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GenericWidthGenerator.h
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GenericWidthGenerator.h
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// -*- C++ -*-
#ifndef HERWIG_GenericWidthGenerator_H
#define HERWIG_GenericWidthGenerator_H
//
// This is the declaration of the GenericWidthGenerator class.
//
#include "ThePEG/PDT/WidthGenerator.h"
#include "ThePEG/PDT/ParticleData.h"
#include "ThePEG/PDT/DecayMode.h"
#include "GenericWidthGenerator.fh"
#include "Herwig++/Decay/DecayIntegrator.h"
#include "Herwig++/Decay/DecayPhaseSpaceMode.h"
#include "Herwig++/Utilities/Interpolator.h"
#include "GenericMassGenerator.h"
#include <iostream>
namespace Herwig {
using namespace ThePEG;
/** \ingroup PDT
*
* The <code>GenericWidthGenerator</code> class is designed to automatically
* calculate the running width for a given particle using information from
* the decayModes and the Decayers to construct the running width.
*
* It also gives us the option of selecting the decay modes for a particle
* based on the mass.
*
* @see WidthGenerator
* @see DecayIntegrator
* @see GenericMassGenerator
*/
class GenericWidthGenerator: public WidthGenerator {
public:
/**
* A friend class so the off-shell matrix elements can be integrated.
*/
friend class TwoBodyAllOnCalculator;
public:
/**
* Default constructor
*/
inline GenericWidthGenerator();
/** @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();
public:
/**
* Return true if this width generator can handle the given particle type.
* @param part The particle data pointer of the particle.
* @return True if this class can handle the particle and false otherwise
*/
virtual bool accept(const ParticleData & part) const;
/** @name Members to calculate the width and decay modes. */
//@{
/**
* Calculate the width.
* @param part The particle data pointer of the particle.
* @param m The scale for the width calculation
* @return The width at the mass given.
*/
virtual Energy width(const ParticleData & part, Energy m) const;
/**
* Initialize the given decay map for the given particle type.
* @param part The particle data pointer of the particle.
* @return The decay map
*/
virtual DecayMap rate(const ParticleData & part) const;
/**
* Return a decay map for a given particle instance. This allows us to
* vary the branching ratios as a function of the particles mass.
* @param part The particle instance
* @return The decay map
*/
virtual DecayMap rate (const Particle & part);
/**
* The partial width for a given mode
* @param m The mass, or scale, for the calculation
* @param iloc The location of the mode in the list
* @return The partial width for the mode.
*/
Energy partialWidth(int iloc,Energy m) const;
//@}
/**
* Output the initialisation info for the database
* @param output The stream to output the information to
* @param header output the header.
**/
virtual void dataBaseOutput(ofstream & output, bool header=true);
protected:
/**
* The \f$1\to2\f$ width for on-shell particles
* @param m The mass, or scale, for the calculation
* @param iloc The location of the mode in the list.
* @return The partial width.
*/
inline Energy partial2BodyWidth(int iloc,Energy m) const;
/**
* The \f$1\to2\f$ width for outgoing particles which can be off-shell.
* @param iloc The location of the mode in the list.
* @param m0 The mass of the decaying particle.
* @param m1 The mass of the first outgoing particle.
* @param m2 The mass of the second outgoing particle.
* @return The partial width.
*/
inline virtual Energy partial2BodyWidth(int iloc,Energy m0,Energy m1,Energy m2) const;
/**
* Perform the set up for a mode in classes inheriting from this one
* @param mode The decay mode
* @param decayer The decayer for the mode.
* @param imode The number of the mode.
*/
virtual void setupMode(tcDMPtr mode, tDecayIntegratorPtr decayer, unsigned int imode);
/**
* Access to the particle dat for inheriting classes
*/
inline tPDPtr particle() 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);
//@}
/**
* set up the interpolators
*/
void setInterpolators();
/**
* Matrix element code for a given mode
* @param imode The mode.
*/
inline int MEcode(int imode) const;
/**
* Coupling for a given mode
* @param imode The mode.
*/
inline double MEcoupling(int imode) const;
/**
* The on-shell mass of the particle
*/
inline Energy mass() const;
/**
* Initialization option for use by the inheriting classes
*/
inline bool initialize() const;
private:
/**
* Describe a concrete class with persistent data.
*/
static ClassDescription<GenericWidthGenerator> initGenericWidthGenerator;
/**
* Private and non-existent assignment operator.
*/
GenericWidthGenerator & operator=(const GenericWidthGenerator &);
private:
/**
* The pointer to the ParticleData object for the particle for this width generator.
*/
PDPtr _theParticle;
/**
* The decaymodes
*/
vector<DMPtr> _decaymodes;
/**
* The minimum mass of the decaying particle for which this decay mode is possible
*/
vector<Energy> _minmass;
/**
* The on-shell mass of the particle
*/
Energy _mass;
/**
* Prefactor to get the on-shell width
*/
double _prefactor;
/**
* The type of ME, whether it is fixed, calculated by this class or interpolation
*/
vector<int> _MEtype;
/**
* The code for the matrix element
*/
vector<int> _MEcode;
/**
* Mass of the first outgoing particle for the simple \f$1\to2\f$ ME's
*/
vector<Energy> _MEmass1;
/**
* Mass of the second outgoing particle for the simple \f$1\to2\f$ ME's
*/
vector<Energy> _MEmass2;
/**
* the coupling for a given me
*/
vector<double> _MEcoupling;
/**
* is this mode used for the running width
*/
vector<bool> _modeon;
/**
* storage of the massesto set up the interpolation tables
*/
vector<Energy> _intermasses;
/**
* storage of the widths to set up the interpolation tables
*/
vector<Energy> _interwidths;
/**
* the number of entries in the decay table for a particular mode
*/
vector<int> _noofentries;
/**
* initialize the generator using the particle data object
*/
bool _initialize;
/**
* normalise the terms so that the partial widths for an on-shell particle are correct
*/
bool _BRnorm;
/**
* number of points to use for interpolation tables
*/
int _npoints;
/**
* intepolators for the running width
*/
vector<Interpolator<Energy,Energy>::Ptr> _interpolators;
/**
* minimum branching ratio for the inclusion in the total running width
*/
double _BRminimum;
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/**
* The following template specialization informs ThePEG about the
* base class of GenericWidthGenerator.
*/
template <>
struct BaseClassTrait<Herwig::GenericWidthGenerator,1> {
/** Typedef of the base class of GenericWidthGenerator. */
typedef WidthGenerator 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::GenericWidthGenerator>
: public ClassTraitsBase<Herwig::GenericWidthGenerator> {
/** Return the class name. */
static string className() { return "Herwig::GenericWidthGenerator"; }
};
/** @endcond */
}
#include "GenericWidthGenerator.icc"
#endif /* HERWIG_GenericWidthGenerator_H */

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