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MEee2VV.h
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// -*- C++ -*-
#ifndef HERWIG_MEee2VV_H
#define HERWIG_MEee2VV_H
//
// This is the declaration of the MEee2VV class.
//
#include "Herwig/MatrixElement/HwMEBase.h"
#include "ThePEG/Helicity/Vertex/AbstractFFVVertex.h"
#include "ThePEG/Helicity/Vertex/AbstractVVVVertex.h"
#include "Herwig/MatrixElement/ProductionMatrixElement.h"
namespace Herwig {
using namespace ThePEG;
/**
* The MEee2VV class implements the matrix elements for
* \f$e^+e^-\to W^+W^-/|^0Z^0\f$.
*
* @see \ref MEee2VVInterfaces "The interfaces"
* defined for MEee2VV.
*/
class MEee2VV: public HwMEBase {
public:
/**
* The default constructor.
*/
MEee2VV();
/** @name Virtual functions required by the MEBase class. */
//@{
/**
* 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$\alpha_{EW}\f$ in which this matrix
* element is given.
*/
virtual unsigned int orderInAlphaEW() const;
/**
* The matrix element for the kinematical configuration
* previously provided by the last call to setKinematics(), suitably
* scaled by sHat() to give a dimension-less number.
* @return the matrix element scaled with sHat() to give a
* dimensionless number.
*/
virtual double me2() const;
/**
* Return the scale associated with the last set phase space point.
*/
virtual Energy2 scale() const;
/**
* Add all possible diagrams with the add() function.
*/
virtual void getDiagrams() const;
/**
* Get diagram selector. With the information previously supplied with the
* setKinematics method, a derived class may optionally
* override this method to weight the given diagrams with their
* (although certainly not physical) relative probabilities.
* @param dv the diagrams to be weighted.
* @return a Selector relating the given diagrams to their weights.
*/
virtual Selector<DiagramIndex> diagrams(const DiagramVector & dv) const;
/**
* Return a Selector with possible colour geometries for the selected
* diagram weighted by their relative probabilities.
* @param diag the diagram chosen.
* @return the possible colour geometries weighted by their
* relative probabilities.
*/
virtual Selector<const ColourLines *>
colourGeometries(tcDiagPtr diag) const;
/**
* Used internally by generateKinematics, after calculating the
* limits on cos(theta).
*/
virtual double getCosTheta(double cthmin, double cthmax, const double r);
/**
* Construct the vertex of spin correlations.
*/
virtual void constructVertex(tSubProPtr);
//@}
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:
/**
* Matrix element for \f$f\bar{f}\to W^+W^-\f$.
* @param f1 Spinors for the incoming fermion
* @param a1 Spinors for the incoming antifermion
* @param v1 Polarization vector for the 1st outgoing boson
* @param v2 Polarization vector for the 2nd outgoing boson
*/
double WWME(vector<SpinorWaveFunction> & f1,
vector<SpinorBarWaveFunction> & a1,
vector<VectorWaveFunction> & v1,
vector<VectorWaveFunction> & v2) const;
/**
* Matrix element for \f$f\bar{f}\to Z^0Z^0\f$.
* @param f1 Spinors for the incoming fermion
* @param a1 Spinors for the incoming antifermion
* @param v1 Polarization vector for the 1st outgoing boson
* @param v2 Polarization vector for the 2nd outgoing boson
*/
double ZZME(vector<SpinorWaveFunction> & f1,
vector<SpinorBarWaveFunction> & a1,
vector<VectorWaveFunction> & v1,
vector<VectorWaveFunction> & v2) 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 an
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit();
//@}
private:
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEee2VV & operator=(const MEee2VV &) = delete;
private:
/**
* Vertices
*/
//@{
/**
* FFPVertex
*/
AbstractFFVVertexPtr FFPvertex_;
/**
* FFWVertex
*/
AbstractFFVVertexPtr FFWvertex_;
/**
* FFZVertex
*/
AbstractFFVVertexPtr FFZvertex_;
/**
* WWW Vertex
*/
AbstractVVVVertexPtr WWWvertex_;
//@}
/**
* Processes
*/
unsigned int process_;
/**
* Treatment of the the W and Z masses
*/
unsigned int massOption_;
/**
* The matrix element
*/
mutable ProductionMatrixElement me_;
};
}
#endif /* HERWIG_MEee2VV_H */

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