/usr/include/ThePEG/StandardModel/AlphaSBase.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 | // -*- C++ -*-
//
// AlphaSBase.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_AlphaSBase_H
#define ThePEG_AlphaSBase_H
// This is the declaration of the AlphaSBase class.
#include "RunningCoupling.h"
namespace ThePEG {
/**
* AlphaSBase is an abstract base class used by the StandardModelBase
* to implement the QCD coupling, \f$\alpha_S\f$. The AlphaSBase also
* encodes the number of active flavours at a given scale and the
* \f$\Lambda_{QCD}\f$ for a given number of active flavours or for a
* given scale.
*
* @see \ref AlphaSBaseInterfaces "The interfaces"
* defined for AlphaSBase.
* @see StandardModelBase
*/
class AlphaSBase: public RunningCoupling {
public:
/** @name Virtual functions to be overridden by sub-classes. */
//@{
/**
* 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 = 0;
/**
* Return the \f$\Lambda_{QCD}\f$ used for different numbers of
* active flavours.
*/
virtual vector<Energy> LambdaQCDs() const = 0;
//@}
/** @name Access information about number of flavours and
\f$\Lambda_{QCD}\f$. */
//@{
/**
* Return the number of avtive quark flavours.
*/
unsigned int Nf(Energy2 scale) const {
unsigned int i = 0;
while ( i < theFlavourThresholds.size() &&
theFlavourThresholds[i] < scale ) ++i;
return i;
}
/**
* Return the \f$\Lambda_{QCD}\f$ used for \a nflav active flavours.
*/
Energy LambdaQCD(unsigned int nflav) const { return theLambdaQCDs[nflav]; }
/**
* Return the \f$\Lambda_{QCD}\f$ used for corresponding given \a scale.
*/
Energy LambdaQCD(Energy2 scale) const { return theLambdaQCDs[Nf(scale)]; }
//@}
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 Standard Interfaced functions. */
//@{
/**
* Initialize this object after the setup phase before saving an
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit();
//@}
private:
/**
* Flavour thresholds, set from the virtual functions in the
* initialization.
*/
vector<Energy2> theFlavourThresholds;
/**
* The values of \f$\Lambda_{QCD}\f$ corresponding to
* theFlavourThresholds, set from the virtual functions in the
* initialization.
*/
vector<Energy> theLambdaQCDs;
private:
/**
* Describe an abstract class with persistent data.
*/
static AbstractClassDescription<AlphaSBase> initAlphaSBase;
/**
* Private and non-existent assignment operator.
*/
AlphaSBase & operator=(const AlphaSBase &);
};
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the base classes
* of AlphaSBase. */
template <>
struct BaseClassTrait<AlphaSBase,1>: public ClassTraitsType {
/** Typedef of the first base class of AlphaSBase. */
typedef RunningCoupling NthBase;
};
/** This template specialization informs ThePEG about the name of the
* AlphaSBase class. */
template <>
struct ClassTraits<AlphaSBase>: public ClassTraitsBase<AlphaSBase> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::AlphaSBase"; }
};
/** @endcond */
}
#endif /* ThePEG_AlphaSBase_H */
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