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 // -*- C++ -*-
 //
 // VSSDecayer.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_VSSDecayer_H
 #define HERWIG_VSSDecayer_H
 //
 // This is the declaration of the VSSDecayer class.
 //
 
 #include "GeneralTwoBodyDecayer.h"
 #include "ThePEG/Helicity/Vertex/Scalar/VSSVertex.h"
 #include "ThePEG/Helicity/Vertex/Vector/VVVVertex.h"
 #include "ThePEG/Repository/EventGenerator.h"
 
 namespace Herwig {
 using namespace ThePEG;
 using Helicity::VSSVertexPtr;
 
 /** \ingroup Decay
  * The VSSDecayer class implements the decay of a vector
  * to 2 scalars in a general model. It holds an VSSVertex pointer
  * that must be typecast from the VertexBase pointer held in 
  * GeneralTwoBodyDecayer. It implents the virtual functions me2() and
  * partialWidth(). 
  *
  * @see GeneralTwoBodyDecayer
  */
 
 class VSSDecayer: public GeneralTwoBodyDecayer {
 
 public:
 
   /**
    * The default constructor.
    */
   VSSDecayer() {}
 
   /** @name Virtual functions required by the Decayer class. */
   //@{
   /**
    * 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;
 
   /**
    * Function to return partial Width
    * @param inpart The decaying particle.
    * @param outa One of the decay products.
    * @param outb The other decay product.
    */
   virtual Energy partialWidth(PMPair inpart, PMPair outa, 
                   PMPair outb) const;
   /**
    *  Has a POWHEG style correction
    */
   virtual POWHEGType hasPOWHEGCorrection()  {
     POWHEGType output = FSR;
     for(auto vertex : vertex_) {
       if(vertex->orderInAllCouplings()!=1) {
     output = No;
     break;
       }
     }
     return output;
   }
 
   /**
    *  Three-body matrix element including additional QCD radiation
    */
   virtual double threeBodyME(const int , const Particle & inpart,
                  const ParticleVector & decay,
                  ShowerInteraction inter, MEOption meopt);
 
   /**
    * Indentify outgoing vertices for the scalar and antiscalar
    */
   void identifyVertices(const int iscal, const int ianti,
             const Particle & inpart, const ParticleVector & decay,
             AbstractVSSVertexPtr & abstractOutgoingVertexS, 
             AbstractVSSVertexPtr & abstractOutgoingVertexA,
             ShowerInteraction inter);
 
   /**
    *  Set the information on the decay
    */
   virtual void setDecayInfo(PDPtr incoming, PDPair outgoing,
                 vector<VertexBasePtr>,
                 map<ShowerInteraction,VertexBasePtr> &,
                 const vector<map<ShowerInteraction,VertexBasePtr> > &,
                 map<ShowerInteraction,VertexBasePtr>);
   //@}
 
 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;
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   VSSDecayer & operator=(const VSSDecayer &) = delete;
 
 private:
 
   /**
    *  Abstract pointer to AbstractVSSVertex
    */
   vector<AbstractVSSVertexPtr> vertex_;
 
   /**
    * Pointer to the perturbative vertex
    */
   vector<VSSVertexPtr> perturbativeVertex_;
 
   /**
    *  Abstract pointer to AbstractVVVVertex for QCD radiation from incoming vector
    */
   map<ShowerInteraction,AbstractVVVVertexPtr> incomingVertex_;
 
   /**
    *  Abstract pointer to AbstractFFVVertex for QCD radiation from outgoing scalar
    */
   map<ShowerInteraction,AbstractVSSVertexPtr> outgoingVertex1_;
 
   /**
    *  Abstract pointer to AbstractFFVVertex for QCD radiation from outgoing scalar
    */
   map<ShowerInteraction,AbstractVSSVertexPtr> outgoingVertex2_;
 
   /**
    *  Spin density matrix
    */
   mutable RhoDMatrix rho_;
 
   /**
    *  Polarization vectors for the decaying particle
    */
   mutable vector<Helicity::VectorWaveFunction> vectors_;
 
  /**
    *  Spin density matrix for 3 body decay
    */
   mutable RhoDMatrix rho3_;
 
   /**
    *  Vector wavefunction for 3 body decay
    */
   mutable vector<Helicity::VectorWaveFunction> vector3_;
 
     /**
    *  Vector wavefunction for 3 body decay
    */
   mutable vector<Helicity::VectorWaveFunction> gluon_;
 
 };
 
 }
 
 #endif /* HERWIG_VSSDecayer_H */

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