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 // -*- C++ -*-
 #ifndef Herwig_OmegaPionSNDCurrent_H
 #define Herwig_OmegaPionSNDCurrent_H
 //
 // This is the declaration of the OmegaPionSNDCurrent class.
 //
 
 #include "WeakCurrent.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * The OmegaPionSNDCurrent class implements the decay current for \f$\pi^\pm\pi^0 \gamma\f$ via
  *  an intermediate \f$\omega\f$. It inherits from the <code>WeakCurrent</code>
  *  class and implements the hadronic current.
  *
  *  The model is based on the one from Phys.Rev. D88 (2013) no.5, 054013.
  *
  * @see \ref OmegaPionSNDCurrentInterfaces "The interfaces"
  * defined for OmegaPionSNDCurrent.
  */
 class OmegaPionSNDCurrent: public WeakCurrent {
 
 public:
 
   /**
    * The default constructor.
    */
   OmegaPionSNDCurrent();
 
 public:
 
   /** @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 pseudoscalar
    * meson.
    * @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;
 
   /**
    *   Construct the SpinInfo for the decay products
    */
   virtual void constructSpinInfo(ParticleVector decay) const;
 
   /**
    * Accept the decay. Checks the meson against the list
    * @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. 
    * Checks the meson against the list
    * @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:
 
   /**
    * 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();
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   OmegaPionSNDCurrent & operator=(const OmegaPionSNDCurrent &) = delete;
 
 private :
   
   /**
    * Masses of the \f$\rho\f$ resonances
    */
   vector<Energy> rhoMasses_; 
 
   /**
    * Widths of the \f$\rho\f$ resonances
    */
   vector<Energy> rhoWidths_;
 
   /**
    *   Ampltitudes for the different rhos in the current
    */
   vector<double> amp_;
 
   /**
    *   Phases for the different rhos in the current
    */
   vector<double> phase_;
   
   /**
    * Weights of the different rho resonances in the current
    */
   vector<Complex> wgts_;
   
   /**
    * Coupling of the rho to the photon, \f$f_\rho\f$.
    */
   double fRho_;
   
   /**
    * Coupling of the rho to the omega and a pion, \f$g_{\rho\omega\pi}\f$.
    */
   InvEnergy gRhoOmegaPi_;
 
   /**
    *  The pion mass
    */
   Energy mpi_;
 };
 
 }
 
 #endif /* Herwig_OmegaPionSNDCurrent_H */

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