/usr/include/ThePEG/PDT/FlatDecayer.h is in libthepeg-dev 1.8.0-1.1.
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//
// FlatDecayer.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_FlatDecayer_H
#define ThePEG_FlatDecayer_H
// This is the declaration of the FlatDecayer class.
#include "ThePEG/PDT/Decayer.h"
namespace ThePEG {
/**
* The FlatDecayer class inrerits from the abstract Decayer class and
* implements the decay of a given Particle to a given set of children
* according to a flat phase space distribution.
*
* It is possible to implement a more complicated decay distribution
* by inheriting from the FlatDecayer class and only override the
* virtual function reweight() to return a weight (between zero and
* one) of a given phase space point relative to the flat
* distribution.
*
* @see \ref FlatDecayerInterfaces "The interfaces"
* defined for FlatDecayer.
* @see Decayer
* @see Particle
*/
class FlatDecayer: public Decayer {
public:
/** @name Virtual functions required by the Decayer class.
*/
//@{
/**
* Check if this decayer can perfom the decay specified by the
* given decay mode.
* @param dm the DecayMode describing the decay.
* @return true if this decayer can handle the given mode, otherwise false.
*/
virtual bool accept(const DecayMode & dm) const;
/**
* Perform a decay for a given DecayMode and a given Particle instance.
* @param dm the DecayMode describing the decay.
* @param p the Particle instance to be decayed.
* @return a ParticleVector containing the decay products.
*/
virtual ParticleVector decay(const DecayMode & dm, const Particle & p) const;
/**
* Give a weight to a phase space point. To be overridden by
* subclasses. For a given decay mode, \a dm, decaying \a parent
* particle and decayproducts, \a children, distributed according to
* a flat distribution in phase space, return a weight (less or
* equal to unity) modifying the flat distribution to the desired
* one. Note that the chosen phase space point may be rejected, but
* the chosen decay channel will not. This means that the weight
* returned by this function does not influence the branching
* ratios. For the FlatDecayer class this function simply returns 1.
*/
virtual double reweight(const DecayMode &, const Particle & ,
const ParticleVector & ) const {
return 1.0;
}
//@}
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<FlatDecayer> initFlatDecayer;
/**
* Private and non-existent assignment operator.
*/
FlatDecayer & operator=(const FlatDecayer &);
};
}
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the base classes
* of FlatDecayer. */
template <>
struct BaseClassTrait<FlatDecayer,1>: public ClassTraitsType {
/** Typedef of the first base class of FlatDecayer. */
typedef Decayer NthBase;
};
/** This template specialization informs ThePEG about the name of the
* FlatDecayer class. */
template <>
struct ClassTraits<FlatDecayer>: public ClassTraitsBase<FlatDecayer> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::FlatDecayer"; }
};
/** @endcond */
}
#endif /* ThePEG_FlatDecayer_H */
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