${\boldsymbol {\boldsymbol b}}$ ${\boldsymbol {\overline{\boldsymbol b}}}$ 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