e/Bottom eta meson

Information
has gloss	eng: The bottom eta meson or eta-b meson is a flavorless meson formed from a bottom quark and its antiparticle. It was first observed by the BaBar experiment at SLAC in 2008, and is the lightest particle containing a bottom and anti-bottom quark.
lexicalization	eng: Bottom eta meson
instance of	(noun) (nontechnical usage) a tiny piece of anything molecule, speck, particle, corpuscle, mote, atom