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Chinese Physics C> 2007, Vol. 31> Issue(8) : 703-707 

Separation of the Beam Associated Sample from Raw Data

  •  Institute of High Energy Physics, CAS, Beijing 100049, China2 Institute of Science, Jinan University, Ji'nan 250022, China3 College of Physics and Electronic Engineering, Guangxi Normal University, Guilin 541004, China4 Department of Engineering Physics, Tsinghua University, Beijing 100084, China

  • The uncertainty of the treatment for the beam associated backgrounds is one of the dominant errors in the previous R measurement at BES/BEPC. A new method is developed to separate the beam associated sample from the raw data, and this sample is used in tuning the parameters of the hadronic generator LUARLW. This improvement can decrease the systematic error of the selection efficiency of hadronic events, and improve the precision of the R value.
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    [1] . ZHAO Z G. Int. J. Mod. Phys., 2000, A15: 37392. BAI J Z el al. Phys. Rev. Lett., 2000, 84: 5943. BAI J Z el al. Phys. Rev. Lett., 2002, 88: 1018024. Edwards C el al. SLAC-PUB-5160, 19905. Osterheld A. SLAC Report No. SLAC-PUB-4160, 19866. Andersson B, HU Hai-Ming. hep-ph/99102857. HU Hai-Ming et al. HEP NP, 2001, 25: 1035-1043(in Chinese)(胡海明等.高能物理与核物理，2001, 25: 1035-1043)8. Sjostrand T. CERN-TH.7112/93

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WENG Yao, HU Hai-Ming, GUO Yi-Qing, ZHANG Bing-Xin, JIN Yi, HU Jun-Hui and GAO Yuan-Ning. Separation of the Beam Associated Sample from Raw Data[J]. Chinese Physics C, 2007, 31(8): 703-707.
WENG Yao, HU Hai-Ming, GUO Yi-Qing, ZHANG Bing-Xin, JIN Yi, HU Jun-Hui and GAO Yuan-Ning. Separation of the Beam Associated Sample from Raw Data[J]. Chinese Physics C, 2007, 31(8): 703-707. shu
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Received: 2006-09-29
Revised: 2006-11-27
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Separation of the Beam Associated Sample from Raw Data

    Corresponding author: WENG Yao,
  • Institute of High Energy Physics, CAS, Beijing 100049, China2 Institute of Science, Jinan University, Ji'nan 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: 2006-09-29
  • Accepted Date: 2006-11-27
  • Available Online: 2007-08-05

Abstract: The uncertainty of the treatment for the beam associated backgrounds is one of the dominant errors in the previous R measurement at BES/BEPC. A new method is developed to separate the beam associated sample from the raw data, and this sample is used in tuning the parameters of the hadronic generator LUARLW. This improvement can decrease the systematic error of the selection efficiency of hadronic events, and improve the precision of the R value.

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