constexpr double photonMassInMeV
various mass-less particles
constexpr double muonMassInMeV
the mass of the muon (in MeV)
constexpr double chargedKaonMassInMeV
the mass of the charged kaon (in MeV)
constexpr double piZeroMassInMeV
the mass of the pi zero (in MeV)
constexpr double chargedPionMassInMeV
the mass of the charged pion (in MeV)
constexpr double KZeroMassInMeV
the mass of the neutral kaon (K0) (in MeV)
constexpr double protonMassInMeV
the mass of the proton (in MeV)
constexpr double neutronMassInMeV
the mass of the neutron (in MeV)
constexpr double electronMassInMeV
the mass of the electron (in MeV)