/usr/include/ThePEG/StandardModel/O1AlphaS.h is in libthepeg-dev 1.8.0-1.
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 | // -*- C++ -*-
//
// O1AlphaS.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_O1AlphaS_H
#define ThePEG_O1AlphaS_H
// This is the declaration of the O1AlphaS class.
#include "AlphaSBase.h"
namespace ThePEG {
/**
* O1AlphaS inherits from AlphaSBase and implements the leading order
* running QCD coupling. The value is determined by a
* \f$\Lambda_{QCD}\f$ parameter at a given number of
* flavours. Optionally the coupling can be frozen under some minimum
* scale to avoid divergencies or negative couplings.
*
* @see \ref O1AlphaSInterfaces "The interfaces"
* defined for O1AlphaS.
*/
class O1AlphaS: public AlphaSBase {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* Default constructor.
*/
O1AlphaS()
: theLambdaQCD(0.25*GeV), theLambdaFlavour(4),
theMaxFlav(6), Q0(ZERO) {}
//@}
public:
/** @name Virtual functions mandated by the sub-class. */
//@{
/**
* The \f$\alpha_S\f$. Return the QCD coupling for a given \a scale
* using the given standard model object \a sm.
*/
virtual double value(Energy2 scale, const StandardModelBase &) const;
/**
* Return the number of loops contributing to
* the running this coupling.
*/
virtual unsigned int nloops () const { return 1; }
/**
* Return the flavour thresholds used. The returned vector contains
* (in position <code>i</code>) the scales when the active number of
* flavours changes from <code>i</code> to <code>i+1</code>.
*/
virtual vector<Energy2> flavourThresholds() const;
/**
* Return the \f$\Lambda_{QCD}\f$ used for different numbers of
* active flavours.
*/
virtual vector<Energy> LambdaQCDs() const;
//@}
/**
* Return the maximum number of active flavours.
*/
int getMaxFlav() const { return theMaxFlav; }
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 interface.
*/
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:
/**
* The \f$\Lambda_{QCD}\f$ for the number of flavours specified by
* theLambdaFlavour. Other \f$\Lambda_{QCD}\f$ values for other
* numbers of active flavours are calculated from
* flavourThresholds() using a continuity requirement.
*/
Energy theLambdaQCD;
/**
* The number of flavours for which theLambdaQCD is given.
*/
int theLambdaFlavour;
/**
* The maximum number of active flavours.
*/
int theMaxFlav;
/**
* The scale below which \f$\alpha_S\f$ is frozen.
*/
Energy Q0;
private:
/**
* Describe a concrete class with persistent data.
*/
static ClassDescription<O1AlphaS> initO1AlphaS;
/**
* Private and non-existent assignment operator.
*/
O1AlphaS & operator=(const O1AlphaS &);
};
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the base classes
* of O1AlphaS. */
template <>
struct BaseClassTrait<O1AlphaS,1>: public ClassTraitsType {
/** Typedef of the first base class of O1AlphaS. */
typedef AlphaSBase NthBase;
};
/** This template specialization informs ThePEG about the name of the
* O1AlphaS class and the shared object where it is
* defined. */
template <>
struct ClassTraits<O1AlphaS>: public ClassTraitsBase<O1AlphaS> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::O1AlphaS"; }
/** Return the name of the shared library be loaded to get access to
* the O1AlphaS class and every other class it uses
* (except the base class). */
static string library() { return "O1AlphaS.so"; }
};
/** @endcond */
}
#endif /* ThePEG_O1AlphaS_H */
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