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// -*- C++ -*-
//
// WidthGenerator.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_WidthGenerator_H
#define ThePEG_WidthGenerator_H
// This is the declaration of the WidthGenerator class.
#include "ThePEG/Config/ThePEG.h"
#include "WidthGenerator.fh"
#include "ThePEG/Interface/Interfaced.h"
#include "ThePEG/Utilities/Selector.h"
#include "ThePEG/PDT/DecayMode.fh"
namespace ThePEG {
/**
* WidthGenerator is an abstract base class to be used to encapsulate
* models for giving the partial decay width of a ParticleData given
* the specified DecayModes.
*
* @see \ref WidthGeneratorInterfaces "The interfaces"
* defined for WidthGenerator.
* @see ParticleData
* @see DecayMode
*/
class WidthGenerator: public Interfaced {
public:
/** A selector of <code>DecayModes</code>s weighted by their
* branching ratios. */
typedef Selector<tDMPtr> DecayMap;
public:
/** @name Virtual functions to be overridden by sub-classes. */
//@{
/**
* Return true if this object can be used for the given particle
* type with the given decay map.
*/
virtual bool accept(const ParticleData &) const = 0;
/**
* Given a Particle, calculate a width.
*/
Energy width(const Particle &) const;
/**
* Given a particle type and a mass of an instance of that particle
* type, calculate a width.
*/
virtual Energy width(const ParticleData &, Energy m) const = 0;
/**
* Given a particle type and a mass and a width of an instance of
* that particle type, generate a life time.
*/
virtual Length lifeTime(const ParticleData &, Energy m, Energy w) const;
/**
* Return decay map for the given particle type.
*/
virtual DecayMap rate(const ParticleData &) const = 0;
/**
* Return a decay map for a given Particle instance.
*/
virtual DecayMap rate(const Particle &);
//@}
public:
/**
* Standard Init function used to initialize the interface.
*/
static void Init();
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is an abstract class without persistent data.
*/
static AbstractNoPIOClassDescription<WidthGenerator> initWidthGenerator;
/**
* Private and non-existent assignment operator.
*/
WidthGenerator & operator=(const WidthGenerator &);
};
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the base classes
* of WidthGenerator. */
template <>
struct BaseClassTrait<WidthGenerator,1>: public ClassTraitsType {
/** Typedef of the first base class of WidthGenerator. */
typedef Interfaced NthBase;
};
/** This template specialization informs ThePEG about the name of the
* WidthGenerator class. */
template <>
struct ClassTraits<WidthGenerator>: public ClassTraitsBase<WidthGenerator> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::WidthGenerator"; }
};
/** @endcond */
}
#endif /* ThePEG_WidthGenerator_H */
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