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 // -*- C++ -*-
 //
 // ISGW2FormFactor.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_ISGW2FormFactor_H
 #define HERWIG_ISGW2FormFactor_H
 //
 // This is the declaration of the ISGW2FormFactor class.
 //
 #include "ScalarFormFactor.h"
 #include "ThePEG/StandardModel/StandardModelBase.h"
 #include "ThePEG/PDT/EnumParticles.h"
 #include "ThePEG/PDT/ParticleData.h"
 #include "ThePEG/Repository/EventGenerator.h"
 
 namespace Herwig {
 using namespace ThePEG;
 
   /** \ingroup Decay
    *
    *  The ISGW2FormFactor class is the implementation of 
    *  the ISGW2 model of Phys. Rev. D52, 2783 (1995) for the scalar meson form
    *  factors.
    *
    *  It inherits from the ScalarFormFactor class and implements
    *  the calculation of the relevant form factors.
    *
    * @see ScalarFormFactor
    * @see ISGWFormFactor
    */
 
 class ISGW2FormFactor: public ScalarFormFactor {
 
 public:
 
   /**
    * Default constructor
    */
   ISGW2FormFactor();
 
   /** @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.
    */
   ISGW2FormFactor & operator=(const ISGW2FormFactor &) = delete;
 
 protected:
 
   /**
    * The saturated \f$\alpha_S\f$ used to calculate the form-factors.
    * @param mass Mass scale to work out the number of flavours.
    * @param q2 \f$q^2\f$ the scale.
    * @return the value of \f$\alpha_S\f$.
    */
   double alphaS(Energy mass, Energy2 q2) const {
     Energy2 lqcd2(0.04*GeV2);
     double nflav(4.);
     double output(_alphamuQM);
     if (q2>0.36*GeV2) {
       if(mass<_mcharm+0.03*GeV) nflav=3.0;
       output = 12.*Constants::pi/(33.-2.*nflav)/log(q2/lqcd2);
     }
     return output;
   }
 
 private:
 
   /** @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 for the \f$1^1S_0\f$ level.*/
   //@{
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$u\bar{d}\f$ 
    */
   Energy _beta1S0ud;
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$u\bar{s}\f$ 
    */
   Energy _beta1S0us;
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$s\bar{s}\f$ 
    */
   Energy _beta1S0ss;
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$c\bar{u}\f$ 
    */
   Energy _beta1S0cu;
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$c\bar{s}\f$ 
    */
   Energy _beta1S0cs;
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$u\bar{b}\f$ 
    */
   Energy _beta1S0ub;
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$s\bar{b}\f$ 
    */
   Energy _beta1S0sb;
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$c\bar{c}\f$ 
    */
   Energy _beta1S0cc;
 
   /**
    * The wavefunction \f$1^1S_0\f$ \f$\beta\f$ variational parameter for \f$b\bar{c}\f$ 
    */
   Energy _beta1S0bc;
 
   /**
    *  The wavefunction parameters as an array
    */
   vector<vector<Energy> > _beta1S0;
 
   /**
    *  The masses as a array
    */
   vector<vector<Energy> > _mass1S0;
   //@}
 
   /** @name Wave function parameters for the \f$1^3S_1\f$ level.*/
   //@{
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$u\bar{d}\f$ 
    */
   Energy _beta3S1ud;
 
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$u\bar{s}\f$ 
    */
   Energy _beta3S1us;
 
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$s\bar{s}\f$ 
    */
   Energy _beta3S1ss;
 
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$c\bar{u}\f$ 
    */
   Energy _beta3S1cu;
 
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$c\bar{s}\f$ 
    */
   Energy _beta3S1cs;
 
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$u\bar{b}\f$ 
    */
   Energy _beta3S1ub;
 
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$s\bar{b}\f$ 
    */
   Energy _beta3S1sb;
 
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$c\bar{c}\f$ 
    */
   Energy _beta3S1cc;
 
   /**
    * The wavefunction \f$1^3S_1\f$ \f$\beta\f$ variational parameter for \f$b\bar{c}\f$ 
    */
   Energy _beta3S1bc;
 
   /**
    * The wavefunction paramaeters as an array.
    */
   vector<vector<Energy> > _beta3S1;
   //@}
 
 
   /** @name Wave function parameters for the \f$1P\f$ levels.*/
   //@{
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$u\bar{d}\f$ 
    */
   Energy _beta1Pud;
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$u\bar{s}\f$ 
    */
   Energy _beta1Pus;
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$s\bar{s}\f$ 
    */
   Energy _beta1Pss;
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$c\bar{u}\f$ 
    */
   Energy _beta1Pcu;
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$c\bar{s}\f$ 
    */
   Energy _beta1Pcs;
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$u\bar{b}\f$ 
    */
   Energy _beta1Pub;
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$s\bar{b}\f$ 
    */
   Energy _beta1Psb;
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$c\bar{c}\f$ 
    */
   Energy _beta1Pcc;
 
   /**
    * The wavefunction \f$1P\f$ \f$\beta\f$ variational parameter for \f$b\bar{c}\f$ 
    */
   Energy _beta1Pbc;
 
   /**
    * The wavefunction paramaeters as an array.
    */
   vector<vector<Energy> > _beta1P;
 
   /**
    * The spin-1/2 masses
    */
   // the 1/2 spin masses
   vector<vector<Energy> > _massPoh;
 
   /**
    * The spin-3/2 masses
    */
   vector<vector<Energy> > _massPth;
   //@}
 
   /**@name Parameters for the strong coupling*/
   //@{
   /**
    *  The cut-off value of \f$\alpha_S\f$.
    */
   double _alphamuQM;
   /**
    * The values of \f$\alpha_S\f$ at the quark masses.
    */
   vector<double> _alphaQ;
   //@}
 
   /**@name Relativistic correction factors */
   //@{
   /**
    * The correction factor for \f$D\to\rho\f$.
    */
   double _CfDrho;
 
   /**
    * The correction factor for \f$D\to K^*\f$.
    */
   double _CfDKstar;
 
   /**
    * The correction factor for \f$D_s\to K^*\f$.
    */
   double _CfDsKstar;
 
   /**
    * The correction factor for \f$D_s\to\phi\f$.
    */
   double _CfDsphi;
 
   /**
    * The correction factor for \f$B\to\rho\f$.
    */
   double _CfBrho;
 
   /**
    * The correction factor for \f$B\to D^*\f$.
    */
   double _CfBDstar;
 
   /**
    * The correction factor for \f$B_s\to K^*\f$.
    */
   double  _CfBsKstar;
 
   /**
    * The correction factor for \f$B_s\to D^*\f$.
    */
   double _CfBsDstar;
 
   /**
    * The correction factor for \f$B_c\to D^*\f$.
    */
   double _CfBcDstar;
 
   /**
    * The correction factor for \f$B_c\to\psi\f$.
    */
   double _CfBcpsi;
 
   /**
    * The correction factor for \f$B_c\to B_s^*\f$.
    */
   double _CfBcBsstar;
 
   /**
    * The correction factor for \f$B_c\to B^*\f$.
    */
   double _CfBcBstar;
   //@}
 
   /**
    * The \f$\eta-\eta'\f$ mixing angle 
    */
   double _thetaeta;
 
   /**
    * Include the \f$a_L(\omega)\f$ piece of the \f$C_{ji}\f$ factor
    */
   bool _includeaW;
 };
 
 }
 
 #endif /* HERWIG_ISGW2FormFactor_H */

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