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 // -*- C++ -*-
 //
 // SemiLeptonicScalarDecayer.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_SemiLeptonicScalarDecayer_H
 #define HERWIG_SemiLeptonicScalarDecayer_H
 //
 // This is the declaration of the SemiLeptonicScalarDecayer class.
 //
 #include "Herwig/Decay/DecayIntegrator.h"
 #include "Herwig/Decay/FormFactors/ScalarFormFactor.h"
 #include "Herwig/Decay/WeakCurrents/LeptonNeutrinoCurrent.h"
 #include "ThePEG/Helicity/LorentzTensor.h"
 
 namespace Herwig {
 using namespace ThePEG;
 
 /** \ingroup Decay
  *
  *  The <code>SemiLeptonicScalarDecayer</code> class is designed for the
  *  semileptonic decay of a (pesudo)scalar meson to another meson and a
  *  lepton/neutino pair.
  *
  *  This class implements the matrix element in a general form with form-factors
  *  for the hadronic current. These form-factor are specified using a ScalarFormFactor
  *  class and the leptonic part of the decay uses the LeptonNeutrinoCurrent.
  * 
  * @see DecayIntegrator
  * @see ScalarFormFactor
  * @see LeptonNeutrinoCurrent 
  *
  */
 class SemiLeptonicScalarDecayer: public DecayIntegrator {
 
 public:
 
   /**
    * Default constructor.
    */
   SemiLeptonicScalarDecayer();
   
   /**
    * 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;
   
   /**
    * Which of the possible decays is required
    * @param cc Is this mode the charge conjugate
    * @param parent The decaying particle
    * @param children The decay products
    */
   virtual int modeNumber(bool & cc, tcPDPtr parent, 
              const tPDVector & children) const ;
 
   /**
    * 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);
   //@}
 
   /**
    * Standard Init function used to initialize the interfaces.
    */
   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 and
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
 
   /**
    * Initialize this object to the begining of the run phase.
    */
   virtual void doinitrun();
   //@}
 
 private:
 
   /**
    * Private and non-existent assignment operator.
    */
   SemiLeptonicScalarDecayer & operator=(const SemiLeptonicScalarDecayer &) = delete;
 
 private:
 
   /**
    * The leptonic current
    */
   LeptonNeutrinoCurrentPtr _current;
 
   /**
    * The form factor
    */
   ScalarFormFactorPtr _form;
 
   /**
    * the maximum weight for the integration of a given decay
    */
   vector<double> _maxwgt;
 
   /**
    * mapping of the mode to the form factor
    */
   vector<int> _modemap;
 
   /**
    *  Spin density matrix
    */
   mutable RhoDMatrix _rho;
 
   /**
    *  Polarization vectors for the decay products
    */
   mutable vector<Helicity::LorentzPolarizationVector> _vectors;
 
   /**
    *  Polarization vectors for the decay products
    */
   mutable vector<Helicity::LorentzTensor<double> > _tensors;
 
   /**
    *  Constants for the mapping of the leptonic current
    */
   mutable vector<unsigned int> _constants;
 
   /**
    *  Spins of the particles
    */
   mutable vector<PDT::Spin> _ispin;
 
   /**
    *  Location of the outgoing meson
    */
   mutable unsigned int _imes;
 };
 
 }
 
 
 #endif /* HERWIG_SemiLeptonicScalarDecayer_H */

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