ParticleConstants.h

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef TRUTHUTILS_PARTICLECONSTANTS_H
#define TRUTHUTILS_PARTICLECONSTANTS_H
 
 
namespace ParticleConstants
{
  namespace PDG2011
  {
    constexpr double electronMassInMeV = 0.510998910;
 
    constexpr double muonMassInMeV = 105.658367;
 
    constexpr double tauMassInMeV = 1776.82;
 
    constexpr double ZMassInMeV = 91187.6;
 
    constexpr double piZeroMassInMeV = 134.9766;
 
    constexpr double chargedPionMassInMeV = 139.57018;
 
    constexpr double etaMassInMeV = 547.853;
 
    constexpr double KZeroMassInMeV = 497.614;
 
    constexpr double chargedKaonMassInMeV = 493.677;
 
    constexpr double DZeroMassInMeV = 1864.8;
 
    // the mass of the J/psi meson (in MeV)
    constexpr double JpsiMassInMeV = 3096.916;
 
    constexpr double BZeroMassInMeV = 5279.5;
 
    constexpr double BPlusMassInMeV = 5279.17;
 
    constexpr double BsMassInMeV = 5366.3;
 
    constexpr double neutronMassInMeV = 939.565346;
 
    constexpr double protonMassInMeV = 938.272013;
 
    constexpr double lambdaMassInMeV = 1115.683;
  }
 
  namespace PDG2024
  {
    constexpr double electronMassInMeV = 0.51099895000;
 
    constexpr double muonMassInMeV = 105.6583755;
 
    constexpr double tauMassInMeV = 1776.93;
 
    constexpr double ZZeroMassInMeV = 91188.0;
 
    constexpr double piZeroMassInMeV = 134.9768;
 
    constexpr double chargedPionMassInMeV = 139.57039;
 
    constexpr double etaMassInMeV = 547.862;
 
    constexpr double KZeroMassInMeV = 497.611;
 
    constexpr double chargedKaonMassInMeV = 493.677;
 
    constexpr double DZeroMassInMeV = 1864.84;
 
    // the mass of the J/psi meson (in MeV)
    constexpr double JpsiMassInMeV = 3096.900;
 
    constexpr double BZeroMassInMeV = 5279.72;
 
    constexpr double BPlusMassInMeV = 5279.41;
 
    constexpr double neutronMassInMeV = 939.5654205;
 
    constexpr double protonMassInMeV = 938.27208816;
 
    constexpr double lambdaMassInMeV = 1115.683;
  }
 
  // Use the PDG2011 values for consistency with Gaudi
  using namespace PDG2011;
 
 
  constexpr double photonMassInMeV = 0.0;
  constexpr double electronNeutrinoMassInMeV = 0.0;
  constexpr double muonNeutrinoMassInMeV = 0.0;
  constexpr double tauNeutrinoMassInMeV = 0.0;
}
 
#endif