Physical Design of Main Drift Chamber Trigger for BESⅢ Experiment

XU Hao; LIU Zhen-An; JIN Da-Peng; WANG Da-Yong; ZHAO Di-Xin; GUO Ya-Nan

Chinese Physics C> 2005, Vol. 29> Issue(4) : 376-382

Physical Design of Main Drift Chamber Trigger for BESⅢ Experiment

Institute of High Energy Physics,CAS,Beijing 100049,China2 Graduate School of the,CAS,Beijing 100049,China

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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.

References

[1]

. Prel iminary Design Report of the BES-Detect or. IHEP..BEPC-SB-13, 2004. 14 -71; 99 -129; 298-3192. LIU Zhen-An.Preliminary Design of BES-Trigger System. In: CHENH S ed. Proceedings of CHEP 2001, Int ernational Conference on Computing in High Energy and Nuclear Physics. Beijing, P. R. China,Sep. 2001. Beijing New York: Science Press, 2001. 642-6463. JIN Da-Peng. Beam-Related Backgrounds Study in the BEPC /BES Ⅲ In: Doctoral Dissertat ion, Graduate School of the Chinese Academy of Science. Beijing, 2004. 56-92 (in Chinese)(金大鹏北京正负电子对撞机/北京谱仪的束流相关本底研究.中国科学院研究生院博士学位论文，北京，2004. 56-92)4. Review of Particle Physics. The European Physical Journal , 2000,C15( 1 -4) : 150-156

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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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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2004-07-20
Accepted Date: 1900-01-01
Available Online: 2005-04-05

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.