[医] μ介子

[ noun ]
an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino
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mu-meson \mu-meson\, mu meson \mu meson\n. (Physics)
an elementary particle with a negative charge and a half-life
of 2 microseconds; the muon. It is a lepton, not a true
meson, and decays to an electron and neutrino and
antineutrino.

Syn: muon, negative muon.
[WordNet 1.5]