Process.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2020-2025  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 CepGenMadGraph_Process_h
#define CepGenMadGraph_Process_h
 
#include "CepGen/Modules/NamedModule.h"
 
namespace cepgen {
  class Momentum;
}  // namespace cepgen
 
namespace cepgen::mg5amc {
  class Process : public NamedModule<Process> {
  public:
    explicit Process(const ParametersList&);
    virtual ~Process() = default;
 
    static ParametersDescription description();
 
    inline const std::vector<int>& intermediatePartons() const { return incoming_pdgids_; }
    inline const std::vector<int>& centralSystem() const { return central_pdgids_; }
 
    virtual void initialise(const std::string&) = 0;
    virtual double eval() = 0;
    virtual const std::vector<Momentum>& momenta() = 0;
 
    Process& setMomentum(size_t i, const Momentum& mom);
 
  protected:
    const std::vector<int> incoming_pdgids_, central_pdgids_;
    std::vector<double*> mom_;
  };
  class Process : public NamedModule<Process> {…};
}  // namespace cepgen::mg5amc
 
#endif