Determination of event start time at BES

• Published in: Chinese physics C Vol. 32; no. 9; pp. 744 - 749
• Main Author: 马想 毛泽普 边渐鸣 曹国富 曹学香 陈申见 邓子艳 傅成栋 高原宁 何康林 何苗 花春飞 黄彬 黄性涛 季晓斌 李海波 李卫东 梁羽铁 刘春秀 刘怀民 刘秋光 刘锁 刘英杰 马秋梅 冒亚军 莫晓虎 潘明华 庞彩莹 平荣刚 秦刚 秦亚红 邱进发 孙胜森 孙永昭 王纪科 王亮亮 方硕频 伍灵慧 谢宇广 徐敏 严亮 尤郑昀 俞国威 苑长征 袁野 臧石磊 张炳云 张长春 张建勇 张学尧 张瑶 郑阳恒 朱科军 朱永生 朱志丽 邹佳恒
• Format: Journal Article
• Language: English
• Published: Institute of High Energy Physics,CAS,Beijing 100049,China 2008; Graduate Universitv of Chinge Academy of Sciences,Beijing 100049,Chin%Shandong University,Jinan 250100,China%Peking University,Beijing 100871,China%Liaoning University,Shenyang 110036,China%Guangxi Normal University,Guilin 541004,China%Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China%Institute of High Energy Physics,CAS,Beijing 100049,China; Institute of High Energy Physics,CAS,Beijing 100049,China%Tsinghua University,Beijing 100084,China%Zhengzhou University,Zhengzhou 450001,China%Institute of High Energy Physics,CAS,Beijing 100049,China; Nanjing University,Nanjing 210093,China%Institute of High Energy Physics,CAS,Beijing 100049,China%Tsinghua University,Beijing 100084,China; Graduate Universitv of Chinge Academy of Sciences,Beijing 100049,ChinaInstitute of High Energy Physics,CAS,Beijing 100049,China; Graduate Universitv of Chinge Academy of Sciences,Beijing 100049,China%Institute of High Energy Physics,CAS,Beijing 100049,China; CCAST(World Laboratory),Beijing 100080,China%Graduate Universitv of Chinge Academy of Sciences,Beijing 100049,China
• Subjects: 事件开始时间; 电子-正电子碰撞; 轨道重建; 高能物理学; drift-chamber; event start time; time-of-flight; track reconstruction
• ISSN: 1674-1137; 0254-3052

The principle of the method for the BESⅢ event start time determination and the code construction are described. The investigation of influence of the noise, the method of rejecting noise and the performance checking by the Monte Carlo physics data sample are also presented. The preliminary results got from the Monte Carlo simulation are presented, the reconstruction efficiency of J/ψ → anything events at noise level 0 - 60% can achieve above 99%, and the error rate is below 1%.