Measurement Of The Ratio Of The Lepton Widths Gamma(Ee)/Gamma(Mu Mu) For The J/Psi Meson

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

PHYSICS LETTERS B（2014）

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摘要

The ratio of the electron and muon widths of the J/psi meson has been measured using direct J/psi decays in the KEDR experiment at the VEPP-4M electron-positron collider. The resultGamma(e+e-)(J/psi)/Gamma(mu+mu-)(J/psi) = 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/psi lepton width determination with up to 1% accuracy. (C) 2014 The Authors. Published by Elsevier B.V.

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关键词

J/psi meson,Lepton width,Lepton universality

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