| Measurement of J/ψ→ηcγ at KEDR |
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| 作者姓名： | V. V. Anashin V. M. Aulchenko E. M. Baldin A. K. Barladyan A. Yu. Barnyakovet al |
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| 作者单位： | Budker Institute of Nuclear Physics, 11, Lavrentiev prospect, Novosibirsk, 630090, Russia; Novosibirsk State University, 2, Pirogova street, Novosibirsk, 630090, Russia; Novosibirsk State Technical University, 20, Karl Marx prospect, Novosibirsk, 630092, Russia |
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| 基金项目： | Supported by the Russian Foundation for Basic Research, grants 08-02-00258, 08-02-00258, and RF Presidential Grant for Sc. Sch. NSh-5655.2008.2 |
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| 摘 要： | We present a study of the inclusive photon spectra from 5.9 million J/ψ decays collected with the KEDR detector at the VEPP-4M e＋e collider. We measure the branching fraction of radiative decay J/ψ→ηcγ, ηc width and mass. Our preliminary results are： M（ηc） = 2979.4± 1.5 ± 1.9 MeV/c^2, Г（ηc） = 27.8±5.1 ±3.3 MeV, B（Jψ→ηcγ） = （2.34±0.15±0.40）%.
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| 关 键 词： | γ测量 衰变分支比 粒子衰变 包容性 探测器 对撞机 伏特 电子 |
| 收稿时间： | 2010-01-26 |
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