Absolute photon energy calibration for the BESIH EMC

• 作 者: BIAN Jian-Ming HE Kang-Lin LI
• 机 构: Institute of High Energy Physics,Graduate University of Chinese Academy of Sciences,L(U) Qi-Wen,Depa
• 出 处: 中国物理C（英文版）
• 发表日期: 2004年期
• 关键词: electromagnetic calorimeter absolute energy calibration π~0 decay.

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).