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 // -*- C++ -*-
 //
 // ISGWFormFactor.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_ISGWFormFactor_H
 #define HERWIG_ISGWFormFactor_H
 //
 // This is the declaration of the <ISGWFormFactor class.
 //
 #include "ScalarFormFactor.h"
 #include "ThePEG/StandardModel/StandardModelBase.h"
 #include "ThePEG/PDT/ParticleData.h"
 #include "ThePEG/PDT/EnumParticles.h"
 #include "ThePEG/PDT/EnumParticles.h"
 #include "ThePEG/Repository/EventGenerator.h"
 
 namespace Herwig {
 using namespace ThePEG;
 
   /** \ingroup Decay
    *
    *  The ISGWFormFactor class is the implementation of the ISGW model of 
    *  Phys. Rev. D39, 799 (1989) for the form-factors. It inherits from the 
    *  ScalarFormFactor class and members
    *  for the calculation of the relevant form factors.
    * 
    * @see ScalarFormFactor
    * @see ISGW2FormFactor
    */
 
 class ISGWFormFactor: public ScalarFormFactor {
 
 public:
 
   /**
    * Default constructor
    */
   ISGWFormFactor();
 
   /** @name Form-Factors */
   //@{
   /**
    * The form factor for the weak decay of a scalar to a scalar. 
    * @param q2 The scale \f$q^2\f$.
    * @param iloc The location in the form-factor list.
    * @param id0 The PDG code of the incoming meson.
    * @param id1 The PDG code of the outgoing meson.
    * @param m0 The mass of the incoming meson.
    * @param m1 The mass of the outgoing meson.
    * @param f0 The form-factor \f$f_0\f$. 
    * @param fp The form-factor \f$f_+\f$.
    */
   virtual void ScalarScalarFormFactor(Energy2 q2,unsigned int iloc,int id0,int id1,Energy m0,
                       Energy m1,Complex & f0,Complex & fp) const;
 
   /**
    * The form factor for the weak decay of a scalar to a vector.
    * @param q2 The scale \f$q^2\f$.
    * @param iloc The location in the form-factor list.
    * @param id0 The PDG code of the incoming meson.
    * @param id1 The PDG code of the outgoing meson.
    * @param m0 The mass of the incoming meson.
    * @param m1 The mass of the outgoing meson.
    * @param V  The form-factor \f$V\f$
    * @param A0 The form-factor \f$A_0\f$
    * @param A1 The form-factor \f$A_1\f$
    * @param A2 The form-factor \f$A_2\f$
    */
   virtual void ScalarVectorFormFactor(Energy2 q2, unsigned int iloc, int id0, int id1,
                       Energy m0, Energy m1, Complex & V,
                       Complex & A0,Complex & A1,Complex & A2) const;
 
   /**
    * The form factor for the weak decay of a scalar to a tensor.
    * @param q2 The scale \f$q^2\f$.
    * @param iloc The location in the form-factor list.
    * @param id0 The PDG code of the incoming meson.
    * @param id1 The PDG code of the outgoing meson.
    * @param m0 The mass of the incoming meson.
    * @param m1 The mass of the outgoing meson.
    * @param h  The form-factor \f$h\f$.
    * @param k  The form-factor \f$k\f$. 
    * @param bp The form-factor \f$b_+\f$.
    * @param bm The form-factor \f$b_-\f$.
    */
   virtual void ScalarTensorFormFactor(Energy2 q2,unsigned int iloc,int id0,int id1,
                       Energy m0,
                       Energy m1, complex<InvEnergy2> & h,
                       Complex & k, complex<InvEnergy2> & bp,
                       complex<InvEnergy2> & bm) 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
    * @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);
   //@}
 
   /**
    * Standard Init function used to initialize the interfaces.
    */
   static void Init();
 
 protected:
 
   /** The member which implements all the different form-factors
    * @param q2 The scale \f$q^2\f$.
    * @param iloc The location in the form-factor list.
    * @param id0 The PDG code of the incoming meson.
    * @param id1 The PDG code of the outgoing meson.
    * @param m0 The mass of the incoming meson.
    * @param m1 The mass of the outgoing meson.
    * @param f1 The first  form-factor.
    * @param f2 The second form-factor. 
    * @param f3 The third  form-factor.
    * @param f4 The fourth form-factor.
    */
   void formFactor(Energy2 q2,unsigned int iloc,int id0,int id1,Energy m0,
           Energy m1,Complex & f1,Complex & f2,
           Complex & f3,Complex & f4) const;
   // general member to calculate all the form-factors
 
 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();
   //@}
 
 private:
 
   /**
    * Private and non-existent assignment operator.
    */
   ISGWFormFactor & operator=(const ISGWFormFactor &) = delete;
 
 private:
 
   /**
    * The relativistic compensation factor
    */
   double _kappa;
 
   /** @name Quark masses */
   //@{
   /**
    * The down quark mass
    */
   Energy _mdown;
 
   /**
    * The up quark mass
    */
   Energy _mup;
 
   /**
    * The strange quark mass
    */
   Energy _mstrange;
 
   /**
    * The charm quark mass
    */
   Energy _mcharm;
 
   /**
    * The bottom quark mass
    */
   Energy _mbottom;
 
   /**
    * The masses of the quarks as a vector
    */
   vector<Energy> _mquark;
   //@}
 
 
   /** @name Wave function parameters */
   //@{
   /**
    * The wavefunction s-wave \f$\beta\f$ variational parameters for  \f$u\bar{d}\f$ 
    */
   Energy _betaSud;
 
   /**
    * The wavefunction s-wave \f$\beta\f$ variational parameters for  \f$u\bar{s}\f$ 
    */
   Energy _betaSus;
 
   /**
    * The wavefunction s-wave \f$\beta\f$ variational parameters for  \f$u\bar{c}\f$ 
    */
   Energy _betaSuc;
 
   /**
    * The wavefunction s-wave \f$\beta\f$ variational parameters for  \f$u\bar{b}\f$ 
    */
   Energy _betaSub;
 
   /**
    * The s-wave variational parameters as a vector.
    */
   vector<vector<Energy> > _betaS;
 
   /**
    * The wavefunction p-wave \f$\beta\f$ variational parameters for  \f$u\bar{d}\f$ 
    */
   Energy _betaPud;
 
   /**
    * The wavefunction s-wave \f$\beta\f$ variational parameters for  \f$u\bar{s}\f$ 
    */
   Energy _betaPus;
 
   /**
    * The wavefunction s-wave \f$\beta\f$ variational parameters for  \f$u\bar{c}\f$ 
    */
   Energy _betaPuc;
 
   /**
    * The p-wave variational parameters as a vector
    */
   vector<vector<Energy> > _betaP;
   //@}
 
   /**
    * The \f$\eta-\eta'\f$ mixing angle 
    */
   double _thetaeta;
 };
 
 }
 
 #endif /* HERWIG_ISGWFormFactor_H */

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