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VVSDecayer.h
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// -*- C++ -*-
#ifndef THEPEG_VVSDecayer_H
#define THEPEG_VVSDecayer_H
//
// This is the declaration of the VVSDecayer class.
//
#include "GeneralTwoBodyDecayer.h"
#include "ThePEG/Helicity/Vertex/Scalar/VVSVertex.h"
#include "ThePEG/Repository/EventGenerator.h"
namespace Herwig {
using namespace ThePEG;
using Helicity::VVSVertexPtr;
/** \ingroup Decay
* The VVSDecayer class implements the decay of a vector to a
* vector and a scalar in a general model. It holds an VVSVertex pointer
* that must be typecast from the VertexBase pointer helid in the
* GeneralTwoBodyDecayer. It implents the virtual functions me2() and
* partialWidth().
*
* @see \ref VVSDecayerInterfaces "The interfaces"
* defined for VVSDecayer.
*/
class VVSDecayer: public GeneralTwoBodyDecayer {
public:
/**
* The default constructor.
*/
VVSDecayer() {}
/** @name Virtual functions required by the Decayer class. */
//@{
/**
* 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;
/**
* Function to return partial Width
* @param inpart The decaying particle.
* @param outa One of the decay products.
* @param outb The other decay product.
*/
virtual Energy partialWidth(PMPair inpart, PMPair outa,
PMPair outb) 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;
/** 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 an
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit();
//@}
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<VVSDecayer> initVVSDecayer;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
VVSDecayer & operator=(const VVSDecayer &);
private:
/**
* Abstract pointer to AbstractVVSVertex
*/
AbstractVVSVertexPtr _abstractVertex;
/**
* Pointer to the perturbative vertex
*/
VVSVertexPtr _perturbativeVertex;
/**
* Spin density matrix
*/
mutable RhoDMatrix _rho;
/**
* Vector wavefunctions
*/
mutable vector<Helicity::VectorWaveFunction> _vectors[2];
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of VVSDecayer. */
template <>
struct BaseClassTrait<VVSDecayer,1> {
/** Typedef of the first base class of VVSDecayer. */
typedef Herwig::GeneralTwoBodyDecayer NthBase;
};
/** This template specialization informs ThePEG about the name of
* the VVSDecayer class and the shared object where it is defined. */
template <>
struct ClassTraits<VVSDecayer>
: public ClassTraitsBase<VVSDecayer> {
/** Return a platform-independent class name */
static string className() { return "Herwig::VVSDecayer"; }
};
/** @endcond */
}
#endif /* THEPEG_VVSDecayer_H */

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