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 // -*- C++ -*-
 //
 // SMHiggsWWDecayer.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_SMHiggsWWDecayer_H
 #define HERWIG_SMHiggsWWDecayer_H
 //
 // This is the declaration of the SMHiggsWWDecayer class.
 //
 
 #include "Herwig/Decay/PerturbativeDecayer.h"
 #include "Herwig/Decay/PhaseSpaceMode.h"
 #include "ThePEG/Helicity/Vertex/AbstractFFVVertex.fh"
 #include "ThePEG/Helicity/Vertex/AbstractVVSVertex.fh"
 #include "ThePEG/Helicity/WaveFunction/ScalarWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 using namespace ThePEG::Helicity;
 
 /**
  * The SMHiggsWWDecayer class performs the decay of the Standard Model
  * Higgs boson to \f$W^+W^-\f$ and \f$Z^0Z^0\f$ including the decays
  * of the gauge bosons.
  *
  * @see \ref SMHiggsWWDecayerInterfaces "The interfaces"
  * defined for SMHiggsWWDecayer.
  */
 class SMHiggsWWDecayer: public PerturbativeDecayer {
 
 public:
 
   /**
    *  A typedef to select the  boson decay modes
    */
   typedef Selector<unsigned int> ModeSelector;
 
 public:
 
   /**
    * The default constructor.
    */
   SMHiggsWWDecayer();
 
   /**
    * Check if this decayer can perfom the decay for a particular mode.
    * Uses the modeNumber member but can be overridden
    * @param parent The decaying particle
    * @param children The decay products
    */
   virtual bool accept(tcPDPtr parent, const tPDVector & children) const;
 
   /**
    * For a given decay mode and a given particle instance, perform the
    * decay and return the decay products. As this is the base class this
    * is not implemented.
    * @return The vector of particles produced in the decay.
    */
   virtual ParticleVector decay(const Particle & parent,
                    const tPDVector & children) const;
 
   /**
    * Which of the possible decays is required
    */
   virtual int modeNumber(bool &, tcPDPtr, const tPDVector & ) const {return -1;}
   
   /**
    * Return the matrix element squared for a given mode and phase-space channel.
    * @param ichan The channel we are calculating the matrix element for. 
    * @param part The decaying Particle.
    * @param outgoing The particles produced in the decay
    * @param momenta  The momenta of the particles produced in the decay
    * @param meopt Option for the calculation of the matrix element
    * @return The matrix element squared for the phase-space configuration.
    */
   double me2(const int ichan,const Particle & part,
          const tPDVector & outgoing,
          const vector<Lorentz5Momentum> & momenta,
          MEOption meopt) const;
 
   /**
    *   Construct the SpinInfos for the particles produced in the decay
    */
   virtual void constructSpinInfo(const Particle & part,
                  ParticleVector outgoing) const;
 
   /**
    * Output the setup information for the particle database
    * @param os The stream to output the information to
    * @param header Whether or not to output the information for MySQL
    */
   virtual void dataBaseOutput(ofstream & os,bool header) 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();
 
   /**
    * Initialize this object. Called in the run phase just before
    * a run begins.
    */
   virtual void doinitrun();
   //@}
 
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   SMHiggsWWDecayer & operator=(const SMHiggsWWDecayer &) = delete;
 
 private:
 
   /**
    *  Pointers to the vertices for the helicity calculations
    */
   //@{
   /**
    *  Pointer to the fermion-femion-W vertex
    */
   AbstractFFVVertexPtr _theFFWVertex;
 
   /**
    *  Pointer to the fermion-femion-Z vertex
    */
   AbstractFFVVertexPtr _theFFZVertex;
 
   /**
    *  Pointer to the higgs-WW/ZZ vertex
    */
   AbstractVVSVertexPtr _theHVVVertex;
   //@}
 
   /**
    *  Selectors for the gauge boson decay modes
    */
   //@{
   /**
    *  Selector for the W decays
    */
   ModeSelector _wdecays;
 
   /**
    *  Selector for the Z decays
    */
   ModeSelector _zdecays;
   //@}
 
   /**
    *  Product of gauge boson branching ratios for normalisation
    */
   vector<double> _ratio;
 
   /**
    *  Maximum weights for the decays
    */
   //@{
   /**
    *  Maximum weight for \f$H\to W^+W^-\f$ decays
    */
   vector<double> _wmax;
 
   /**
    *  Maximum weight for \f$H\to Z^0Z^0\f$ decays
    */
   vector<double> _zmax;
   //@}
 
   /**
    *  Spin density matrix
    */
   mutable RhoDMatrix _rho;
 
   /**
    *  Scalar wavefunction
    */
   mutable ScalarWaveFunction _swave;
 
   /**
    *  1st spinor wavefunction
    */
   mutable vector<SpinorWaveFunction   > _awave1;
 
   /**
    *  2nd spinor wavefunction
    */
   mutable vector<SpinorWaveFunction   > _awave2;
 
   /**
    *  1st barred spinor wavefunction
    */
   mutable vector<SpinorBarWaveFunction> _fwave1;
 
   /**
    *  2nd barred spinor wavefunction
    */
   mutable vector<SpinorBarWaveFunction> _fwave2;
 };
 
 }
 
 #endif /* HERWIG_SMHiggsWWDecayer_H */

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