Upsilon meson 1
noundomain: natural obj.
EnWordnet [ver.5.0]
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EnglishDefinition
a quarkonium state (i.e. flavourless meson) formed from a bottom quark and its antiparticle.
Hypernym
meson 1
noun
an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0
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