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${{\mathit \eta}_{{b}}{(1S)}}$ MASS

INSPIRE   PDGID:

M171M

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 9398.7 \pm2.0}$ OUR AVERAGE  Error includes scale factor of 1.5.  See the ideogram below. $9394.8$ ${}^{+2.7}_{-3.1}$ ${}^{+4.5}_{-2.7}$ 29k FULSOM 2018 BELL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ $9400.7$ $\pm1.7$ $\pm1.6$ 33.1k TAMPONI 2015 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}}$ + hadrons $9402.4$ $\pm1.5$ $\pm1.8$ 34k 1 MIZUK 2012 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ + hadrons $9391.8$ $\pm6.6$ $\pm2.0$ 2.3k 2 BONVICINI 2010 CLEO ${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ $9394.2$ ${}^{+4.8}_{-4.9}$ $\pm2.0$ 13k 2 AUBERT 2009 AQ BABR ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ $9388.9$ ${}^{+3.1}_{-2.3}$ $\pm2.7$ 19k 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. • • $9393.2$ $\pm3.4$ $\pm2.3$ 10 2, 3 DOBBS 2012 ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ hadrons $9300$ $\pm20$ $\pm20$ HEISTER 2002 D ALEP $181 - 209$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ 1  With floating width. Not independent of the corresponding mass difference measurement. 2  Assuming ${\Gamma}_{{\mathit \eta}_{{b}}{(1S)}}$ = 10 MeV. Not independent of the corresponding ${{\mathit \gamma}}$ energy or mass difference measurements. 3  Obtained by analyzing CLEO III data but not authored by the CLEO Collaboration.

${{\mathit \eta}_{{b}}{(1S)}}$ MASS (MeV)

References:

FULSOM 2018 PRL 121 232001 Observation of $\Upsilon(2S)\to\gamma \eta_{b}(1S)$ decay TAMPONI 2015 PRL 115 142001 First Observation of the Hadronic Transition ${{\mathit \Upsilon}{(4S)}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit h}_{{b}}{(1P)}}$ and New Measurement of the ${{\mathit h}_{{b}}{(1P)}}$ and ${{\mathit \eta}_{{b}}{(1S)}}$ PParameters 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 ${{\mathit \Upsilon}{(3S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}_{{b}}}$ HEISTER 2002D PL B530 56 Search for ${{\mathit \gamma}}$ ${{\mathit \gamma}}$ $\rightarrow$ ${{\mathit \eta}_{{b}}}$ in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at LEP-2