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 // -*- C++ -*-
 //
 // MelikhovFormFactor.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_MelikhovFormFactor_H
 #define HERWIG_MelikhovFormFactor_H
 //
 // This is the declaration of the MelikhovFormFactor class.
 //
 
 #include "ScalarFormFactor.h"
 
 namespace Herwig {
 using namespace ThePEG;
 
 /** \ingroup Decay
  *
  * The MelikhovFormFactor class implements the model of  Phys. Lett. B 380 (1996) 363
  * for the form factors for \f$B\to\pi,\rho\f$. 
  *
  * @see ScalarFormFactor
  *
  */
 class MelikhovFormFactor: public ScalarFormFactor {
 
 public:
 
   /**
    * The default constructor.
    */
   MelikhovFormFactor();
 
   /** @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;
   //@}
 
   /**
    * 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 {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:
 
   /**
    * The assignment operator is private and must never be called.
    * In fact, it should not even be implemented.
    */
   MelikhovFormFactor & operator=(const MelikhovFormFactor &) = delete;
 
 private:
 
   /** @name Parameters for the form factors */
   //@{
   /**
    *  The set of fit parameters to use
    */
   unsigned int _ifit;
 
   /**
    *  The value of \f$R_+(0)\f$ for the \f$B\to\pi\f$ form factor.
    */
   double _Rplus0;
 
   /**
    *  The value of \f$M_+\f$ for the \f$B\to\pi\f$ form factor.
    */
   Energy _Mplus;
 
   /**
    *  The value of \f$n_+\f$ for the \f$B\to\pi\f$ form factor.
    */
   double _nplus;
 
   /**
    *  The value of \f$R_V(0)\f$ for the \f$B\to\rho\f$ form factor.
    */
   double _RV0;
 
   /**
    *  The value of \f$M_V\f$ for the \f$B\to\rho\f$ form factor.
    */
   Energy _MV;
 
   /**
    *  The value of \f$n_V\f$ for the \f$B\to\rho\f$ form factor.
    */
   double _nV;
 
   /**
    *  The value of \f$R_1(0)\f$ for the \f$B\to\rho\f$ form factor.
    */
   double _R10;
 
   /**
    *  The value of \f$M_1\f$ for the \f$B\to\rho\f$ form factor.
    */
   Energy _M1;
 
   /**
    *  The value of \f$n_1\f$ for the \f$B\to\rho\f$ form factor.
    */
   double _n1;
 
   /**
    *  The value of \f$R_2(0)\f$ for the \f$B\to\rho\f$ form factor.
    */
   double _R20;
 
   /**
    *  The value of \f$M_2\f$ for the \f$B\to\rho\f$ form factor.
    */
   Energy _M2;
 
   /**
    *  The value of \f$n_2\f$ for the \f$B\to\rho\f$ form factor.
    */
   double _n2;
   //@}
 };
 
 }
 
 #endif /* HERWIG_MelikhovFormFactor_H */

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