plural of exotic meson

plural of upsilon meson

(archaic, formal) A pion, a type of meson

(physics) Either of two mesons made of a mixture of up, down and strange quarks and their antiquarks

(physics) A short-lived hadronic isospin triplet.

(dated) A muon (kind of subatomic particle).

The upsilon particle

(physics) A meson composed of quarks, antiquarks, and nonvirtual gluons (instead of the usual quark-antiquark pair bound by virtual gluons).

(physics) A meson existing outside of the quark model, such as a hybrid meson or a glueball.

plural of J/psi meson