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arXiv · 1110.0328

Measurement of J/psi leptonic width with the KEDR detector

V. V. Anashin·V. M. Aulchenko·E. M. Baldin·A. K. Barladyan·A. Yu. Barnyakov·M. Yu. Barnyakov·S. E. Baru·I. Yu. Basok·O. L. Beloborodova·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·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·E. B. Levichev·D. A. Maksimov·V. M. Malyshev·A. L. Maslennikov·A. S. Medvedko·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·S. V. Peleganchuk·S. G. Pivovarov·P. A. Piminov·V. V. Petrov·A. O. Poluektov·V. G. Prisekin·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·V. V. Smaluk·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·A. N. Yushkov·V. N. Zhilich·V. V. Zhulanov·A. N. Zhuravlev
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Abstract

We report a new precise determination of the leptonic widths of the J/psi meson performed with the KEDR detector at the VEPP-4M $e^{+}e^{-}$ collider. The measured values of the J/psi parameters are: Γ_{ee}\timesΓ_{ee}/Γ= 0.3323 \pm 0.0064 (stat.) \pm 0.0048 (syst.) keV Γ_{ee}\timesΓ_{μμ}/Γ=0.3318 \pm 0.0052 (stat.) \pm 0.0063 (syst.) keV. Assuming $eμ$ universality and using the table value of the branching ratios the leptonic Γ_{ll}= 5.59 \pm 0.12 keV width and the total Γ=94.1 \pm 2.7 keV widths were obtained. We also discuss in detail a method to calculate radiative corrections at a narrow resonance.

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V. V. Anashin, V. M. Aulchenko, E. M. Baldin, A. K. Barladyan, A. Yu. Barnyakov, M. Yu. Barnyakov, S. E. Baru, I. Yu. Basok, O. L. Beloborodova, 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, 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, E. B. Levichev, D. A. Maksimov, V. M. Malyshev, A. L. Maslennikov, A. S. Medvedko, 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, S. V. Peleganchuk, S. G. Pivovarov, P. A. Piminov, V. V. Petrov, A. O. Poluektov, V. G. Prisekin, 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, V. V. Smaluk, 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, A. N. Yushkov, V. N. Zhilich, V. V. Zhulanov, A. N. Zhuravlev. 2011-10-03. Measurement of J/psi leptonic width with the KEDR detector. https://arxiv.org/abs/1110.0328

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