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VectorMesonDecayerBase.h
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VectorMesonDecayerBase.h
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// -*- C++ -*-
#ifndef HERWIG_VectorMesonDecayerBase_H
#define HERWIG_VectorMesonDecayerBase_H
//
// This is the declaration of the VectorMesonDecayerBase class.
//
#include "Herwig++/Decay/DecayPhaseSpaceMode.h"
#include "Herwig++/Decay/DecayIntegrator.h"
#include "ThePEG/Helicity/LorentzPolarizationVector.h"
namespace Herwig {
using namespace ThePEG;
using ThePEG::Helicity::LorentzPolarizationVector;
/** \ingroup Decay
*
* This class is designed to be the base class for the HERWIG++ decays of
* vector mesons. It handles the generation of the phase space and the calculation
* of the matrix element. All the implementations should inherit from this class
* and implement the decayCurrent method to return the current for a given
* phase space point. This current is then contracted with the polarization
* vectors for the decaying meson.
*
* It uses the DecayIntegrator class for the phase space and implements the
* me2 member of the DecayIntegrator to give the matrix element as
*
* \f[ \mathcal{M} = \epsilon^\mu J_\mu \f]
*
* where \f$\epsilon^\mu\f$ is the polarization vector of the decaying vector
* meson and \f$J_\mu\f$ is the hadronic current supplied by the decayCurrent member.
*
* @see DecayIntegrator
*
* \author Peter Richardson
*/
class VectorMesonDecayerBase: public DecayIntegrator {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* Default constructor.
*/
inline VectorMesonDecayerBase();
/**
* Copy-constructor.
*/
inline VectorMesonDecayerBase(const VectorMesonDecayerBase &);
/**
* Destructor.
*/
virtual ~VectorMesonDecayerBase();
//@}
public:
/**
* The hadronic current. This must be implemented in all classes inheriting from
* this one and is therefore purely virtual. The currents should be specified so
* that the spin of the first outgoing particle is interated over first, then
* then second particle and so on.
* @param vertex Construct the information for spin correlations.
* @param ichan The phase-space channel to calculate the current for.
* @param inpart The decaying particle
* @param outpart The decay products
* @return The hadronic currents for the decay.
*/
virtual vector<LorentzPolarizationVector>
decayCurrent(const bool vertex, const int ichan,const Particle & inpart,
const ParticleVector & outpart) const =0;
/**
* 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();
protected:
/** @name Standard Interfaced functions. */
//@{
/**
* Check sanity of the object during the setup phase.
*/
inline virtual void doupdate() throw(UpdateException);
/**
* Initialize this object after the setup phase before saving and
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
inline virtual void doinit() throw(InitException);
/**
* Initialize this object to the begining of the run phase.
*/
inline virtual void doinitrun();
/**
* Finalize this object. Called in the run phase just after a
* run has ended. Used eg. to write out statistics.
*/
inline virtual void dofinish();
/**
* Rebind pointer to other Interfaced objects. Called in the setup phase
* after all objects used in an EventGenerator has been cloned so that
* the pointers will refer to the cloned objects afterwards.
* @param trans a TranslationMap relating the original objects to
* their respective clones.
* @throws RebindException if no cloned object was found for a given pointer.
*/
inline virtual void rebind(const TranslationMap & trans)
throw(RebindException);
/**
* Return a vector of all pointers to Interfaced objects used in
* this object.
* @return a vector of pointers.
*/
inline virtual IVector getReferences();
//@}
private:
/**
* Describe an abstract base class with persistent data.
*/
static AbstractClassDescription<VectorMesonDecayerBase> initVectorMesonDecayerBase;
/**
* Private and non-existent assignment operator.
*/
VectorMesonDecayerBase & operator=(const VectorMesonDecayerBase &);
};
}
namespace ThePEG {
/**
* The following template specialization informs ThePEG about the
* base class of VectorMesonDecayerBase.
*/
template <>
struct BaseClassTrait<Herwig::VectorMesonDecayerBase,1> {
/** Typedef of the base class of VectorMesonDecayerBase. */
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::VectorMesonDecayerBase>
: public ClassTraitsBase<Herwig::VectorMesonDecayerBase> {
/** Return the class name. */
static string className() { return "Herwig++::VectorMesonDecayerBase"; }
/**
* 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"; }
};
}
#include "VectorMesonDecayerBase.icc"
#ifndef ThePEG_TEMPLATES_IN_CC_FILE
// #include "VectorMesonDecayerBase.tcc"
#endif
#endif /* HERWIG_VectorMesonDecayerBase_H */

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