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

Decay Modes

3 ${{\mathit h}^{+}}$3 ${{\mathit h}^{-}}$

not seen

4672

$\Gamma_{3}$

2 ${{\mathit h}^{+}}$2 ${{\mathit h}^{-}}$

not seen

4689

$\Gamma_{4}$

4 ${{\mathit h}^{+}}$4 ${{\mathit h}^{-}}$

not seen

4648

$\Gamma_{5}$

${{\mathit \gamma}}{{\mathit \gamma}}$

not seen

4699

$\Gamma_{6}$

${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$

${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$

$<8\%$

CL=90%

4350