| Absolute photon energy calibration for the BESⅢ EMC |
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| 作者姓名： | 边渐鸣 何康林 李卫国 胡涛 傅成栋 黄彬 刘颖 吕绮雯 宁飞鹏 宋文博 孙胜森 徐敏 言杰 严亮 |
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| 作者单位： | Institute of High Energy Physics, CAS, Beijing 100049, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China;Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;Shanxi University, Taiyuan 003006, China |
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| 基金项目： | Supported by CAS Knowledge Innovation Project (U-602, U-34);;National Natural Science Foundation of China (10491300,10491303, 10605030) ;;100 Talents Program of CAS (U-25 and U-54) |
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| 摘 要： | The absolute energy calibration with photons from π0＇s for the BESⅢ EMC is discussed. Using 3 million hadronic events, the preliminary results are presented. Precision of about 1% in the photon energy measurement is obtained from crossing check using photons in ψ（2S）→γχc1,2（1P）.
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| 关 键 词： | 光子能量 北京谱仪 能量刻度 电磁兼容 ψ（2S） EMC 子事件 |
| 收稿时间： | 2009-03-02 |
| 修稿时间： | 2009-03-26 |
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