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 // -*- C++ -*-
 //
 // MEvv2ss.h is a part of Herwig - A multi-purpose Monte Carlo event generator
 // Copyright (C) 2002-2019 The Herwig Collaboration
 //
 // Herwig is licenced under version 3 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 #ifndef HERWIG_MEvv2ss_H
 #define HERWIG_MEvv2ss_H
 //
 // This is the declaration of the MEvv2ss class.
 //
 
 #include "GeneralHardME.h"
 #include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/ScalarWaveFunction.h"
 #include "ThePEG/Helicity/Vertex/AbstractVVSVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractVSSVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractVVVVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractVVTVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractSSTVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractVVSSVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractSSSVertex.h"
 #include "Herwig/MatrixElement/ProductionMatrixElement.h"
 
 namespace Herwig {
 using namespace ThePEG;
 using ThePEG::Helicity::VectorWaveFunction;
 using ThePEG::Helicity::ScalarWaveFunction;
 
 /**
  * This is the implementation of the matrix element for the process
  * vector-vector to scalar-scalar. It inherits from GeneralHardME and
  * implements the required virtual functions.
  *
  * @see \ref MEff2ffInterfaces "The Interfaces"
  * defined for MEff2ff.
  * @see GeneralHardME
  */
 class MEvv2ss: public GeneralHardME {
 
 public:
 
   /** A vector of VectorWaveFunction objects*/
   typedef vector<VectorWaveFunction> VBVector;
 
 public:
 
   /** @name Virtual functions required by the MEBase class. */
   //@{
   /**
    * 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;
   //@}
 
   /**
    * Set the Hardvertex for the spin correlations
    * @param sub
    */
   virtual void constructVertex(tSubProPtr sub);
 
 private:
 
   /**
    * Calculate the matrix element.
    * @param v1 A vector of VectorWaveFunction objects for the first boson
    * @param v2 A vector of VectorWaveFunction objects for the second boson
    * @param sca1 A ScalarWaveFunction for the first outgoing
    * @param sca2 A ScalarWaveFunction for the second outgoing
    * @param me2 The value of the spin-summed matrix element squared
    * (to be calculated)
    * @param first Whether or not first call to decide if colour decomposition etc
    * should be calculated
    */
   ProductionMatrixElement vv2ssME(const VBVector & v1, const VBVector & v2,
                   const ScalarWaveFunction & sca1, 
                   const ScalarWaveFunction & sca2, 
                   double & me2, bool first) const;
 protected:
   
   /**
    * A debugging function to test the value of me2 against an
    * analytic function.
    * @param me2 The value of the \f$ |\bar{\mathcal{M}}|^2 \f$
    */
   virtual void debug(double me2) 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 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();
   //@}
 
 
 protected:
 
   /** @name Clone Methods. */
   //@{
   /**
    * Make a simple clone of this object.
    * @return a pointer to the new object.
    */
   virtual IBPtr clone() const {return new_ptr(*this);}
 
   /** 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 {return new_ptr(*this);}
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   MEvv2ss & operator=(const MEvv2ss &) = delete;
 
 private:
 
   /** @name The dynamically casted vertices. */
   //@{
   /**
    * Intermediate s-channel scalar
    */
   vector<pair<AbstractVVSVertexPtr, AbstractSSSVertexPtr> > scalar1_;
 
   /**
    * Intermediate t-channel scalar
    */
   vector<pair<AbstractVSSVertexPtr, AbstractVSSVertexPtr> > scalar2_;
 
   /**
    * Intermediate t-channel scalar
    */
   vector<pair<AbstractVVSVertexPtr, AbstractVVSVertexPtr> > scalar3_;
 
   /**
    * Intermediate s-channel vector
    */
   vector<pair<AbstractVVVVertexPtr, AbstractVSSVertexPtr> > vector_;
 
   /**
    * Intermediate s-channel tensor
    */
   vector<pair<AbstractVVTVertexPtr, AbstractSSTVertexPtr> > tensor_;
   
   /**
    * The contact vertex 
    */
   vector<AbstractVVSSVertexPtr> contact_;
   //@}
   
   
 };
 
 }
 
 #endif /* HERWIG_MEvv2ss_H */

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