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

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M078DM

VALUE (MeV) DOCUMENT ID TECN  COMMENT $\bf{ 110.44 \pm0.29}$ OUR AVERAGE  Error includes scale factor of 1.1. $110.58$ $\pm0.08$ $\pm0.30$ ARTUSO 2005 CLEO ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ $110.8$ $\pm0.3$ $\pm0.6$ EDWARDS 1999 CLE2 ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}{(1P)}}$ $107.0$ $\pm1.1$ $\pm1.3$ WALK 1986 CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ $110.6$ $\pm0.3$ $\pm0.9$ ALBRECHT 1985 E ARG ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ conv. ${{\mathit \gamma}}$ X $110.4$ $\pm0.8$ $\pm2.2$ NERNST 1985 CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $109.5$ $\pm0.7$ $\pm1.0$ HAAS 1984 CLEO ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ conv. ${{\mathit \gamma}}$ X $108.2$ $\pm0.3$ $\pm2.0$ KLOPFENSTEIN 1983 CUSB ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $108.8$ $\pm4.0$ PAUSS 1983 CUSB ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$

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