Composition bb Symbol ϒ Discovered E288 experiment | Statistics Bosonic Antiparticle Self | |
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Mass 7000946030000000000♠9.46030(26) GeV/c |
The Upsilon meson (
ϒ
) is a quarkonium state (i.e. flavourless meson) formed from a bottom quark and its antiparticle. It was discovered by the E288 experiment team, headed by Leon Lederman, at Fermilab in 1977, and was the first particle containing a bottom quark to be discovered because it is the lightest that can be produced without additional massive particles. It has a lifetime of 1.21×10−20 s and a mass about 9.46 GeV/c2 in the ground state.
References
Upsilon meson Wikipedia(Text) CC BY-SA