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MamboDecayer.h
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MamboDecayer.h
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// -*- C++ -*-
#ifndef HERWIG_MamboDecayer_H
#define HERWIG_MamboDecayer_H
//
// This is the declaration of the MamboDecayer class.
//
#include "ThePEG/PDT/Decayer.h"
#include "ThePEG/PDT/DecayMode.h"
#include "MamboDecayer.fh"
namespace Herwig {
using namespace ThePEG;
/**
* The MamboDecayer class inherits from the Decayer class in
* ThePEG and implements the algorithm of R.Kleiss and
* W.J.Stirling NPB 385 (1992) 413-432 for massive multi-particle phase-space
* decays
*/
class MamboDecayer: public Decayer {
public:
/**
* The default constructor.
*/
inline MamboDecayer();
/** @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;
//@}
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);
//@}
/**
* The standard Init function used to initialize the interfaces.
* Called exactly once for each class by the class description system
* before the main function starts or
* when this class is dynamically loaded.
*/
static void Init();
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
inline 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.
*/
inline virtual IBPtr fullclone() const;
//@}
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<MamboDecayer> initMamboDecayer;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MamboDecayer & operator=(const MamboDecayer &);
private:
/**
*Set array of mometum to particles
*@param mom Momentum set to be distributed over phase-space
*@param comEn The mass of the decaying particle
*@return The weight of the configuration
**/
double calculateMomentum(vector<Lorentz5Momentum> & mom,
const Energy & comEn) const;
/**
*Bessel function of first kind(n=0)
*@param x Argument of Bessel Function
*@return long double
**/
inline long double BessI0(const long double & x) const;
/**
*Bessel function of first kind(n=1)
*@param x Argument of Bessel Function
*@return long double
**/
inline long double BessI1(const long double & x) const;
/**
*Bessel function of second kind(n=0)
*@param x Argument of Bessel Function
*@return long double
**/
inline long double BessK0(const long double & x) const;
/**
*Bessel function of second kind(n=1)
*@param x Argument of Bessel Function
*@return long double
**/
inline long double BessK1(const long double & x) const;
/**
* Derivative of ratio K0/K1
*@param x Argument of Bessel Function
*@return long double
**/
inline long double BessKPrime(const long double & x) const;
/**
* Maximum weight
*/
double _maxweight;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MamboDecayer. */
template <>
struct BaseClassTrait<Herwig::MamboDecayer,1> {
/** Typedef of the first base class of MamboDecayer. */
typedef Decayer NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MamboDecayer class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MamboDecayer>
: public ClassTraitsBase<Herwig::MamboDecayer> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MamboDecayer"; }
/** Return the name of the shared library be loaded to get
* access to the MamboDecayer class and every other class it uses
* (except the base class). */
static string library() { return "HwMamboDecay.so"; }
};
/** @endcond */
}
#include "MamboDecayer.icc"
#endif /* HERWIG_MamboDecayer_H */

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