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  • Measurement of $\Gamma_{ee}\times\mathcal{B}_{\mu\mu}$ for $\psi(2S)$ meson
    Anashin, V. V; Anchugov, O. V; Aulchenko, V. M; Baldin, E. M; Baranov, G. N; Barladyan, A. K; Barnyakov, A. Yu; Barnyakov, M. Yu; Baru, S. E; Basok, I. Yu; Batrakov, A. M; Bekhtenev, E. A; Blinov, A. E; Blinov, V. E; Bobrov, A. V; Bobrovnikov, V. S; Bogomyagkov, A. V; Bondar, A. E; Buzykaev, A. R; Cheblakov, P. B; Dorohov, V. L; Eidelman, S. I; Grigoriev, D. N; Glukhov, S. A; Karnaev, S. E; Karpov, G. V; Karpov, S. V; Karukina, K. Yu; Kashtankin, D. P; Kharlamova, T. A; Kiselev, V. A; Kolmogorov, V. V; Kononov, S. A; Kotov, K. Yu; Krasnov, A. A; Kravchenko, E. A; Kudryavtsev, V. N; Kulikov, V. F; Kurkin, G. Ya; Kuyanov, I. A; Kuper, E. A; Levichev, E. B; Maksimov, D. A; Malyshev, V. M; Maslennikov, A. L; Meshkov, O. I; Mishnev, S. I; Morozov, I. A; Morozov, I. I; Muchnoi, N. Yu; Nikitin, S. A; Nikolaev, I. B; Okunev, I. N; Onuchin, A. P; Oreshkin, S. B; Osipov, A. A; Ovtin, I. V; Peleganchuk, S. V; Pivovarov, S. G; Piminov, P. A; Petrov, V. V; Prisekin, V. G; Rezanova, O. L; Ruban, A. A; Savinov, G. A; Shamov, A. G; Shatilov, D. N; Shvedov, D. A; Shwartz, B. A; Simonov, E. A; Sinyatkin, S. V; Skrinsky, A. N; Sokolov, A. V; Sukhanov, D. P; Sukharev, A. M; Starostina, E. V; Talyshev, A. A; Tayursky, V. A; Telnov, V. I; Tikhonov, Yu. A; Todyshev, K. Yu; Tribendis, A. G; Tumaikin, G. M; Usov, Yu. V; Vorobiov, A. I; Zhilich, V. N; Zhukov, A. A; Zhulanov, V. V; Zhuravlev, A. N

    01/2018
    Journal Article

    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 $e^{+}e^{-} \to \psi(2S) \to \mu^{+}\mu^{-}$ 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}\times\mathcal{B}_{\mu\mu} = 19.3 \pm 0.3 \pm 0.5 ~\text{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 universality \ \Gamma_{ee} = 2.279 \pm 0.015 \pm 0.042 ~\text{keV} \ or without it, summing up hadronic and three independent leptonic channels: \ \Gamma_{ee} = 2.282 \pm 0.015 \pm 0.042 ~\text{keV}. \

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