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// -*- C++ -*-
//
// SimpleAlphaEM.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_SimpleAlphaEM_H
#define ThePEG_SimpleAlphaEM_H
// This is the declaration of the SimpleAlphaEM class.
#include "AlphaEMBase.h"
namespace ThePEG {
/**
* SimpleAlphaEM inherits from AlphaEMBase and implements a simple
* running of the electromagnetic coupling as parameterized by
* H.~Buckhardt et al.
*
* @see \ref SimpleAlphaEMInterfaces "The interfaces"
* defined for SimpleAlphaEM.
*/
class SimpleAlphaEM: public AlphaEMBase {
public:
/**
* The \f$\alpha_{EM}\f$. Return the value of the coupling at 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; }
public:
/**
* 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:
/**
* Describe a concrete class without persistent data.
*/
static NoPIOClassDescription<SimpleAlphaEM> initSimpleAlphaEM;
/**
* Private and non-existent assignment operator.
*/
SimpleAlphaEM & operator=(const SimpleAlphaEM &);
};
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the base classes
* of SimpleAlphaEM. */
template <>
struct BaseClassTrait<SimpleAlphaEM,1>: public ClassTraitsType {
/** Typedef of the first base class of SimpleAlphaEM. */
typedef AlphaEMBase NthBase;
};
/** This template specialization informs ThePEG about the name of the
* SimpleAlphaEM class and the shared object where it is
* defined. */
template <>
struct ClassTraits<SimpleAlphaEM>: public ClassTraitsBase<SimpleAlphaEM> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::SimpleAlphaEM"; }
/** Return the name of the shared library be loaded to get access to
* the SimpleAlphaEM class and every other class it uses
* (except the base class). */
static string library() { return "SimpleAlphaEM.so"; }
};
/** @endcond */
}
#endif /* ThePEG_SimpleAlphaEM_H */
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