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 // -*- C++ -*-
 //
 // MEff2ff.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_MEff2ff_H
 #define HERWIG_MEff2ff_H
 //
 // This is the declaration of the MEff2ff class.
 //
 
 #include "GeneralHardME.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
 #include "Herwig/MatrixElement/ProductionMatrixElement.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFSVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFVVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFTVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFFFVertex.h"
 
 namespace Herwig {
 using namespace ThePEG;
 using Helicity::SpinorWaveFunction;
 using Helicity::SpinorBarWaveFunction;
 
 /**
  * This is the implementation of the \f$ 2\to 2\f$ matrix element for
  * a \f$ \Psi \Psi \to \Psi \Psi\f$ process. It inherits from 
  * GeneralHardME and implements the appropriate virtual functions.
  *
  * @see GeneralHardME
  */
 class MEff2ff: public GeneralHardME {
 
 public:
   
   /** Vector of SpinorWaveFunctions. */
   typedef vector<SpinorWaveFunction> SpinorVector;
 
   /** Vector of SpinorBarWaveFunctions. */
   typedef vector<SpinorBarWaveFunction> SpinorBarVector;
 
 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;
   //@}
 
 private:
   
   /** @name Functions to compute the ProductionMatrixElement. */
   //@{
   /**
    * Compute the matrix element for \f$\Psi\bar{\Psi}\to\Psi\bar{\Psi}\f$
    * @param me2 colour averaged, spin summed ME
    * @param first Whether or not first call to decide if colour decomposition etc
    * should be calculated
    * @return ProductionMatrixElement containing results of 
    * helicity calculations
    */
   ProductionMatrixElement
   ffb2ffbHeME(double & me2, bool first) const;
 
   /**
    * Compute the matrix element for \f$\Psi\Psi\to\Psi\Psi\f$
    * @param first Whether or not first call to decide if colour decomposition etc
    * should be calculated
    * @return ProductionMatrixElement containing results of 
    * helicity calculations
    */
   ProductionMatrixElement ff2ffHeME(double & me2, bool first) const;
   
   /**
    * Compute the matrix element for 
    * \f$\bar{\Psi}\bar{\Psi}\to\bar{\Psi}\bar{\Psi}\f$
    * @param me2 colour averaged, spin summed ME
    * @param first Whether or not first call to decide if colour decomposition etc
    * should be calculated
    * @return ProductionMatrixElement containing results of 
    * helicity calculations
    */
   ProductionMatrixElement fbfb2fbfbHeME(double & me2, bool first) const;
 
   /**
    * Compute the matrix element for \f$\Psi\bar{\Psi}\to\lambda\lambda\f$
    * @param me2 colour averaged, spin summed ME
    * @param first Whether or not first call to decide if colour decomposition etc
    * should be calculated
    * @return ProductionMatrixElement containing results of 
    * helicity calculations
    */
   ProductionMatrixElement 
   ffb2mfmfHeME(double & me2, bool first) 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 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.
    */
   MEff2ff & operator=(const MEff2ff &) = delete;
 
 private:
   
   /**
    * Store the vector of FFSVertex pairs
    */
   vector<pair<AbstractFFSVertexPtr, AbstractFFSVertexPtr> > scalar_;
 
   /**
    * Store the vector of FFVVertex pairs
    */
   vector<pair<AbstractFFVVertexPtr, AbstractFFVVertexPtr> > vector_;
 
   /**
    * Store the vector of FFTVertex pairs
    */
   vector<pair<AbstractFFTVertexPtr, AbstractFFTVertexPtr> > tensor_;
 
   /**
    *  Store any 4-point vertices
    */
   vector<AbstractFFFFVertexPtr> four_;
 
   /**
    *  Spinors
    */
   mutable std::array<SpinorVector,4> spin_;
 
   /**
    *  Barred spinors
    */
   mutable std::array<SpinorBarVector,4> sbar_;
 };
 
 }
 
 #endif /* HERWIG_MEff2ff_H */

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