Lifetimes and branching ratios for heavy-lepton cascades

Abstract

We have advocated a heavy-lepton model in which the muonic sector $M^{-}$, $M^0$ explains neutrino-produced trimuons via cascade decay, and the electronic sector $E^{-}$, $E^0$ accounts for $e^{+}{e}^{-}\to \mu e+\left(\mathrm{missing}\mathrm{energy}\right)$ events. For these heavy leptons we estimate lifetimes, expected track lengths in bubble-chamber and emulsion experiments, and branching ratios for all decay stages.