FortranFactorisedProcess.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2018-2025  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_Process_FortranFactorisedProcess_h
#define CepGen_Process_FortranFactorisedProcess_h
 
#include "CepGen/Process/FactorisedProcess.h"
 
namespace cepgen::proc {
  class FortranFactorisedProcess : public FactorisedProcess {
  public:
    explicit FortranFactorisedProcess(const ParametersList&, const std::function<double()>& func);
    ProcessPtr clone() const override { return std::make_unique<FortranFactorisedProcess>(*this); }
 
    static ParametersList kProcParameters;
 
  private:
    void prepareFactorisedPhaseSpace() final;
    double computeFactorisedMatrixElement() final;
 
    const std::function<double()> func_;  
 
    // mapped variables
    double m_y1_{0.};           
    double m_y2_{0.};           
    double m_pt_diff_{0.};      
    double m_phi_pt_diff_{0.};  
  };
  class FortranFactorisedProcess : public FactorisedProcess {…};
}  // namespace cepgen::proc
 
#endif