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

INSPIRE   PDGID:

M077DM

VALUE (MeV) DOCUMENT ID TECN  COMMENT $\bf{ 129.63 \pm0.33}$ OUR AVERAGE  Error includes scale factor of 1.3.  See the ideogram below. $129.58$ $\pm0.09$ $\pm0.29$ ARTUSO 2005 CLEO ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}}$ $128.8$ $\pm0.4$ $\pm0.6$ EDWARDS 1999 CLE2 ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}{(1P)}}$ $131.7$ $\pm0.9$ $\pm1.3$ WALK 1986 CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ $131.7$ $\pm0.3$ $\pm1.1$ ALBRECHT 1985 E ARG ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ conv. ${{\mathit \gamma}}$ X $130.6$ $\pm0.8$ $\pm2.4$ NERNST 1985 CBAL ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $129$ $\pm0.8$ $\pm1$ HAAS 1984 CLEO ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ conv. ${{\mathit \gamma}}$ X $128.1$ $\pm0.4$ $\pm3.0$ KLOPFENSTEIN 1983 CUSB ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}$ X $130.6$ $\pm3.0$ PAUSS 1983 CUSB ${{\mathit \Upsilon}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \gamma}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$

${{\mathit \chi}_{{{b1}}}{(1P)}}$ mass (MeV)

References