SigmaRatio.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2017-2024  Laurent Forthomme
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef CepGen_StructureFunctions_SigmaRatio_h
#define CepGen_StructureFunctions_SigmaRatio_h
 
#include "CepGen/Modules/NamedModule.h"
 
namespace cepgen {
  namespace sigrat {
    class Parameterisation : public NamedModule<Parameterisation> {
    public:
      explicit Parameterisation(const ParametersList& params = ParametersList());
      virtual double operator()(double xbj, double q2, double& err) const = 0;
 
      static ParametersDescription description();
 
    protected:
      static double theta(double xbj, double q2);
      const double mp_;   
      const double mp2_;  
    };
  }  // namespace sigrat
}  // namespace cepgen
 
#endif