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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2014, vol. 731, p. 227-231

Measurement of the ratio of the lepton widths Γe e/Γμμ for the J/ψ meson

Aulchenko V. M., Baldin E. M., Barladyan A. K., Barnyakov A. Yu, Barnyakov M. Yu, Baru S. E., Basok I. Yu, Batrakov A. M., Blinov A. E., Blinov V. E., Bobrov A. V., Bobrovnikov V. S., Bogomyagkov A. V., Bondar A. E., Buzykaev A. R., Eidelman S. I., Grigoriev D. N., Groshev V. R., Glukhovchenko Yu M., Gulevich V. V., Gusev D. V., Karnaev S. E., Karpov G. V., Karpov S. V., Kharlamova T. A., Kiselev V. A., Kolmogorov V. V., Kononov S. A., Kotov K. Yu, Kravchenko E. A., Kudryavtsev V. N., Kulikov V. F., Kurkin G. Ya, Kuper E. A., Kuyanov I. A., Levichev E. B., Maksimov D. A., Malyshev V. M., Maslennikov A. L., Meshkov O. I., Mishnev S. I., Morozov I. I., Muchnoi N. Yu, Neufeld V. V., Nikitin S. A., Nikolaev I. B., Okunev I. N., Onuchin A. P., Oreshkin S. B., Orlov I. O., Osipov A. A., Ovtin I. V., Peleganchuk S. V., Pivovarov S. G., Piminov P. A., Petrov V. V., Poluektov A. O., Prisekin V. G., Rezanova O. L., Ruban A. A., Sandyrev V. K., Savinov G. A., Shamov A. G., Shatilov D. N., Shwartz B. A., Simonov E. A., Sinyatkin S. V., Skrinsky A. N., Sokolov A. V., Sukharev A. M., Starostina E. V., Talyshev A. A.

The ratio of the electron and muon widths of the J/ψ meson has been measured using direct J/ψ decays in the KEDR experiment at the VEPP-4M electron-positron collider. The result. Γe+e-(J/ψ)/Γμ+μ-(J/ψ)=1.0022±0.0044±0.0048(0.65%) is in good agreement with the lepton universality. The experience collected during this analysis will be used for J/ψ lepton width determination with up to 1% accuracy. © 2014 The Authors.