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ISSN - 09205632, Nuclear Physics B - Proceedings Supplements, 1991, vol. 27, p. 89-93

Measurement of the leptonic width and the muon-pair branching ratio of the γ(1S) with the MD-1 detector

Baru S. E., Beilin M. V., Blinov A. E., Bondar A. E., Bukin A. D., Groshev V. R., Klimenko S. G., Kolachev G. M., Onuchin A. P., Panin V. S., Protopopov I. Ya, Shamov A. G., Sidorov V. A., Skovpen Yu I., Skrinsky A. N., Tayursky V. A., Telnov V. I., Tikhonov Yu A., Tumaikin G. M., Undrus A. E., Vorobiov A. I., Zhilich V. N.

In experiments with e+e- beams performed at the VEPP-4 storage ring with the MD-1 detector we have measured Γee, the leptonic width, and Bμμ, the muon-pair branching ration, for the decay of γ(1s). We obtain Γee = (1.266 ± 0.023 ± 0.038) keV, Bμμ = (2.12 ± 0.20 ± 0.10)% and Γtot = (59.7 ± 5.7 ± 3.7) keV. © 1992.