# ${{\boldsymbol \gamma}}$ ENERGY IN ${{\boldsymbol \Upsilon}{(2S)}}$ DECAY INSPIRE search

VALUE (MeV) DOCUMENT ID TECN  COMMENT
$\bf{ 110.44 \pm0.29}$ OUR AVERAGE  Error includes scale factor of 1.1.
$110.58$ $\pm0.08$ $\pm0.30$
 2005
CLEO ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$
$110.8$ $\pm0.3$ $\pm0.6$
 1999
CLE2 ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}{(1P)}}$
$107.0$ $\pm1.1$ $\pm1.3$
 1986
CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$
$110.6$ $\pm0.3$ $\pm0.9$
 1985 E
ARG ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ conv. ${{\mathit \gamma}}$ X
$110.4$ $\pm0.8$ $\pm2.2$
 1985
CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X
$109.5$ $\pm0.7$ $\pm1.0$
 1984
CLEO ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ conv. ${{\mathit \gamma}}$ X
$108.2$ $\pm0.3$ $\pm2.0$
 1983
CUSB ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X
$108.8$ $\pm4.0$
 1983
CUSB ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$
References:
 ARTUSO 2005
PRL 94 032001 Photon Transitions in ${{\mathit \Upsilon}{(2S)}}$ and ${{\mathit \Upsilon}{(3S)}}$ Decays
 EDWARDS 1999
PR D59 032003 Measurement of the Mass Splittings between the ${\mathit {\mathit b}}{\mathit {\overline{\mathit b}}}{{\mathit \chi}_{{b,J}}{(1P)}}$ States
 WALK 1986
PR D34 2611 The ${{\mathit \chi}_{{b}}}$ States in Exclusive Radiative Decay of the ${{\mathit \Upsilon}{(2S)}}$
 ALBRECHT 1985E
PL 160B 331 Radiative Decays of the ${{\mathit \Upsilon}{(2S)}}$ into the Three ${{\mathit \chi}_{{b}}}$ States
 NERNST 1985
PRL 54 2195 Observation of Three ${{\mathit p}}$ States in the Radiative Decay of ${{\mathit \Upsilon}{(2S)}}$
 HAAS 1984
PRL 52 799 Observation of Radiative Decays of the ${{\mathit \Upsilon}{(2S)}}$
 KLOPFENSTEIN 1983
PRL 51 160 Observation of the Lowest ${\mathit P}{\mathrm -wave}$ ${{\mathit b}}{{\overline{\mathit b}}}$ Bound States
 PAUSS 1983
PL 130B 439 Observation of ${{\mathit \chi}_{{b}}}$ Production in the Exclusive Reaction ${{\mathit \Upsilon}^{\,'}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \chi}_{{b}}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \Upsilon}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}$ (${{\mathit e}^{+}}{{\mathit e}^{-}}$ or ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ )