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 // -*- C++ -*-
 #ifndef HERWIG_GeneralQQHiggs_H
 #define HERWIG_GeneralQQHiggs_H
 //
 // This is the declaration of the GeneralQQHiggs class.
 //
 
 #include "Herwig/MatrixElement/HwMEBase.h"
 #include "Herwig/MatrixElement/ProductionMatrixElement.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFVVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFSVertex.h"
 #include "ThePEG/Helicity/Vertex/AbstractVVVVertex.h"
 #include "ThePEG/Helicity/WaveFunction/ScalarWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
 #include "Herwig/PDT/GenericMassGenerator.h"
 #include "GeneralQQHiggs.fh"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * The GeneralQQHiggs class implements the matrix elements for
  * \f$gg\to Q \bar Q h^0\f$ and \f$q\bar q\to Q \bar Q h^0\f$.
  *
  * @see \ref GeneralQQHiggsInterfaces "The interfaces"
  * defined for GeneralQQHiggs.
  */
 class GeneralQQHiggs: public HwMEBase {
 
 public:
 
   /** @name Standard constructors and destructors. */
   //@{
   /**
    * The default constructor.
    */
   GeneralQQHiggs();
   //@}
 
   /**
    *  Initialisation if used in a general model
    */
 
   /**
    *  Set up the matrix element
    */
   void setProcessInfo(unsigned int quark, PDPtr higgs,
               AbstractFFSVertexPtr vertex,
               unsigned int shapeOpt,
               unsigned int proc);
 
 public:
 
   /** @name Virtual functions required by the HwMEBase 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;
 
   /**
    * Set the typed and momenta of the incoming and outgoing partons to
    * be used in subsequent calls to me() and colourGeometries()
    * according to the associated XComb object. If the function is
    * overridden in a sub class the new function must call the base
    * class one first.
    */
   virtual void setKinematics();
 
   /**
    * The number of internal degrees of freedom used in the matrix
    * element.
    */
   virtual int nDim() const;
 
   /**
    * Generate internal degrees of freedom given nDim() uniform
    * random numbers in the interval \f$ ]0,1[ \f$. To help the phase space
    * generator, the dSigHatDR should be a smooth function of these
    * numbers, although this is not strictly necessary.
    * @param r a pointer to the first of nDim() consecutive random numbers.
    * @return true if the generation succeeded, otherwise false.
    */
   virtual bool generateKinematics(const double * r);
 
   /**
    * Return the matrix element squared differential in the variables
    * given by the last call to generateKinematics().
    */
   virtual CrossSection dSigHatDR() 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;
 
   /**
    *  Construct the vertex of spin correlations.
    */
   virtual void constructVertex(tSubProPtr);
   //@}
 
 protected:
 
   /**
    *  Members to calculate the matrix elements
    */
   //@{
   /**
    * Matrix element for \f$gg\to Q\bar{Q}h^0\f$
    * @param g1   The wavefunctions for the first  incoming gluon
    * @param g2   The wavefunctions for the second incoming gluon
    * @param q    The wavefunction  for the outgoing quark
    * @param qbar The wavefunction  for the outgoing antiquark
    * @param h    The wavefunction for the outgoing Higgs boson
    * @param flow The colour flow
    */
   double ggME(vector<VectorWaveFunction> &g1,vector<VectorWaveFunction> &g2,
           vector<SpinorBarWaveFunction> & q,vector<SpinorWaveFunction> & qbar,
           ScalarWaveFunction & h,
           unsigned int flow) const;
 
   /**
    * Matrix element for \f$q\bar{q}\to Q\bar{Q}h^0\f$
    * @param q1 The wavefunction  for the incoming quark
    * @param q2 The wavefunction  for the incoming antiquark
    * @param q3 The wavefunction  for the outgoing quark
    * @param q4 The wavefunction  for the outgoing antiquark
    * @param h    The wavefunction for the outgoing Higgs boson
    * @param flow The colour flow
    */
   double qqME(vector<SpinorWaveFunction> & q1,
           vector<SpinorBarWaveFunction> & q2,
           vector<SpinorBarWaveFunction>    & q3,
           vector<SpinorWaveFunction>    & q4,
           ScalarWaveFunction & h,
           unsigned int flow) 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;
 
   /** 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.
    */
   GeneralQQHiggs & operator=(const GeneralQQHiggs &) = delete;
 
 private:
   
   /**
    *  Switches to control the subprocess
    */
   //@{
   /**
    *  Quark Flavour
    */
   unsigned int quarkFlavour_;
   
   /**
    *  Processes to include
    */
   unsigned int process_;
   //@}
 
   /**
    *  Switches etc for the Higgs mass generation
    */
   //@{
   /**
    * Defines the Higgs resonance shape
    */
   unsigned int shapeOpt_;
 
   /**
    *  On-shell mass for the higgs
    */
   Energy mh_;
 
   /**
    *  On-shell width for the higgs
    */
   Energy wh_;
 
   /**
    *  The mass generator for the Higgs
    */
   GenericMassGeneratorPtr hmass_;
   //@}
   
   /**
    *  Vertices needed to compute the diagrams
    */
   //@{
   /**
    *  \f$ggg\f$ vertex
    */
   AbstractVVVVertexPtr GGGVertex_;
   
   /**
    *  \f$q\bar{q}g\f$ vertex
    */
   AbstractFFVVertexPtr QQGVertex_;
 
   /**
    *  \f$q\bar q h^0\f$ vertex
    */
   AbstractFFSVertexPtr QQHVertex_;
   //@}
   
 
   /**
    *  ParticleData objects of the particles
    */  
   //@{
   /**
    *  The gluon
    */
   PDPtr gluon_;
 
   /**
    * The Higgs boson
    */
   PDPtr higgs_;
   
   /**
    *  the quarks
    */
   vector<PDPtr> quark_;
 
   /**
    *  the antiquarks
    */
   vector<PDPtr> antiquark_;
   //@}
 
   /**
    *  Parameters for the phase-space generation
    */
   //@{
   /**
    *  Power for the phase-space mapping
    */
   double alpha_;
   //@}
 
   /**
    *  Colour flow
    */
   mutable unsigned int flow_;
 
   /**
    *  Diagram
    */
   mutable unsigned int diagram_;
 
   /**
    *  Matrix element
    */
   mutable ProductionMatrixElement me_;
 };
 
 }
 
 #endif /* HERWIG_GeneralQQHiggs_H */

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