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 // -*- C++ -*-
 #ifndef Herwig_TwoKaonCzyzCurrent_H
 #define Herwig_TwoKaonCzyzCurrent_H
 //
 // This is the declaration of the TwoKaonCzyzCurrent class.
 //
 
 #include "WeakCurrent.h"
 
 namespace Herwig {
 
 using namespace ThePEG;
 
 /**
  * The TwoKaonCzyzCurrent class implements the current of PRD 81 094014 for the
  * production of two kaons.
  *
  * @see \ref TwoKaonCzyzCurrentInterfaces "The interfaces"
  * defined for TwoKaonCzyzCurrent.
  */
 class TwoKaonCzyzCurrent: public WeakCurrent {
 
 public:
 
   /**
    * The default constructor.
    */
   TwoKaonCzyzCurrent();
 
 
   /** @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;
   
   /**
    *  Calculation of the kaon form factor
    */
   Complex Fkaon(Energy2 q2,const int imode, const int ichan,
         IsoSpin::IsoSpin Itotal,
         Strangeness::Strange strange,
         tcPDPtr resonance,
         Energy ma, Energy mb) const;
   
   /**
    *  Calculation of the kaon form factor, remainder I=1
    */
   Complex FkaonRemainderI1(Energy2 q2) const;
   
   /**
    *  Calculation of the kaon form factor, remainder I=0
    */
   Complex FkaonRemainderI0(Energy2 q2,Energy ma, Energy mb) 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();
   //@}
 
   /**
    *   Construct the interpolators
    */
   void constructInterpolators() const;
 
 private:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   TwoKaonCzyzCurrent & operator=(const TwoKaonCzyzCurrent &) = delete;
 
 private:
 
   /**
    * Weights for the different \f$\rho\f$ resonances in the current, \f$\alpha_k\f$.
    */
   //@{
   /**
    *  The Complex weight used in the calculation
    */
   vector<Complex> rhoWgt_;
 
   /**
    *  The magnitude for input
    */
   vector<double> rhoMag_;
 
   /**
    *  The phase for input
    */
   vector<double> rhoPhase_;
   //@}
 
   /**
    * Weights for the different \f$\omega\f$ resonances in the current, \f$\alpha_k\f$.
    */
   //@{
   /**
    *  The Complex weight used in the calculation
    */
   vector<Complex> omegaWgt_;
 
   /**
    *  The magnitude for input
    */
   vector<double> omegaMag_;
 
   /**
    *  The phase for input
    */
   vector<double> omegaPhase_;
   //@}
 
   /**
    * Weights for the different \f$\phi\f$ resonances in the current, \f$\alpha_k\f$.
    */
   //@{
   /**
    *  The Complex weight used in the calculation
    */
   vector<Complex> phiWgt_;
 
   /**
    *  The magnitude for input
    */
   vector<double> phiMag_;
 
   /**
    *  The phase for input
    */
   vector<double> phiPhase_;
   //@}
   
   /**
    * The masses of the \f$\rho\f$ resonances.
    */
   vector<Energy> rhoMasses_;
 
   /**
    * The widths of the \f$\rho\f$ resonances.
    */
   vector<Energy> rhoWidths_;
 
   /**
    * The masses of the \f$\omega\f$ resonances.
    */
   vector<Energy> omegaMasses_;
 
   /**
    * The widths of the \f$\omega\f$ resonances.
    */
   vector<Energy> omegaWidths_;
   
   /**
    * The masses of the \f$\phi\f$ resonances.
    */
   vector<Energy> phiMasses_;
 
   /**
    * The widths of the \f$\phi\f$ resonances.
    */
   vector<Energy> phiWidths_;
 
   /**
    *   Regge \f$\beta\f$ parameter for \f$\rho\f$ resonances
    */
   double betaRho_;
 
   /**
    *   Regge \f$\beta\f$ parameter for \f$\omega\f$ resonances
    */
   double betaOmega_;
 
   /**
    *   Regge \f$\beta\f$ parameter for \f$\phi\f$ resonances
    */
   double betaPhi_;
   
   /**
    *  Number of resonaces at which to trucated the series
    */
   unsigned int nMax_;
 
   /**
    *  The \f$\eta_\phi\f$ parameter
    */
   double etaPhi_;
 
   /**
    *  The \f$\gamma_\omega\f$ parameter
    */
   double gammaOmega_;
 
   /**
    *  The \f$\gamma_\phi\f$ parameter
    */
   double gammaPhi_;
   
   /**
    *   Masses of the resonances
    */
   vector<vector<Energy> > mass_;
 
   /**
    *   Widths of the resonances
    */
   vector<vector<Energy> > width_;
 
   /**
    *   Couplings of the resonaces
    */
   vector<vector<Complex> > coup_;
 
   /**
    * The function \f$\frac{\\hat{H}}{dq^2}\f$ at \f$q^2=m^2\f$ for the GS form of the
    *  Breit-Wigner
    */
   vector<double> dh_;
 
   /**
    * The function \f$\\hat{H}\f$ at \f$q^2=m^2\f$ for the GS form of the
    *  Breit-Wigner
    */
   vector<Energy2> hres_;
 
   /**
    * The \f$H(0)\f$ parameter  for the GS form of the
    *  Breit-Wigner
    */
   vector<Energy2> h0_;
 
   /**
    *  The charged pion mass
    */
   Energy mpi_;
 
   /**
    *  The maximum energy
    */
   Energy eMax_;
 
   /**
    *  Interpolators for the higher resonance components for speed
    */
   mutable Interpolator<double,Energy2>::Ptr fKI0Re_, fKI0Im_,fKI1Re_, fKI1Im_;
   
 };
 
 }
 
 #endif /* Herwig_TwoKaonCzyzCurrent_H */

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