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

${{\boldsymbol \eta}_{{b}}{(2S)}}$ $I^G(J^{PC})$ = $0^+(0^{- +})$ 

Quantum numbers shown are quark-model predictions.
${{\mathit \eta}_{{b}}{(2S)}}$ MASS   $9999 \pm4$ MeV 
${\mathit m}_{{{\mathit \Upsilon}{(2S)}}}–{\mathit m}_{{{\mathit \eta}_{{b}}{(2S)}}}$   $24 \pm4$ MeV 
${{\mathit \eta}_{{b}}{(2S)}}$ WIDTH   $<24$ MeV  CL=90.0%
$\Gamma_{1}$ hadrons seen