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 // -*- C++ -*-
 //
 // MEPP2HiggsJet.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_MEPP2HiggsJet_H
 #define HERWIG_MEPP2HiggsJet_H
 //
 // This is the declaration of the MEPP2HiggsJet class.
 //
 
 #include "ThePEG/MatrixElement/ME2to2Base.h"
 #include "Herwig/Utilities/Maths.h"
 #include "Herwig/MatrixElement/ProductionMatrixElement.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 "Herwig/MatrixElement/ProductionMatrixElement.h"
 
 namespace Herwig {
 using namespace ThePEG;
 using namespace ThePEG::Helicity;
 
 /**
  * The MEPP2HiggsJet class implements the matrix element for Higgs+jet production.
  *
  * @see \ref MEPP2HiggsJetInterfaces "The interfaces"
  * defined for MEPP2HiggsJet.
  */
 class MEPP2HiggsJet: public ME2to2Base {
 
 public:
 
   /**
    * The default constructor.
    */
   MEPP2HiggsJet() :  
     _shapeopt(2),_maxflavour(5), _process(0),
     _minloop(6),_maxloop(6),_massopt(0) , _mh(ZERO),_wh(ZERO)
   {}
 
   /** @name Virtual functions required by the MEBase class. */
   //@{
   /**
    * Return the matrix element for the kinematical configuation
    * previously provided by the last call to setKinematics(). Uses
    * me().
    */
   virtual CrossSection dSigHatDR() const;
 
   /**
    * The number of internal degreed of freedom used in the matrix
    * element.
    */
   virtual int nDim() const;
 
   /**
    * 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;
 
   /**
    * 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);
 
   /**
    *  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:
 
   /** @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:
 
   /**
    *  Members to return the matrix elements for the different subprocesses
    */
   //@{
   /**
    * Matrix element for \f$q\bar{q}\to Hg\f$.
    * @param fin   Spinors for incoming quark
    * @param ain   Spinors for incoming antiquark
    * @param hout  Wavefunction for the outgoing higgs
    * @param gout  Polarization vectors for the outgoing gluon
    * @param me    Whether or not to calculate the matrix element for spin correlations
    **/
   double qqbarME(vector<SpinorWaveFunction> & fin, vector<SpinorBarWaveFunction> & ain,
          ScalarWaveFunction & hout, vector<VectorWaveFunction> & gout,
          bool me) const;
 
   /**
    * Matrix element for \f$qg\to Hq\f$.
    * @param fin  Spinors for incoming quark
    * @param gin  Polarization vectors for the incoming gluon
    * @param hout Wavefunction for the outgoing higgs
    * @param fout Spinors for outgoing quark
    * @param me   Whether or not to calculate the matrix element for spin correlations
    **/
   double qgME(vector<SpinorWaveFunction> & fin,vector<VectorWaveFunction> & gin,
           ScalarWaveFunction & hout, vector<SpinorBarWaveFunction> & fout,
           bool me) const;
 
   /**
    * Matrix element for \f$\bar{q}g\to H\bar{q}\f$.
    * @param fin  Spinors for incoming antiquark
    * @param gin  Polarization vectors for the incoming gluon
    * @param hout Wavefunction for the outgoing higgs
    * @param fout Spinors for outgoing antiquark
    * @param me   Whether or not to calculate the matrix element for spin correlations
    **/
   double qbargME(vector<SpinorBarWaveFunction> & fin,vector<VectorWaveFunction> & gin,
          ScalarWaveFunction & hout, vector<SpinorWaveFunction> & fout,
          bool me) const;
 
   /**
    * Matrix element for \f$gg\to Hg\f$.
    * @param g1   Polarization vectors for the first  incoming gluon
    * @param g2   Polarization vectors for the second incoming gluon
    * @param hout Wavefunction for the outgoing higgs
    * @param g4   Polarization vectors for the outgoing gluon
    * @param me   Whether or not to calculate the matrix element for spin correlations
    **/
   double ggME(vector<VectorWaveFunction> g1, vector<VectorWaveFunction> g2,
           ScalarWaveFunction & hout,     vector<VectorWaveFunction> g4,
           bool me) const;
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   MEPP2HiggsJet & operator=(const MEPP2HiggsJet &) = delete;
 
 private:
 
   /**
    * Defines the Higgs resonance shape
    */
   unsigned int _shapeopt;
 
   /**
    *  Maximum PDG code of the quarks allowed
    */
   unsigned int _maxflavour;
 
   /**
    *  Option for which processes to include
    */
   unsigned int _process;
   
   /**
    * Matrix element for spin correlations
    */
   ProductionMatrixElement _me;
 
   /**
    *  Minimum flavour of quarks to include in the loops
    */
   int _minloop;
 
   /**
    *  Maximum flavour of quarks to include in the loops
    */
   int _maxloop;
 
   /**
    *  Option for treatment of the fermion loops
    */
   unsigned int _massopt;
 
   /**
    *  On-shell mass for the higgs
    */
   Energy _mh;
 
   /**
    *  On-shell width for the higgs
    */
   Energy _wh;
 
   /**
    *  The mass generator for the Higgs
    */
   GenericMassGeneratorPtr _hmass;
 
   /**
    *  Storage of the loop functions
    */
   //@{
   /**
    *  B functions
    */
   mutable Complex _bi[5];
 
   /**
    *  C functions
    */
   mutable Complex _ci[8];
 
   /**
    *  D functions
    */
   mutable Complex _di[4];
   //@}
 
   /**
    *  Storage of the diagram weights for the \f$gg\to Hg\f$ subprocess
    */
   mutable double _diagwgt[3];
 };
 
 }
 
 #endif /* HERWIG_MEPP2HiggsJet_H */

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