oxford views updated May 18 2018
muon (symbol μ−)
Negatively charged elementary particle
, originally thought to be a meson
but now classified as a lepton
. It has spin 1
, a mass c.
207 times that of the electron
, and decays weakly into an electron, a neutrino
, and an antineutrino. See also antimatter
oxford views updated Jun 11 2018
mu·on / ˈmyoōˌän/ •
n. Physics an unstable subatomic particle of the same class as an electron (a lepton), but with a mass around 200 times greater. Muons make up much of the cosmic radiation reaching the earth's surface.DERIVATIVES: mu·on·ic / myoōˈänik/ adj.