Lepton Introduction
A lepton is a fermion with a spin ћ / 2 that does not participate in strong interactions. Lepton includes electrons, muons, τ particles and their corresponding neutrinos (νe, νμ, and ντ and their antiparticles). The e-, μ-, and τ-particles have masses of 0.51 mega-electron volts, 105.66 mega-electron volts, and 1,776.99 mega-electron volts, respectively, and they all carry a unit of negative charge. Their antiparticles e +, μ +, and τ + carry a unit of positive charge. Neutrinos and their antiparticles are not charged and are neutral particles. Experimental results in recent years have shown that neutrinos have a non-zero static mass.