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 // -*- C++ -*-
 #ifndef HERWIG_MEPP2HiggsVBFPowheg_H
 #define HERWIG_MEPP2HiggsVBFPowheg_H
 //
 // This is the declaration of the MEPP2HiggsVBFPowheg class.
 //
 
 #include "Herwig/MatrixElement/Hadron/MEPP2HiggsVBF.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * Here is the documentation of the MEPP2HiggsVBFPowheg class.
  *
  * @see \ref MEPP2HiggsVBFPowhegInterfaces "The interfaces"
  * defined for MEPP2HiggsVBFPowheg.
  */
 class MEPP2HiggsVBFPowheg: public Herwig::MEPP2HiggsVBF {
 
 public:
 
   /**
    * The default constructor.
    */
   MEPP2HiggsVBFPowheg();
 
   /** @name Virtual functions required by the MEBase class. */
   //@{
 
   /**
    * Return the scale associated with the last set phase space point.
    */
   virtual Energy2 scale() const;
 
   /**
    * 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;
   //@}
 
 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:
 
   /**
    *  The NLO weight
    */
   double NLOWeight() const;
 
   /**
    *  Leading order matrix element
    */
   Energy4 loMatrixElement(const Lorentz5Momentum &p1,
               const Lorentz5Momentum &p2,
               const Lorentz5Momentum &q1,
               const Lorentz5Momentum &q2,
               double G1, double G2) 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();
   //@}
 
 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;
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   MEPP2HiggsVBFPowheg & operator=(const MEPP2HiggsVBFPowheg &) = delete;
 
 private:
 
   /**
    *  The Born variables
    */
   //@{
   /**
    *  \f$x_B\f$
    */
   double _xB;
 
   /**
    *  Partons
    */
   tcPDPtr _partons[5];
 
   mutable Energy2 _q2;
   //@}
 
   /**
    *  The radiative variables
    */
   //@{
   /**
    *  The \f$x_p\f$ or \f$z\f$ real integration variable
    */
   double  _xp;
 
   /**
    *  The \f$z_p\f$ real integration variable 
    */
   double _zp;
 
   /**
    *  The \f$fi\f$ real integration variable 
    */
   double _phi;
   //@}
 
   /**
    *  The variables to get the right boost
    */
   //@{
   /**
    *  LO momenta 
    */
   Lorentz5Momentum _loMomenta[4];
   /**
    *  The transfered (virtual boson) momentum 
    */
   mutable Lorentz5Momentum _pa;
 
   /**
    *  The incoming quark momentum 
    */
   mutable Lorentz5Momentum _pb;
 
   /**
    *  The outgoing quark momentum
    */
   Lorentz5Momentum _pc;
 
   /**
    *  The incoming quark momentum 
    */
   Lorentz5Momentum _pbother;
 
   /**
    *  The outgoing quark momentum
    */
   Lorentz5Momentum _pcother;
   //@}
 
   /**
    *  Electroweak parameters
    */
   //@{
   /**
    *  The square of the Z mass
    */
   Energy2 _mz2;
 
   /**
    *  The square of the W mass
    */
   Energy2 _mw2;
   //@}
 
   /**
    *  The first hadron
    */
   tcBeamPtr _hadron;
 
   /**
    * Selects a dynamic or fixed factorization scale
    */
   unsigned int scaleOpt_;
 
   /**
    * The factorization scale 
    */
   Energy muF_;
 
   /**
    *  Prefactor if variable scale used
    */
   double scaleFact_;
 
   /**
    *  Whether to generate the positive, negative or leading order contribution
    */
   unsigned int contrib_;
 
   /**
    *  Power for sampling \f$x_p\f$
    */
   double power_;
 
   /**
    *  Jacobian for \f$x_p\f$ integral
    */
   double jac_;
 
 
 };
 
 }
 
 #endif /* HERWIG_MEPP2HiggsVBFPowheg_H */

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