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MelikhovFormFactor.h
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// -*- C++ -*-
//
// MelikhovFormFactor.h is a part of Herwig - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2017 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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