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AbstractAbstract
[en] The BES has made a precision γ mass measurement by careful e+e- energy scan near γ pair production threshold. The mass value obtained from eμ, eπ and (μπ, μμ, ππ) topologies combined together is Mγ = 1776.9 ± 0.3 ± 0.2 MeV. About 9 x 106 J/ψ events and 3.5pb-1Ds data at √s = 4.03 Gev have been accumulated. The preliminary results are presented and the careful physics analysis is underway. (author)
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Kikutani, Eiji; Matsuda, Takeshi (eds.); National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan); 435 p; Jun 1993; p. 381-385; BFWS92: international workshop on B-factories (accelerators and experiments); Tsukuba, Ibaraki (Japan); 17-20 Nov 1992
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