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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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