Measurement of J/ψ leptonic width with the KEDR detector |
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作者姓名: | A. G. Shamov (KEDR collaboration) |
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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: | 2010-02-05 |
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