bottomoniumn.
/ˌbɒtəˈməʊnɪəm/, U.S. /ˌbɑdəˈmoʊniəm/ Particle Physics.
A particle consisting of a bottom quark bound to a bottom antiquark. Cf. quarkonium n.
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tau1949
photomeson1950
theta1954
eta1961
omega meson1961
rho1961
phi meson1962
bottomonium1976
quarkonium1977
upsilon1977
1976 H. Hayashi et al. in Ann. Physics 101 397 We shall comment in this paper on charmonium equivalent ‘bottomonium’ and ‘toponium’ decays.
1992 J. F. Donoghue et al. Dynamics Standard Model xiii. 350 Quarkonium is the bound state of a heavy quark Q with its antiparticle. Two such systems, charmonium..and bottomonium..have been the subject of much experimental and theoretical study.
2002 F. Close et al. Particle Odyssey ix. 164 As in the case of charm, where there exist charmed particles as well as charmonium, so there exist bottom particles as well as bottomonium.
This is a new entry (OED Third Edition, September 2016; most recently modified version published online December 2021).
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n.1976