Physical Design of Main Drift Chamber Trigger for BESⅢ Experiment

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XU Hao, LIU Zhen-An, JIN Da-Peng, WANG Da-Yong, ZHAO Di-Xin and GUO Ya-Nan. Physical Design of Main Drift Chamber Trigger for BESⅢ Experiment[J]. Chinese Physics C, 2005, 29(4): 376-382.
XU Hao, LIU Zhen-An, JIN Da-Peng, WANG Da-Yong, ZHAO Di-Xin and GUO Ya-Nan. Physical Design of Main Drift Chamber Trigger for BESⅢ Experiment[J]. Chinese Physics C, 2005, 29(4): 376-382. shu
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Received: 2004-07-20
Revised: 1900-01-01
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Physical Design of Main Drift Chamber Trigger for BESⅢ Experiment

    Corresponding author: XU Hao,
  • Institute of High Energy Physics,CAS,Beijing 100049,China2 Graduate School of the,CAS,Beijing 100049,China

Abstract: this article describes the design and simulation of the scheme of main drift chamber (mdc) trigger for besⅢ (beijing spectrometer Ⅲ). the algorithm of mdc trigger includes 3 steps: track segments finding (tsf), track finding (tf) and trigger condition formation of mdc tracks. these trigger conditions are studied carefully and the trigger parameters are optimized through simulation. trigger efficiencies vs. p_t ,vertex position r–φ and z are presented. trigger efficiency exceeds 99% for J/ψ events and some important physics channels. the rejection of beam–related backgrounds exceeds 99.99% and the rate of cosmic rays is about 18hz.

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