1978 – Discovery of the tau lepton at Stanford Linear Accelerator Center, existence of tau neutrino theorized
With the electron and the muon neutrinos having been discovered, it seemed that the entirety of the neutrino could be grouped neatly into one or the other: The fundamental constituents of matter could logically be grouped into families each containing two quarks and two leptons (u, d, e, nu_e, and c, s, mu, nu_mu). Ordinary […]