Measurement of \(\Gamma_{ee}(J/\psi)\) with KEDR detector

Measurement of \(\Gamma_{ee}(J/\psi)\) with KEDR detector

The product of the electronic width of the \(J/\psi\) meson and the branching fractions of its decay to hadrons and electrons has been measured using the KEDR detector at the VEPP-4M \(e^+e^-\) collider. The obtained values are: \(\Gamma_{ee}(J/\psi) = 5.550 \pm 0.056 \pm 0.089 \, \text{keV}, \) \(\...

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Veröffentlicht in:arXiv.org 2018-01
Hauptverfasser: Anashin, V V, Aulchenko, V M, Baldin, E M, Barladyan, A K, A Yu Barnyakov, M Yu Barnyakov, Baru, S E, Bedny, I V, Blinov, A E, Blinov, V E, Bobrov, A V, Bobrovnikov, V S, Bogomyagkov, A V, Bondar, A E, Bondarev, D V, Buzykaev, A R, Eidelman, S I, Glukhovchenko, Yu M, Gulevich, V V, Gusev, D V, Karnaev, S E, Karpov, G V, Karpov, S V, Kharlamova, T A, Kiselev, V A, Kononov, S A, K Yu Kotov, Kravchenko, E A, Kulikov, V F, G Ya Kurkin, Kuper, E A, Levichev, E B, Maksimov, D A, Malyshev, V M, Maslennikov, A L, Medvedko, A S, Meshkov, O I, Mishnev, S I, Morozov, I I, N Yu Muchnoi, Neufeld, V V, Nikitin, S A, Nikolaev, I B, Okunev, I N, Onuchin, A P, Oreshkin, S B, Orlov, I O, Osipov, A A, Peleganchuk, S V, Pivovarov, S G, Piminov, P A, Petrov, V V, Poluektov, A O, Popkov, I N, 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, Skovpen, Yu I, Skrinsky, A N, Smaluk, V V, Sokolov, A V, Sukharev, A M, Starostina, E V, Talyshev, A A, Tayursky, V A, Telnov, V I, Tikhonov, Yu A, K Yu Todyshev, Tumaikin, G M, Usov, Yu V, Vorobiov, A I, Yushkov, A N, Zhilich, V N, Zhulanov, V V, Zhuravlev, A N, KEDR Collaboration
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Sprache:eng
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Hadrons
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Zusammenfassung:The product of the electronic width of the \(J/\psi\) meson and the branching fractions of its decay to hadrons and electrons has been measured using the KEDR detector at the VEPP-4M \(e^+e^-\) collider. The obtained values are: \(\Gamma_{ee}(J/\psi) = 5.550 \pm 0.056 \pm 0.089 \, \text{keV}, \) \(\Gamma_{ee}(J/\psi) \cdot \mathcal{B}_\text{hadrons}(J/\psi) = 4.884 \pm 0.048 \pm 0.078 \, \text{keV}, \) \(\Gamma_{ee}(J/\psi) \cdot \mathcal{B}_{ee}(J/\psi) = 0.3331 \pm 0.0066 \pm 0.0040 \, \text{keV}.\) The uncertainties shown are statistical and systematic, respectively. Using the result presented and the world-average value of the electronic branching fraction, one obtains the total width of the \(J/\psi\) meson: \(\Gamma = 92.94 \pm 1.83 \, \text{keV}.\) These results are consistent with the previous experiments.
ISSN:2331-8422
DOI:10.48550/arxiv.1801.01958