Improvement on Hadronic Event Selection in R Measurement

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HU Hai-Ming, WENG Yao, GUO Yi-Qing, JIN Yi, ZHANG Bing-Xin, HU Jun-Hui and GAO Yuan-Ning. Improvement on Hadronic Event Selection in R Measurement[J]. Chinese Physics C, 2007, 31(9): 802-809.
HU Hai-Ming, WENG Yao, GUO Yi-Qing, JIN Yi, ZHANG Bing-Xin, HU Jun-Hui and GAO Yuan-Ning. Improvement on Hadronic Event Selection in R Measurement[J]. Chinese Physics C, 2007, 31(9): 802-809. shu
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Received: 2006-10-19
Revised: 2007-03-22
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Improvement on Hadronic Event Selection in R Measurement

    Corresponding author: HU Hai-Ming,
  • Institute of High Energy Physics, CAS, Beijing 100049, China2 Institute of Science, Jinan University, Jinan 250022, China3 College of Physics and Electronic Engineering, Guangxi Normal University, Guilin 541004, China4 Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Abstract: Hadronic event selection and hadronic detection efficiency are two main sources of systematic error for the R measurement at BES/BEPC. If only the hadronic events with 2-prong and higher prong are selected as done in the previous measurements, the lost events with 0-prong and 1-prong will cause the systematic error for both of the number of hadronic events and the detection efficiency. This paper aims to present a new method to select the 1-prong hadronic events. It will be helpful to tune the parameters in hadronic events generator LUARLW more reasonably, and decrease the systematic errors of hadronic efficiency in R measurement.

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