1. Measurement of Γee×Bμμ for ψ(2S) meson
- Author
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E.V. Starostina, G.V. Karpov, V.L. Dorohov, A.I. Vorobiov, Andrey Sokolov, G.N. Baranov, A.G. Tribendis, A. E. Blinov, A.A. Osipov, S.I. Eidelman, B.A. Shwartz, Tatyana Kharlamova, V.G. Prisekin, Vladimir Zhulanov, S.E. Baru, G.Ya. Kurkin, A.K. Barladyan, M.Yu. Barnyakov, A.M. Batrakov, A.N. Zhuravlev, I.V. Ovtin, K.Yu. Kotov, O.V. Anchugov, A. P. Onuchin, K. Yu. Todyshev, D.N. Grigoriev, I.I. Morozov, V.V. Anashin, V. M. Malyshev, D.A. Shvedov, I.N. Okunev, D.P. Kashtankin, I.A. Morozov, A.Yu. Barnyakov, E. A. Simonov, A.N. Skrinsky, N. Yu. Muchnoi, S.A. Nikitin, V. Kudryavtsev, Valery I. Telnov, A.E. Bondar, Evgenii Baldin, V.V. Kolmogorov, Alexey Buzykaev, Evgeny Levichev, Yu. A. Tikhonov, Dmitry Shatilov, Yu. V. Usov, Alexey Talyshev, S. A. Glukhov, A.A. Krasnov, A.M. Sukharev, I. B. Nikolaev, V.F. Kulikov, A.A. Zhukov, E.A. Kuper, Sergey Sinyatkin, Vladimir Blinov, Sergey Peleganchuk, Pavel Piminov, V.A. Tayursky, S. I. Mishnev, G.A. Savinov, S.G. Pivovarov, A.G. Shamov, S.B. Oreshkin, D.P. Sukhanov, I.Yu. Basok, A.V. Bogomyagkov, I. A. Kuyanov, V.M. Aulchenko, V. S. Bobrovnikov, K.Yu. Karukina, V.N. Zhilich, Oleg Meshkov, S.A. Kononov, G.M. Tumaikin, S.V. Karpov, V. A. Kiselev, E. A. Kravchenko, V. V. Petrov, E.A. Bekhtenev, Olga Rezanova, D.A. Maksimov, P.B. Cheblakov, A. Bobrov, A.A. Ruban, Sergey Karnaev, and Alexey Maslennikov
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Muon ,Meson ,010308 nuclear & particles physics ,Branching fraction ,Electron–positron annihilation ,Hadron ,01 natural sciences ,0103 physical sciences ,High Energy Physics::Experiment ,010306 general physics ,Lepton - Abstract
The product of the electronic width of the ψ(2S) meson and the branching fraction of its decay to the muon pair was measured in the e + e − → ψ (2S) → μ + μ − 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: Γ e e × B μ μ = 19.3 ± 0.3 ± 0.5 eV . Adding the previous KEDR results on hadronic and leptonic channels, the values of the ψ(2S) electronic width were obtained under two assumptions: either with the assumption of lepton universality Γ e e = 2.279 ± 0.015 ± 0.042 keV or without it, summing up hadronic and three independent leptonic channels Γ e e = 2.282 ± 0.015 ± 0.042 keV .
- Published
- 2018
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