
template <>
struct BaseClassTrait<MEGG2GG,1>: public ClassTraitsType {
/** Typedef of the first base class of MEGG2GG. */
typedef ME2to2QCD NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEGG2GG class and the shared object where it is defined. */
template <>
struct ClassTraits<MEGG2GG>: public ClassTraitsBase<MEGG2GG> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::MEGG2GG"; }
/** Return the name of the shared library be loaded to get
* access to the MEGG2GG class and every other class it uses
* (except the base class). */
static string library() { return "MEQCD.so"; }
};
/** @endcond */
}
#endif /* ThePEG_MEGG2GG_H */
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