The production of new particles and muon-electron events in $\e^{+}\e^{-}$ annihilation at SPEAR

It is about 18 months since the discovery of the first psi particle at SPEAR (Augustin et al. 1974; Abrams et al. 1974) and at BNL (Aubert et al. 1974). During this time, the e/sup +/e/sup -/ colliding-beam experiments have found a huge amount of new information on this new layer of hadron structure: nine states with widths ranging from tens of kilovolts to many megavolts, the principal decay modes and quantum numbers of some of the states, limits on charmed-particle production, mu e events, etc. The author discusses the new states, the total hadron cross section, and the mu e events. The work considered has been done by the SLAC/LBL magnetic detector group at the SPEAR e/sup + /e/sup -/ storage ring of the Stanford Linear Accelerator Center. (17 refs).