| Measurement of J/ψ leptonic width with the KEDR detector |
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| 作者姓名： | A. G. Shamov |
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| 作者单位： | Budker Institute of Nuclear Physics, 11, Lavrentiev prospect, Novosibirsk, 630090, Russia |
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| 基金项目： | Supported by the Russian Foundation for Basic Research, Grants 08-02-00258, 09-02-08537 and RF Presidential Grant for Sc. Sch. NSh-5655.2008.2 |
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| 摘 要： | 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： Гee×Гee/P = 0.3323±0.0064 （stat.）±0.0048 （syst.） keV,Гee×Гμμ/Г = 0.3318±0.0052 （stat.） ±0.0063 （syst.） keY. Assuming eμ universality and using the table value of the branching ratios the leptonic Г11 = 5.59 ± 0.12 keV width and the total Г = 94.1±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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| 关 键 词： | 宽度测量 探测器 轻子 精确测定 共振辐射 psi 对撞机 测量值 |
| 收稿时间： | 2010-2-5 |
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