${\boldsymbol {\boldsymbol b}}$ ${\boldsymbol {\overline{\boldsymbol b}}}$ 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 
$\Gamma_{1}$ hadrons seen
$\Gamma_{2}$ 3 ${{\mathit h}^{+}}$3 ${{\mathit h}^{-}}$ not seen4672
$\Gamma_{3}$ 2 ${{\mathit h}^{+}}$2 ${{\mathit h}^{-}}$ not seen4689
$\Gamma_{4}$ 4 ${{\mathit h}^{+}}$4 ${{\mathit h}^{-}}$ not seen4648
$\Gamma_{5}$ ${{\mathit \gamma}}{{\mathit \gamma}}$ not seen4699
$\Gamma_{6}$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ $<9\times 10^{-3}$CL=90%4698
$\Gamma_{7}$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ $<8\%$CL=90%4350