Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The
upsilon particle
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