Report
Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)
| العنوان: | Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-) |
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| المؤلفون: | KEDR Collaboration, Anashin, V. V., Aulchenko, V. M., Baldin, E. M., Barladyan, A. K., Barnyakov, A. Yu., Barnyakov, M. Yu., Baru, S. E., Bedny, I. V., Beloborodova, O. L., 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., Kotov, K. Yu., Kravchenko, E. A., Kulikov, V. F., Kurkin, G. Ya., 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., Muchnoi, N. Yu., 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., 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., Todyshev, K. Yu., Tumaikin, G. M., Usov, Yu. V., Vorobiov, A. I., Yushkov, A. N., Zhilich, V. N., Zhulanov, V. V., Zhuravlev, A. N. |
| المصدر: | Phys.Lett.B685:134-140,2010 |
| سنة النشر: | 2009 |
| المجموعة: | High Energy Physics - Experiment |
| مصطلحات موضوعية: | High Energy Physics - Experiment |
| الوصف: | The products of the electron width of the J/\psi meson and the branching fraction of its decays to the lepton pairs were measured using data from the KEDR experiment at the VEPP-4M electron-positron collider. The results are \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV, \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV. Their combinations \Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100) keV, \Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can be used to improve theaccuracy of the leptonic and full widths and test leptonic universality. Assuming e\mu universality and using the world average value of the lepton branching fraction, we also determine the leptonic \Gamma_{ll}=5.59\pm0.12 keV and total \Gamma=94.1\pm2.7 keV widths of the J/\psi meson. Comment: 7 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.physletb.2010.01.057 |
| URL الوصول: | http://arxiv.org/abs/0912.1082 |
| رقم الانضمام: | edsarx.0912.1082 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.physletb.2010.01.057 |
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