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Luminosity monitoring and calibration of BLM |
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| Authors: | XUE Zhen XU Zi-Zong WANG Xiao-Lian HU Tao WANG Zhi-Yong FU Cheng-Dong YAN Wen-Biao L Jun-Guang ZHOU Li CAI Xiao YU Bo-Xiang FANG Jian SUN Xi-Lei SHI Feng WANG Zhi-Gang AN Zheng-Hua SUN Li-Jun LIU Hong-Bang ZHANG Ai-Wu WANG Xiao-Dong |
| Affiliation: | 1. Laboratory of High Energy Physics,Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China 2. Laboratory of High Energy Physics,Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China 3. Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China |
| Abstract: | The BEPCⅡLuminosity Monitor(BLM)monitors relative luminosity per bunch.The counting rates of gamma photons,which are proportional to the luminosities from the BLM at the center of mass system energy of the ψ(3770)resonance,are obtained with a statistical error of 0.01% and a systematic error of 4.1%.Absolute luminosities are also determined by the BESⅢ End-cap Electro-Magnetic Calorimeter(EEMC)using Bhabha events with a statistical error of 2.3% and a systematic error of 3.5%.The calibration constant between the luminosities obtained with the EEMC and the counting rates of the BLM are found to be 0.84±0.03(x1026 cm-2·count-1).With the calibration constant,the counting rates of the BLM can be scaled up to absolute luminosities. |
| Keywords: | luminosity luminosity monitor EEMC Bhabha scattering cross-section |
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