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${{\mathit \gamma}}$ ENERGY IN ${{\mathit \Upsilon}{(2S)}}$ DECAY

INSPIRE   PDGID:

M171U2S

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT $609.3$ ${}^{+4.6}_{-4.5}$ $\pm1.9$ $13$ $\pm5$k 1 AUBERT 2009 AQ BABR ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ 1  Assuming ${\Gamma}_{{\mathit \eta}_{{b}}{(1S)}}$ = 10 MeV. Not independent of the corresponding mass or mass difference measurements.

References:

AUBERT 2009AQ PRL 103 161801 Evidence for the ${{\mathit \eta}_{{b}}{(1S)}}$ Meson in Radiative ${{\mathit \Upsilon}{(2S)}}$ Decay