upsilon meson


Also found in: Encyclopedia, Wikipedia.

upsilon meson

n.
An electrically neutral meson consisting of a bottom quark and a bottom antiquark and having a mass 18,513 times that of the electron and a mean lifetime of about 1.2 × 10-20 second.
Mentioned in ?
References in periodicals archive ?
Adrover et al., "Production of J/[PSI] and Upsilon mesons in pp collisions at [square root of (s)] = 8 TeV," Journal of High Energy Physics, vol.