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SMHiggsFermionsDecayer.h
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SMHiggsFermionsDecayer.h
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// -*- C++ -*-
//
// SMHiggsFermionsDecayer.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2007 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_SMHiggsFermionsDecayer_H
#define HERWIG_SMHiggsFermionsDecayer_H
//
// This is the declaration of the SMHiggsFermionsDecayer class.
//
#include "Herwig++/Decay/DecayIntegrator.h"
#include "ThePEG/Helicity/Vertex/AbstractFFSVertex.h"
#include "Herwig++/Decay/DecayPhaseSpaceMode.h"
namespace Herwig {
using namespace ThePEG;
/**
* The SMHiggsFermionsDecayer class is designed to decay the Standard Model Higgs
* to the Standard Model fermions.
*
* @see DecayIntegrator
*/
class SMHiggsFermionsDecayer: public DecayIntegrator {
public:
/**
* The default constructor.
*/
SMHiggsFermionsDecayer();
/**
* Which of the possible decays is required
*/
virtual int modeNumber(bool & , tcPDPtr , const tPDVector & ) const {return -1;}
/**
* Check if this decayer can perfom the decay for a particular mode.
* Uses the modeNumber member but can be overridden
* @param parent The decaying particle
* @param children The decay products
*/
virtual bool accept(tcPDPtr parent, const tPDVector & children) const;
/**
* For a given decay mode and a given particle instance, perform the
* decay and return the decay products. As this is the base class this
* is not implemented.
* @return The vector of particles produced in the decay.
*/
virtual ParticleVector decay(const Particle & parent,const tPDVector & children) const;
/**
* Return the matrix element squared for a given mode and phase-space channel.
* @param ichan The channel we are calculating the matrix element for.
* @param part The decaying Particle.
* @param decay The particles produced in the decay.
* @param meopt Option for the calculation of the matrix element
* @return The matrix element squared for the phase-space configuration.
*/
virtual double me2(const int ichan, const Particle & part,
const ParticleVector & decay, MEOption meopt) const;
/**
* Output the setup information for the particle database
* @param os The stream to output the information to
* @param header Whether or not to output the information for MySQL
*/
virtual void dataBaseOutput(ofstream & os,bool header) 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.
*/
virtual IBPtr clone() const {return new_ptr(*this);}
/** 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 {return new_ptr(*this);}
//@}
protected:
protected:
/** @name Standard Interfaced functions. */
//@{
/**
* Initialize this object after the setup phase before saving an
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit();
/**
* Initialize this object. Called in the run phase just before
* a run begins.
*/
virtual void doinitrun();
//@}
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<SMHiggsFermionsDecayer> initSMHiggsFermionsDecayer;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
SMHiggsFermionsDecayer & operator=(const SMHiggsFermionsDecayer &);
private:
/**
* Pointer to the Higgs vertex
*/
AbstractFFSVertexPtr _hvertex;
/**
* maximum weights for the different decay modes
*/
vector<double> _maxwgt;
/**
* Spin density matrix
*/
mutable RhoDMatrix _rho;
/**
* Scalar wavefunction
*/
mutable ScalarWaveFunction _swave;
/**
* Spinor wavefunction
*/
mutable vector<SpinorWaveFunction> _wave;
/**
* Barred spinor wavefunction
*/
mutable vector<SpinorBarWaveFunction> _wavebar;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of SMHiggsFermionsDecayer. */
template <>
struct BaseClassTrait<Herwig::SMHiggsFermionsDecayer,1> {
/** Typedef of the first base class of SMHiggsFermionsDecayer. */
typedef Herwig::DecayIntegrator NthBase;
};
/** This template specialization informs ThePEG about the name of
* the SMHiggsFermionsDecayer class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::SMHiggsFermionsDecayer>
: public ClassTraitsBase<Herwig::SMHiggsFermionsDecayer> {
/** Return a platform-independent class name */
static string className() { return "Herwig::SMHiggsFermionsDecayer"; }
/** Return the name(s) of the shared library (or libraries) be loaded to get
* access to the SMHiggsFermionsDecayer class and any other class on which it depends
* (except the base class). */
static string library() { return "HwPerturbativeHiggsDecay.so"; }
};
/** @endcond */
}
#endif /* HERWIG_SMHiggsFermionsDecayer_H */

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