Improvement on Hadronic Event Selection in R Measurement

HU Hai-Ming; WENG Yao; GUO Yi-Qing; JIN Yi; ZHANG Bing-Xin; HU Jun-Hui; GAO Yuan-Ning

Chinese Physics C> 2007, Vol. 31> Issue(9) : 802-809

Improvement on Hadronic Event Selection in R Measurement

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

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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.

References

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. BES Collaboration(BAI J Z et al.). Nucl. Instrum. MethodsPhys. Res., Sect., 2001, A458: 6272. BES Collaboration(BAI J Z et al.). Phys. Rev. Lett., 2000,84: 5943. BES Collaboration(BAI J Z et al.). Phys. Rev. Lett., 2002,88: 1018024. HU Hai-Ming et al. HEP NP, 2001, 25(11): 1035-1043(in Chinese)(胡海明等.高能物理与核物理,2001,25(11):1035—1043)5. Torbjorn Sjostrand, CERN-TH.7112/936. ZHU Yong-Sheng. Probability and Statistics in Experimen-tal Physics. Beijing: Science Press, 2006. 1497. Siegrist J L et al. Phys. Rev., 1982, D26: 9698. HUANG Guang-Shun. Post Dodctor Report, Chinese Center of Advanced Science of Technology, 2001

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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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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2006-10-19
Accepted Date: 2007-03-22
Available Online: 2007-09-05

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.