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MEqq2gZ2ll.h
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// -*- C++ -*-
#ifndef ThePEG_MEqq2gZ2ll_H
#define ThePEG_MEqq2gZ2ll_H
//
// This is the declaration of the MEqq2gZ2ll class.
#include "ThePEG/MatrixElement/ME2to2QCD.h"
using namespace ThePEG;
namespace Herwig {
/** \ingroup MatrixElement
* The MEqq2gZ2ll class implements the e+ e- -> gamma/Z0 q qbar
* matrix element. Both the continuum and Z0 pole term as well as
* the interference term is included. Although not a strict QCD
* matrix element the cass inherits from ME2to2Base, mainly to
* inherit the parameter for the number of active quark flavours.
*
* @see ME2to2QCD
*/
class MEqq2gZ2ll: public ME2to2QCD {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* The default constructor.
*/
MEqq2gZ2ll();
/**
* The copy constructor.
*/
MEqq2gZ2ll(const MEqq2gZ2ll &);
/**
* The destructor.
*/
virtual ~MEqq2gZ2ll();
//@}
public:
/**
* Return the order in \f$\alpha_S\f$ in which this matrix element
* is given.
*/
virtual unsigned int orderInAlphaS() const;
/**
* Return the order in \f$\alpha_{EM}\f$ in which this matrix
* element is given. Returns 0.
*/
virtual unsigned int orderInAlphaEW() const;
/**
* Return the matrix element for the kinematical configuation
* previously provided by the last call to setKinematics().
*/
virtual double me2() const;
/**
* Add all possible diagrams with the add() function.
*/
virtual void getDiagrams() const;
/**
* Return a Selector with possible colour geometries for the selected
* diagram weighted by their relative probabilities.
*/
virtual Selector<const ColourLines *>
colourGeometries(tcDiagPtr diag) const;
/**
* Weight the given diagrams with their relative probabilities.
*/
virtual Selector<DiagramIndex> diagrams(const DiagramVector &) const;
/**
* Return the scale associated with the last set phase space point.
*/
virtual Energy2 scale() 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.
*/
inline 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.
*/
inline virtual IBPtr fullclone() const;
//@}
/**
* Standard Interfaced virtual functions.
*/
virtual void doinit() throw(InitException);
protected:
/**
* Constants for the different terms set from the StandardModel in
* the init() function.
*/
vector<double> coefs;
/**
* The mass squared of the \f$Z^0\f$.
*/
Energy2 mZ2;
/**
* The width squared of the \f$Z^0\f$.
*/
Energy2 GZ2;
/**
* The last continuum term to be used to select primary diagram.
*/
mutable double lastCont;
/**
* The last Breit-Wigner term to be used to select primary diagram.
*/
mutable double lastBW;
private:
/**
* Describe a class with persistent data.
*/
static ClassDescription<MEqq2gZ2ll> initMEqq2gZ2ll;
/**
* Private and non-existent assignment operator.
*/
MEqq2gZ2ll & operator=(const MEqq2gZ2ll &);
};
}
namespace ThePEG {
/**
* This template specialization informs ThePEG about the base class of
* MEBase.
*/
template <>
struct BaseClassTrait<Herwig::MEqq2gZ2ll,1> {
/** Typedef of the base class of MEqq2gZ2ll. */
typedef ME2to2QCD NthBase;
};
/**
* This template specialization informs ThePEG about the name of the
* MEBase class.
*/
template <>
struct ClassTraits<Herwig::MEqq2gZ2ll>
: public ClassTraitsBase<Herwig::MEqq2gZ2ll> {
/** Return the class name. */
static string className() { return "Herwig++::MEqq2gZ2ll"; }
/** Return the name of the shared library be loaded to get
* access to the WeakPartonicDecayer class and every other class it uses
* (except the base class). */
static string library() { return "HwME.so"; }
};
}
#include "MEqq2gZ2ll.icc"
#endif /* ThePEG_MEqq2gZ2ll_H */

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