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Absolute photon energy calibration for the BESIH EMC |
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| Authors: | BIAN Jian-Ming HE Kang-Lin LI Wei-Guo HU Tao FU Cheng-Dong HUANG Bin LIU Ying L Qi-Wen NING Fei-Peng SONG Wen-Bo SUN Sheng-Sen XU Min YAN Jie YAN Liang |
| Institution: | 1. Institute of High Energy Physics, CAS, Beijing 100049, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China 2. Institute of High Energy Physics, CAS, Beijing 100049, China 3. Shanxi University, Taiyuan 003006, China 4. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China |
| Abstract: | The absolute energy calibration with photons from π~0'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) →γχ_(c1,2)(1.P). |
| Keywords: | electromagnetic calorimeter absolute energy calibration |
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