Beam.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2013-2024  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_Physics_Beam_h
#define CepGen_Physics_Beam_h
 
#include <memory>
 
#include "CepGen/FormFactors/FormFactors.h"
#include "CepGen/Physics/Momentum.h"
#include "CepGen/Physics/PartonFlux.h"
 
namespace cepgen {
  class Beam : public SteeredObject<Beam> {
  public:
    explicit Beam(const ParametersList&);  
 
    static ParametersDescription description();
 
    friend std::ostream& operator<<(std::ostream&, const Beam&);  
 
    void initialise();  
 
    inline bool elastic() const { return elastic_; }  
    inline Beam& setElastic(bool el) {
      elastic_ = el;
      return *this;
    }
 
    inline spdgid_t integerPdgId() const { return pdg_id_; }  
    inline Beam& setIntegerPdgId(spdgid_t pdg) {
      pdg_id_ = pdg;
      return *this;
    }
 
    inline const Momentum& momentum() const { return momentum_; }  
    inline Beam& setMomentum(const Momentum& mom) {
      momentum_ = mom;
      return *this;
    }
 
    inline const ParametersList& formFactors() const { return formfac_; }             
    inline const ParametersList& partonFluxParameters() const { return flux_info_; }  
 
  private:
    spdgid_t pdg_id_{0};        
    Momentum momentum_;         
    ParametersList formfac_;    
    ParametersList flux_info_;  
    bool elastic_{true};        
  };
}  // namespace cepgen
 
#endif