${\boldsymbol {\boldsymbol b}}$ ${\boldsymbol {\overline{\boldsymbol b}}}$ MESONS(including possibly non- ${\boldsymbol {\boldsymbol q}}$ ${\boldsymbol {\overline{\boldsymbol q}}}$ states) INSPIRE search

# ${{\boldsymbol \eta}_{{b}}{(1S)}}$ $I^G(J^{PC})$ = $0^+(0^{- +})$

Quantum numbers shown are quark-model predictions. Observed in radiative decay of the ${{\mathit \Upsilon}{(3S)}}$, therefore ${}^{C} = +$.
 ${{\mathit \eta}_{{b}}{(1S)}}$ MASS $9398.7 \pm2.0$ MeV (S = 1.5)
 ${\mathit m}_{{{\mathit \Upsilon}{(1S)}}}–{\mathit m}_{{{\mathit \eta}_{{b}}}}$ $62.3 \pm3.2$ MeV (S = 1.8)
 ${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(3S)}}$ DECAY $920.6 {}^{+2.8}_{-3.2}$ MeV
 ${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(2S)}}$ DECAY $609 \pm5$ MeV
 ${{\mathit \eta}_{{b}}{(1S)}}$ WIDTH $10 {}^{+5}_{-4}$ MeV