/usr/include/ThePEG/PDT/FlatDecayer.h is in libthepeg-dev 1.8.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | // -*- C++ -*-
//
// 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 */
|