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

INSPIRE   PDGID:

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 ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$

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 ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ )