Absolute photon energy calibration for the BESⅢ EMC  

作　　者：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 

机构地区：[1]Institute of High Energy Physics, CAS [2]Graduate University of Chinese Academy of Sciences [3]Shanxi University [4]Department of Modern Physics, University of Science and Technology of China

出　　处：《Chinese Physics C》2010年第1期72-77,共6页中国物理C（英文版）

基　　金：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)

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）.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）.

关 键 词：electromagnetic calorimeter absolute energy calibration π0 decay. 

分 类 号：O572.212[理学—粒子物理与原子核物理]