/usr/include/ThePEG/PDT/V2PPDecayer.h is in libthepeg-dev 1.8.0-3build1.
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//
// V2PPDecayer.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_V2PPDecayer_H
#define THEPEG_V2PPDecayer_H
// This is the declaration of the V2PPDecayer class.
#include "ThePEG/PDT/FlatDecayer.h"
namespace ThePEG {
/**
* The V2PPDecayer class performs the decay of a vector meson into two
* pseudo-scalars according to a flat phase space. If, however the
* decaying particle comes from a pseudo-scalar and has only one
* sibling which is a pseudo-scalar (or a photon) the decay is
* reweighted with \f$\cos^2\f$ (\f$\sin^2\f$ for photon) of the angle
* between one of the decay products and its grand parent.
*
* @see \ref V2PPDecayerInterfaces "The interfaces"
* defined for V2PPDecayer.
* @see FlatDecayer
* @see ParticleData
*/
class V2PPDecayer: public FlatDecayer {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* Destructor.
*/
virtual ~V2PPDecayer();
//@}
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.
*/
virtual double reweight(const DecayMode & dm, const Particle & parent,
const ParticleVector & children) const;
//@}
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 interfaces.
*/
static void Init();
protected:
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 grand parent in case reweighting should be done.
*/
mutable tPPtr grandParent;
/**
* The decaying particles sibling in case reweighting should be done.
*/
mutable tPPtr sibling;
private:
/**
* Describe a concrete class with persistent data.
*/
static ClassDescription<V2PPDecayer> initV2PPDecayer;
/**
* Private and non-existent assignment operator.
*/
V2PPDecayer & operator=(const V2PPDecayer &);
};
}
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the base classes
* of V2PPDecayer. */
template <>
struct BaseClassTrait<V2PPDecayer,1>: public ClassTraitsType {
/** Typedef of the first base class of . */
typedef FlatDecayer NthBase;
};
/** This template specialization informs ThePEG about the name of the
* V2PPDecayer class and the shared object where it is
* defined. */
template <>
struct ClassTraits<V2PPDecayer>
: public ClassTraitsBase<V2PPDecayer> {
/** Return a platform-independent class name */
static string className() { return "ThePEG::V2PPDecayer"; }
/** Return the name of the shared library be loaded to get access to
* the V2PPDecayer class and every other class it uses
* (except the base class). */
static string library() { return "V2PPDecayer.so"; }
};
/** @endcond */
}
#endif /* THEPEG_V2PPDecayer_H */
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