Measurement Of Gamma(Ee) X B Mu Mu For Psi(2s) Meson

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

PHYSICS LETTERS B（2018）

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摘要

The product of the electronic width of the psi(2S) meson and the branching fraction of its decay to the muon pair was measured in the e(+)e(-) -> psi(2S) -> mu(+)mu(-) process using nine data sets corresponding to an integrated luminosity of about 6.5 pb(-1) collected with the KEDR detector at the VEPP-4M electron-positron collider:Gamma(ee) x B-mu mu = 19.3 +/- 0.3 +/- 0.5 eV.Adding the previous KEDR results on hadronic and leptonic channels, the values of the psi(2S) electronic width were obtained under two assumptions: either with the assumption of lepton universalityGamma(ee) = 2.282 +/- 0.015 +/- 0.042 keV.Gamma(ee) = 2.282 +/- 0.015 +/- 0.042 keV. (c) 2018 The Author(s). Published by Elsevier B.V.

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关键词

psi(2S) meson, Leptonic width, Branching fraction

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