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 // -*- C++ -*-
 //
 // MEff2vv.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_MEff2vv_H
 #define HERWIG_MEff2vv_H
 //
 // This is the declaration of the MEff2vv class.
 //
 
 #include "GeneralHardME.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFVVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFTVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFSVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractVVSVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractVVTVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractVVVVertex.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
 #include "Herwig/MatrixElement/ProductionMatrixElement.h"
 
 namespace Herwig {
 using namespace ThePEG;
 using ThePEG::Helicity::SpinorWaveFunction;
 using ThePEG::Helicity::SpinorBarWaveFunction;
 using ThePEG::Helicity::VectorWaveFunction;
 
 /**
  * This class implements the matrix element calculation for a generic
  * \f$\Psi \Psi \rightarrow V^{\mu} V^{\nu}\f$ process. 
  *
  * @see \ref MEff2vvInterfaces "The interfaces"
  * defined for MEff2vv.
  */
 class MEff2vv: public GeneralHardME {
 public:
   
   /** Vector of SpinorWaveFunctions objects */
   typedef vector<SpinorWaveFunction> SpinorVector;
 
   /** Vector of SpinorBarWaveFunction objects. */
   typedef vector<SpinorBarWaveFunction> SpinorBarVector;
 
   /** Vector of VectorWaveFunction objects. */
   typedef vector<VectorWaveFunction> VBVector;
 
 public:
 
   /**
    * The default constructor.
    */
   MEff2vv() : vector_(0), tensor_(0), scalar_(0) {}
 
   /** @name Virtual functions required by the GeneralHardME 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;
   //@}
 
   /**
    * Construct the vertex information for the spin correlations
    * @param sub Pointer to the relevent SubProcess
    */
   virtual void constructVertex(tSubProPtr sub);
 
 
 protected:
   
   /**
    * A debugging function to test the value of me2 against an
    * analytic function.
    * @param me2 \f$ |\bar{\mathcal{M}}|^2 \f$
    */
   virtual void debug(double me2) const;
 
 private: 
   
   /**
    * Compute the production matrix element.
    * @param sp Spinors for first incoming fermion
    * @param sbar SpinorBar Wavefunctions for incoming anti-fermion
    * @param v1 A vector of VectorWaveFunction objects for the first vector
    * @param m1 Whether v1 is massless or not
    * @param v2 A vector of VectorWaveFunction objects for the second vector
    * @param m2 Whether v2 is massless or not
    * @param first Whether or not first call to decide if colour decomposition etc
    * should be calculated
    * @param me2 The value of the \f$ |\bar{\mathcal{M}}|^2 \f$
    */
   ProductionMatrixElement 
   ff2vvME(const SpinorVector & sp, const SpinorBarVector sbar, 
       const VBVector & v1, bool m1, const VBVector & v2, bool m2,
       double & me2, bool first) 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 {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);}
   //@}
 
 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.
    */
   MEff2vv & operator=(const MEff2vv &) = delete;
 
 private:
 
   /**
    * Storage for a dynamically cast vertices for a tchannel vector
    * intermediate
    */
   vector<pair<AbstractFFVVertexPtr, AbstractFFVVertexPtr> > fermion_;
 
   /**
    * Storage for a dynamically cast vertices for a schannel vector
    * intermediate
    */
   vector<pair<AbstractFFVVertexPtr, AbstractVVVVertexPtr> > vector_;
 
   /**
    * Storage for a dynamically cast vertices for a schannel scalar
    * intermediate
    */
   vector<pair<AbstractFFTVertexPtr, AbstractVVTVertexPtr> > tensor_;
 
   /**
    * Storage for a dynamically cast vertices for a schannel scalar
    * intermediate for massless external vector bosons
    */
   vector<pair<AbstractFFSVertexPtr, AbstractVVSVertexPtr> > scalar_;
 };
 
 }
 
 #endif /* HERWIG_MEff2vv_H */

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