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${\mathit m}_{{{\mathit \Upsilon}{(1S)}}}–{\mathit m}_{{{\mathit \eta}_{{b}}}}$

INSPIRE   PDGID:

M171M2

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 62.3 \pm3.2}$ OUR AVERAGE  Error includes scale factor of 1.8.  See the ideogram below. $57.9$ $\pm1.5$ $\pm1.8$ 34k 1 MIZUK 2012 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ + hadrons $68.5$ $\pm6.6$ $\pm2.0$ $2.3$ $\pm0.5$k 2 BONVICINI 2010 CLEO ${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ $66.1$ ${}^{+4.8}_{-4.9}$ $\pm2.0$ $13$ $\pm5$k 2 AUBERT 2009 AQ BABR ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ $71.4$ ${}^{+2.3}_{-3.1}$ $\pm2.7$ $19$ $\pm3$k 2 AUBERT 2008 V BABR ${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ • • We do not use the following data for averages, fits, limits, etc. • • $67.1$ $\pm3.4$ $\pm2.3$ $10$ ${}^{+5}_{-4}$ 2, 3 DOBBS 2012 ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ hadrons 1  With floating width. Not independent of the corresponding mass measurement. 2  Assuming ${\Gamma}_{{\mathit \eta}_{{b}}{(1S)}}$ = 10 MeV. Not independent of the corresponding ${{\mathit \gamma}}$ energy or mass measurements. 3  Obtained by analyzing CLEO III data but not authored by the CLEO Collaboration.

${\mathit m}_{{{\mathit \Upsilon}{(1S)}}}–{\mathit m}_{{{\mathit \eta}_{{b}}}}$ (MeV)

References:

DOBBS 2012 PRL 109 082001 Observation of the ${{\mathit \eta}_{{b}}{(2S)}}$ Meson in ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{b}}{(2S)}}$ , ${{\mathit \eta}_{{b}}{(2S)}}$ $\rightarrow$ Hadrons and Confirmation of the ${{\mathit \eta}_{{b}}{(1S)}}$ Meson MIZUK 2012 PRL 109 232002 Evidence for the ${{\mathit \eta}_{{b}}{(2S)}}$ and Observation of ${{\mathit h}_{{b}}{(1P)}}$ $\rightarrow$ ${{\mathit \eta}_{{b}}{(1S)}}{{\mathit \gamma}}$ and ${{\mathit h}_{{b}}{(2P)}}$ $\rightarrow$ ${{\mathit \eta}_{{b}}{(1S)}}{{\mathit \gamma}}$ BONVICINI 2010 PR D81 031104 Measurement of the ${{\mathit \eta}_{{b}}{(1S)}}$ Mass and the Branching Fraction for ${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{b}}{(1S)}}$ AUBERT 2009AQ PRL 103 161801 Evidence for the ${{\mathit \eta}_{{b}}{(1S)}}$ Meson in Radiative ${{\mathit \Upsilon}{(2S)}}$ Decay AUBERT 2008V PRL 101 071801 Observation of the Bottomonium Ground State in the Decay ${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{b}}}$