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QuarkoniumDecayer.h
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// -*- C++ -*-
#ifndef HERWIG_QuarkoniumDecayer_H
#define HERWIG_QuarkoniumDecayer_H
//
// This is the declaration of the QuarkoniumDecayer class.
//
#include <ThePEG/Config/ThePEG.h>
#include <ThePEG/PDT/Decayer.h>
#include <ThePEG/Handlers/HandlerBase.h>
#include <ThePEG/Interface/Interfaced.h>
#include <ThePEG/PDT/DecayMode.h>
#include <ThePEG/Repository/Strategy.fh>
#include "DecayConfig.h"
#include "Herwig++/Utilities/GlobalParameters.h"
#include <fstream>
namespace Herwig {
using namespace ThePEG;
/** \ingroup Decay
*
* <code>QuarkoniumDecayer</code> is a class that defines all the general routines
* used in HERWIG++ to imitate the HERWIG 6.4 decays. The goal is to have an exact
* copy of HERWIG 6.4 decay routines. This will allow for easy 'callibration'
* of the new C++ code with the old Fortran code.
*
* This particular class is designed for the partonic decay of bottom and charmonium
* resonances. In general it is used for decays of the type:
* - \f$q,\bar{q}\f$ decay to a quark-antiquark pair generally using phase space,
* \e i.e. MECode=0.
*
* - \f$g,g\f$ decay to two gluons normally using phase space,
* \e i.e. MECode=0.
*
* - \f$g,g,g\f$ decay to three gluons, this will normally use the Ore-Powell
* matrix element, \e i.e. MECode=130.
*
* - \f$g,g,\gamma\f$ decay to two gluons and a photon, this will normally use
* the Ore-Powell matrix element, \e i.e. MECode=130.
*
*
* This class supports two values of the MECode variable which can be set using
* the interface
*
* - MECode=0 flat-phase space
* - MECode=130 The Ore-Powell onium matrix element.
*
* The Ore-Powell matrix element is only for a three-body decay and this
* class only supports two and three body phase-space decays.
*
* @see HeavyDecayer
* @see Hw64Decayer
* @see Decayer
*
*/
class QuarkoniumDecayer: public Decayer {
public:
/**
* Standard ctors and dtor
*/
inline QuarkoniumDecayer();
/**
* Standard ctors and dtor
*/
inline QuarkoniumDecayer(const QuarkoniumDecayer &);
/**
* Standard ctors and dtor
*/
virtual ~QuarkoniumDecayer();
public:
/**
* return true if this decayer can perfom the decay specified by the
* given decay mode.
*/
virtual bool accept(const DecayMode &) const;
/**
* for a given decay mode and a given particle instance, perform the
* decay and return the decay products.
*/
virtual ParticleVector decay(const DecayMode &, const Particle &) const;
/**
* Standard Init function used to initialize the interface.
*/
static void Init();
/**
* Standard Interfaced virtual functions
*/
inline virtual void doupdate() throw(UpdateException);
/**
* Standard Interfaced virtual functions
*/
inline virtual void doinit() throw(InitException);
/**
* Standard Interfaced virtual functions
*/
inline virtual void dofinish();
/**
* Standard Persisten stream methods
*/
void persistentOutput(PersistentOStream &) const;
/**
* Standard Persisten stream methods
*/
void persistentInput(PersistentIStream &, int);
/**
* Standard clone methods
*/
protected:
inline virtual IBPtr clone() const;
/**
* Standard clone methods
*/
inline virtual IBPtr fullclone() const;
/**
* Change all pointers of Interfaced objects to corresponding clones
*/
inline virtual void rebind(const TranslationMap &trans)
throw(RebindException);
/**
* Return pointers to all interfaced objects referred to by this class.
*/
inline virtual IVector getReferences();
private:
/**
* The code for the type of matrix element being used.
*/
int MECode;
/**
* A pointer to the global parameters object/
*/
Ptr<GlobalParameters>::pointer global;
/**
* Describe a concrete class with persistant decay
*/
static ClassDescription<QuarkoniumDecayer> initQuarkoniumDecayer;
/**
* Variable which control the adding of handlers, no longer used
*/
static long lastAddedNumber;
/**
* Private and non-existent assignment operator.
*/
const QuarkoniumDecayer & operator=(const QuarkoniumDecayer &);
};
}
namespace ThePEG {
/**
* This template specialization informs ThePEG about the base class of
* QuarkoniumDecayer.
*/
template <>
struct BaseClassTrait<Herwig::QuarkoniumDecayer,1> {
/** Typedef of the base class of QuarkoniumDecayer. */
typedef HandlerBase NthBase;
};
/**
* This template specialization informs ThePEG about the name of the
* QuarkoniumDecayer class.
*/
template <>
struct ClassTraits<Herwig::QuarkoniumDecayer>: public ClassTraitsBase<Herwig::QuarkoniumDecayer> {
/** Return the class name. */
static string className() { return "Herwig++::QuarkoniumDecayer"; }
/** Return the name of the shared library to be loaded to get
* access to this class and every other class it uses
* (except the base class).
*/
static string library() { return "libHwDecay.so"; }
};
}
#include "QuarkoniumDecayer.icc"
#endif /* HERWIG_QuarkoniumDecayer_H */

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