ParticleConstants.h

Go to the documentation of this file.

/*
  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