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SMHiggsWWDecayer.h
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// -*- C++ -*-
//
// SMHiggsWWDecayer.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_SMHiggsWWDecayer_H
#define HERWIG_SMHiggsWWDecayer_H
//
// This is the declaration of the SMHiggsWWDecayer class.
//
#include "Herwig++/Decay/DecayIntegrator.h"
#include "Herwig++/Decay/DecayPhaseSpaceMode.h"
#include "ThePEG/Helicity/Vertex/AbstractFFVVertex.fh"
#include "ThePEG/Helicity/Vertex/AbstractVVSVertex.fh"
#include "ThePEG/Helicity/WaveFunction/ScalarWaveFunction.h"
#include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
#include "Herwig++/PDT/SMHiggsWidthGenerator.h"
namespace Herwig {
using namespace ThePEG;
using namespace ThePEG::Helicity;
/**
* The SMHiggsWWDecayer class performs the decay of the Standard Model
* Higgs boson to \f$W^+W^-\f$ and \f$Z^0Z^0\f$ including the decays
* of the gauge bosons.
*
* @see \ref SMHiggsWWDecayerInterfaces "The interfaces"
* defined for SMHiggsWWDecayer.
*/
class SMHiggsWWDecayer: public DecayIntegrator {
public:
/**
* A typedef to select the boson decay modes
*/
typedef Selector<unsigned int> ModeSelector;
public:
/**
* The default constructor.
*/
SMHiggsWWDecayer();
/**
* 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;
/**
* Which of the possible decays is required
*/
virtual int modeNumber(bool &, tcPDPtr, const tPDVector & ) const {return -1;}
/**
* 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:
/** @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() throw(InitException);
/**
* 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<SMHiggsWWDecayer> initSMHiggsWWDecayer;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
SMHiggsWWDecayer & operator=(const SMHiggsWWDecayer &);
private:
/**
* Pointers to the vertices for the helicity calculations
*/
//@{
/**
* Pointer to the fermion-femion-W vertex
*/
AbstractFFVVertexPtr _theFFWVertex;
/**
* Pointer to the fermion-femion-Z vertex
*/
AbstractFFVVertexPtr _theFFZVertex;
/**
* Pointer to the higgs-WW/ZZ vertex
*/
AbstractVVSVertexPtr _theHVVVertex;
//@}
/**
* Pointer to the width generator for the Higgs
*/
SMHiggsWidthGeneratorPtr _hwidth;
/**
* Selectors for the gauge boson decay modes
*/
//@{
/**
* Selector for the W decays
*/
ModeSelector _wdecays;
/**
* Selector for the Z decays
*/
ModeSelector _zdecays;
//@}
/**
* Product of gauge boson branching ratios for normalisation
*/
vector<double> _ratio;
/**
* Maximum weights for the decays
*/
//@{
/**
* Maximum weight for \f$H\to W^+W^-\f$ decays
*/
vector<double> _wmax;
/**
* Maximum weight for \f$H\to Z^0Z^0\f$ decays
*/
vector<double> _zmax;
//@}
/**
* Spin density matrix
*/
mutable RhoDMatrix _rho;
/**
* Scalar wavefunction
*/
mutable ScalarWaveFunction _swave;
/**
* 1st spinor wavefunction
*/
mutable vector<SpinorWaveFunction > _awave1;
/**
* 2nd spinor wavefunction
*/
mutable vector<SpinorWaveFunction > _awave2;
/**
* 1st barred spinor wavefunction
*/
mutable vector<SpinorBarWaveFunction> _fwave1;
/**
* 2nd barred spinor wavefunction
*/
mutable vector<SpinorBarWaveFunction> _fwave2;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of SMHiggsWWDecayer. */
template <>
struct BaseClassTrait<Herwig::SMHiggsWWDecayer,1> {
/** Typedef of the first base class of SMHiggsWWDecayer. */
typedef Herwig::DecayIntegrator NthBase;
};
/** This template specialization informs ThePEG about the name of
* the SMHiggsWWDecayer class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::SMHiggsWWDecayer>
: public ClassTraitsBase<Herwig::SMHiggsWWDecayer> {
/** Return a platform-independent class name */
static string className() { return "Herwig::SMHiggsWWDecayer"; }
/**
* The name of a file containing the dynamic library where the class
* SMHiggsWWDecayer is implemented. It may also include several, space-separated,
* libraries if the class SMHiggsWWDecayer depends on other classes (base classes
* excepted). In this case the listed libraries will be dynamically
* linked in the order they are specified.
*/
static string library() { return "HwPerturbativeHiggsDecay.so"; }
};
/** @endcond */
}
#endif /* HERWIG_SMHiggsWWDecayer_H */

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