BBA05ELFormFactorsModel.h

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//____________________________________________________________________________
/*!
 
\class    genie::BBA05ELFormFactorsModel
 
\brief    Concrete implementation of the ELFormFactorsModelI interface.
          Computes elastic form factors using the BBA2005 parameterization.
 
\ref      R.Bradford, A.Bodek, H.Budd and J.Arrington, hep-ex/0602017
 
\author   Costas Andreopoulos <c.andreopoulos \at cern.ch>
          University of Liverpool
 
\created  Oct 19, 2005
 
\cpright  Copyright (c) 2003-2025, The GENIE Collaboration
          For the full text of the license visit http://copyright.genie-mc.org        
*/
//____________________________________________________________________________
 
#ifndef _BBA2005_EL_FORM_FACTORS_MODEL_H_
#define _BBA2005_EL_FORM_FACTORS_MODEL_H_
 
#include "Physics/QuasiElastic/XSection/ELFormFactorsModelI.h"
 
namespace genie {
 
typedef struct SBBA2005Fit
{
  double a0, a1, a2, b1, b2, b3, b4;
}
BBA2005Fit_t;
 
class BBA05ELFormFactorsModel : public ELFormFactorsModelI {
 
public:
  BBA05ELFormFactorsModel();
  BBA05ELFormFactorsModel(string config);
  virtual ~BBA05ELFormFactorsModel();
 
  // implement the ELFormFactorsModelI interface
  double Gep (const Interaction * interaction) const;
  double Gmp (const Interaction * interaction) const;
  double Gen (const Interaction * interaction) const;
  double Gmn (const Interaction * interaction) const;
 
  // overload Algorithm's Configure() to load the BBA2005Fit_t
  // structs from the configuration Registry
  void   Configure  (const Registry & config);
  void   Configure  (string param_set);
 
private:
 
  // fill data members from the configuration Registry
  void LoadConfig(void);
 
  // the actual BBA2005 fit function
  double BBA05Fit (double tau, const BBA2005Fit_t & fp) const;
  double tau      (const Interaction * interaction) const;
 
  // model parameters.
  BBA2005Fit_t fGep;   ///< BBA2005 fit coefficients for Gep
  BBA2005Fit_t fGen;   ///< BBA2005 fit coefficients for Gen
  BBA2005Fit_t fGmp;   ///< BBA2005 fit coefficients for Gmp
  BBA2005Fit_t fGmn;   ///< BBA2005 fit coefficients for Gmn
  double       fMuP;   ///< Anomalous proton magnetic moment
  double       fMuN;   ///< Anomalous neutron magnetic moment
};
 
}         // genie namespace
 
#endif    // _BBA2005_EL_FORM_FACTORS_MODEL_H_