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PVectorMesonVectorPScalarDecayer.h
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PVectorMesonVectorPScalarDecayer.h
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// -*- C++ -*-
//
// PVectorMesonVectorPScalarDecayer.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_PVectorMesonVectorPScalarDecayer_H
#define HERWIG_PVectorMesonVectorPScalarDecayer_H
//
// This is the declaration of the PVectorMesonVectorPScalarDecayer class.
//
#include "Herwig++/Decay/DecayIntegrator.h"
#include "Herwig++/Decay/DecayPhaseSpaceMode.h"
#include "PVectorMesonVectorPScalarDecayer.fh"
namespace Herwig {
using namespace ThePEG;
/** \ingroup Decay
*
* This class is designed for the decay of a pseudovector meson to a spin-1
* particle, either a vector meson or a photon, and a pseudoscalar meson.
* The current for the decay is
*
* \f[\mathcal{M}=g\epsilon_mu\left[ p_V \cdot p_0 \epsilon_V^\mu
* -p_V^\mu \epsilon_V \cdot p_0\right],\f]
* where \f$\epsilon\f$ is the polarization vector of the decaying pseudo-vector
* meson, \f$\epsilon_V\f$ is the polarization vector of the outgoing vector meson,
* \f$p_0\f$ is the momentum of the decaying particle and \f$p_V\f$ is the momentum
* of the outgoing vector meson.
*
* @see DecayIntegrator
* @see \ref PVectorMesonVectorPScalarDecayerInterfaces "The interfaces"
* defined for PVectorMesonVectorPScalarDecayer.
*
* \author Peter Richardson
*
*/
class PVectorMesonVectorPScalarDecayer: public DecayIntegrator {
public:
/**
* Default constructor.
*/
PVectorMesonVectorPScalarDecayer();
/**
* Which of the possible decays is required
* @param cc Is this mode the charge conjugate
* @param parent The decaying particle
* @param children The decay products
*/
virtual int modeNumber(bool & cc, tcPDPtr parent,
const PDVector & children) const;
/**
* Return the matrix element squared for a given mode and phase-space channel.
* @param vertex Output the information on the vertex for spin correlations
* @param ichan The channel we are calculating the matrix element for.
* @param part The decaying Particle.
* @param decay The particles produced in the decay.
* @return The matrix element squared for the phase-space configuration.
*/
double me2(bool vertex, const int ichan,const Particle & part,
const ParticleVector & decay) 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);
//@}
/**
* Standard Init function used to initialize the interfaces.
*/
static void Init();
/**
* Specify the \f$1\to2\f$ matrix element to be used in the running width calculation.
* @param dm The DecayMode
* @param mecode The code for the matrix element as described
* in the GenericWidthGenerator class, in this case 4.
* @param coupling The coupling for the matrix element.
* @return True or False if this mode can be handled.
*/
bool twoBodyMEcode(const DecayMode & dm, int & mecode, double & coupling) const;
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;
//@}
protected:
/** @name Standard Interfaced functions. */
//@{
/**
* Initialize this object after the setup phase before saving and
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit() throw(InitException);
/**
* Initialize this object to the begining of the run phase.
*/
inline virtual void doinitrun();
//@}
private:
/**
* Describe a concrete class with persistent data.
*/
static ClassDescription<PVectorMesonVectorPScalarDecayer> initPVectorMesonVectorPScalarDecayer;
/**
* Private and non-existent assignment operator.
*/
PVectorMesonVectorPScalarDecayer & operator=(const PVectorMesonVectorPScalarDecayer &);
private:
/**
* Coupling for a decay
*/
vector<InvEnergy> _coupling;
/**
* PDG codes for the incoming particles
*/
vector<int> _incoming;
/**
* PDG codes for the outgoing vector
*/
vector<int> _outgoingV;
/**
* PDG codes for the outgoing pseudoscalar mesons.
*/
vector<int> _outgoingP;
/**
* maximum weight for a decay
*/
vector<double> _maxweight;
/**
* Initial size of the vectors
*/
unsigned int _initsize;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/**
* The following template specialization informs ThePEG about the
* base class of PVectorMesonVectorPScalarDecayer.
*/
template <>
struct BaseClassTrait<Herwig::PVectorMesonVectorPScalarDecayer,1> {
/** Typedef of the base class of PVectorMesonVectorPScalarDecayer. */
typedef Herwig::DecayIntegrator NthBase;
};
/**
* The following template specialization informs ThePEG about the
* name of this class and the shared object where it is defined.
*/
template <>
struct ClassTraits<Herwig::PVectorMesonVectorPScalarDecayer>
: public ClassTraitsBase<Herwig::PVectorMesonVectorPScalarDecayer> {
/** Return the class name. */
static string className() { return "Herwig::PVectorMesonVectorPScalarDecayer"; }
/**
* 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 "HwVMDecay.so"; }
};
/** @endcond */
}
#include "PVectorMesonVectorPScalarDecayer.icc"
#endif /* HERWIG_PVectorMesonVectorPScalarDecayer_H */

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