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 // -*- C++ -*-//
 // ThreePionCzyzCurrent.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_ThreePionCzyzCurrent_H
 #define Herwig_ThreePionCzyzCurrent_H
 //
 // This is the declaration of the ThreePionCzyzCurrent class.
 //
 
 #include "WeakCurrent.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 
 /** \ingroup Decay
  *
  * The ThreeMesonCzyzCurrent class implements the currents from Eur.Phys.J. C47 (2006) 617-624 for 
  * \f$\pi^+\pi^-\pi^0\f$
  * @see WeakCurrent.
  * @see \ref ThreePionCzyzCurrentInterfaces "The interfaces"
  * defined for ThreePionCzyzCurrent.
  * 
  */
 class ThreePionCzyzCurrent: public WeakCurrent {
 
 public:
 
   /**
    * The default constructor.
    */
   ThreePionCzyzCurrent();
 
   /** @name Methods for the construction of the phase space integrator. */
   //@{
   /**
    * Complete the construction of the decay mode for integration.classes inheriting
    * from this one.
    * This method is purely virtual and must be implemented in the classes inheriting
    * from WeakCurrent.
    * @param icharge   The total charge of the outgoing particles in the current.
    * @param resonance If specified only include terms with this particle
    * @param flavour Information on the required flavours of the quarks
    * @param imode     The mode in the current being asked for.
    * @param mode      The phase space mode for the integration
    * @param iloc      The location of the of the first particle from the current in
    *                  the list of outgoing particles.
    * @param ires      The location of the first intermediate for the current.
    * @param phase     The prototype phase space channel for the integration.
    * @param upp       The maximum possible mass the particles in the current are
    *                  allowed to have.
    * @return Whether the current was sucessfully constructed.
    */
   virtual bool createMode(int icharge, tcPDPtr resonance, FlavourInfo flavour,
               unsigned int imode,PhaseSpaceModePtr mode,
               unsigned int iloc,int ires,
               PhaseSpaceChannel phase, Energy upp );
 
   /**
    * The particles produced by the current. This just returns the two pseudoscalar
    * mesons and the photon.
    * @param icharge The total charge of the particles in the current.
    * @param imode The mode for which the particles are being requested
    * @param iq The PDG code for the quark
    * @param ia The PDG code for the antiquark
    * @return The external particles for the current.
    */
   virtual tPDVector particles(int icharge, unsigned int imode, int iq, int ia);
   //@}
 
   /**
    * Hadronic current. This method is purely virtual and must be implemented in
    * all classes inheriting from this one.
    * @param resonance If specified only include terms with this particle
    * @param flavour Information on the required flavours of the quarks
    * @param imode The mode
    * @param ichan The phase-space channel the current is needed for.
    * @param scale The invariant mass of the particles in the current.
    * @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 current. 
    */
   virtual vector<LorentzPolarizationVectorE> 
   current(tcPDPtr resonance, FlavourInfo flavour,
       const int imode, const int ichan,Energy & scale,
       const tPDVector & outgoing,
       const vector<Lorentz5Momentum> & momenta,
       DecayIntegrator::MEOption meopt) const;
 
   /**
    * Accept the decay. Checks the particles are the allowed mode.
    * @param id The id's of the particles in the current.
    * @return Can this current have the external particles specified.
    */
   virtual bool accept(vector<int> id);
 
   /**
    * Return the decay mode number for a given set of particles in the current. 
    * @param id The id's of the particles in the current.
    * @return The number of the mode
    */
   virtual unsigned int decayMode(vector<int> id);
 
   /**
    * 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
    * @param create Whether or not to add a statement creating the object
    */
   virtual void dataBaseOutput(ofstream & os,bool header,bool create) 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;
 
   /** 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 and
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
   //@}
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   ThreePionCzyzCurrent & operator=(const ThreePionCzyzCurrent &) = delete;
 
 private:
  
   /**
    *  Masses and widths of the particles, used in the \f$I=0\f$ piece
    */
   //@{
   /**
    *  Rho masses
    */
   vector<Energy> rhoMasses_;
   /**
    *  Rho widths
    */
   vector<Energy> rhoWidths_;
   
   /**
    *  Omega masses
    */
   vector<Energy> omegaMasses_;
   /**
    *  Omega widths
    */
   vector<Energy> omegaWidths_;
   
   /**
    *  Phi mass
    */
   Energy phiMass_;
   /**
    *  Phi width
    */
   Energy phiWidth_;
   //@}
 
   /**
    *  Couplings in the model \f$I=0\f$, labelled A..F in paper
    */
   vector<InvEnergy3> coup_I0_;
 
   /**
    *  Masses and widths for the \f$I=1\f$ component
    */
   //@{
   /**
    *  Rho masses
    */
   vector<Energy> rhoMasses_I1_;
   /**
    *  Rho widths
    */
   vector<Energy> rhoWidths_I1_;
   
   /**
    *  Omega masses
    */
   Energy omegaMass_I1_;
   /**
    *  Omega widths
    */
   Energy omegaWidth_I1_;
   //@}
   
   /**
    *  Couplings for the the \f$I=1\f$ component
    */
   //@{
   /**
    *   The sigma parameter
    */
   double sigma_;
 
   /**
    *  The numerical part of \f$G_\omega\f$
    */
   InvEnergy GW_pre_;
   
   /**
    *  The full \f$G_\omega\f$
    */
   Energy GW_;
 
   /**
    * \f$g_{\omega\pi\pi}\f$
    */
   double g_omega_pi_pi_;
   //@}
 
   /**
    *  Pion mass
    */
   Energy mpip_, mpi0_;
 
 };
 
 }
 
 #endif /* Herwig_ThreePionCzyzCurrent_H */

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