PDG.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_PDG_h
#define CepGen_Physics_PDG_h
 
#include <cstddef>  // size_t
 
#include "CepGen/Physics/ParticleProperties.h"
 
namespace cepgen {
  class PDG {
  public:
    enum PdgIdEnum : pdgid_t {
      invalid = 0,
      down = 1,
      up = 2,
      electron = 11,
      muon = 13,
      tau = 15,
      gluon = 21,
      photon = 22,
      W = 24,
      pomeron = 990,
      reggeon = 110,
      piZero = 111,
      piPlus = 211,
      eta = 221,
      phi1680 = 100333,
      neutron = 2112,
      proton = 2212,
      diffractiveProton = 9902210
    };
 
    class Id {
    public:
      inline Id(pdgid_t pdgid) : pdgid_(pdgid) {}                 
      inline operator pdgid_t() const { return pdgid_; }          
      friend std::ostream& operator<<(std::ostream&, const Id&);  
 
    private:
      pdgid_t pdgid_;
    };
 
    static PDG& get();  
    PDG(const PDG&) = delete;
    void operator=(const PDG&) = delete;
    ~PDG() = default;  
 
    void define(const ParticleProperties&);    
    pdgids_t particles() const;                
    void dump(std::ostream* = nullptr) const;  
    size_t size() const;                       
 
    //--- per-particles information
 
    bool has(spdgid_t) const;                              
    const ParticleProperties& operator()(spdgid_t) const;  
    ParticleProperties& operator[](spdgid_t id);           
    const std::string& name(spdgid_t) const;               
    double colours(spdgid_t) const;                        
    double mass(spdgid_t) const;                           
    double width(spdgid_t) const;                          
    double charge(spdgid_t) const;                         
    std::vector<double> charges(spdgid_t) const;  
 
  private:
    explicit PDG();
    std::unordered_map<pdgid_t, ParticleProperties> particles_;  
  };
}  // namespace cepgen
 
#endif