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Determination of event start time at BESⅢ

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Chinese Physics C 2008年第9期32卷 744-749页

作者：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文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 Institute of High Energy Physics CAS Nanjing University Tsinghua University Zhengzhou University Shandong University Peking University Liaoning University Guangxi Normal University Department of Modern Physics University of Science and Technology of China Graduate University of Chinese Academy of Sciences

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%.

关键词： event start time time-of-flight drift-chamber track reconstruction

Track reconstruction using the TSF method for the BESⅢ main drift chamber

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Chinese Physics C 2008年第7期32卷 565-571页

作者：刘秋光臧石磊李卫国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飞李海波李卫东梁羽铁刘春秀刘怀民刘锁刘英杰马秋梅马想冒亚军莫晓虎潘明华庞彩莹平荣刚秦纲秦亚红邱进发孙胜森孙永昭王纪科王亮亮文硕频伍灵慧谢宇广徐敏严亮尤郑昀愈国威苑长征袁野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 Institute of High Energy Physics CASBeijing 100049China Graduate University of Chinese Academy of SciencesBeijing 100049China University of Colorado BoulderColorado 80309USA Institute of High Energy Physics CASBeijing 100049China Nanjing University Nanjing 210093China Tsinghua University Beijing 100084China Institute of High Energy PhysicsCASBeijing 100049China Tsinghua University Beijing 100084China Zhengzhou University Zhengzhou 450001China Shandong University Jinan 250100China Peking University Beijing 100871China Liaoning University Shenyang 110036China Guangxi Normal University Guilin 541004China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics CASBeijing 100049China CCAST(World Laboratory)Beijing 100080China Graduate University of Chinese Academy of Sciences Beijing 100049China

We describe the algorithm to reconstruct the charged tracks for BESⅢ main drift chamber at BEPCⅡ, including the track finding and fitting. With a new method of the Track Segment Finder （TSF）, the results of present study indicate that the algorithm can reconstruct the charged tracks over a wide range of momentum with high efficiency, while improving the robustness against the background noise in the drift chamber. The overall performances, including spatial resolution, momentum resolution and secondary vertices reconstruction efficiency, etc. satisfy the requirements of BESⅢ experiment.

关键词： BESⅢ detector track reconstruction track segment finder conformal transformation secondary vertex

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诗词月刊 2011年第1期 67-74页

作者：柴国兰张运珠郑瑞群乔志贤刘振华李彩霞李葆英许端一李传代李祥陆瑞英唐加成周鸿鹤苏智广李瑶朱长华周必学苏子农童玉娥童宇平江康林程桂芝沈方安陈贤楼刘世太吕约翰桑盛庭邰政李传谋王泽民曹新平杨双禄常晓河左从华樊胜堂陈建华薛继根梁国钧陈信民郭文龙邝启明周作柱胡章林唐善娥黄利民黄国华骆生加王小英邝生浩邝俊金谭代富罗少侠唐冬柏谭昌辉缪其明

Calibration of RPC-based muon detector at BESⅢ

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Chinese Physics C 2010年第3期34卷 344-353页

作者：谢宇广李卫东梁羽铁尤郑昀冒亚军张家文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飞李海波刘春秀刘怀民刘秋光刘锁刘英杰马秋梅马想毛泽普莫晓虎潘明华庞彩莹平荣刚秦亚红邱进发孙胜森孙永昭王纪科王亮亮文硕频伍灵慧徐敏严亮苑长征袁野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 Institute of High Energy Physics CAS Graduate University of Chinese Academy of Sciences Peking University Nanjing University Tsinghua University Zhengzhou University Shandong University Liaoning University Guangxi Normal University Department of Modern Physics University of Science and Technology of China

The calibration algorithm for RPC-based muon detector at BESIII has been developed. The calibration method, calibration error and algorithm performance are studied. The primary results of efficiency and noise at layer, module and strip levels have been calibrated with cosmic ray data. The calibration constants are available for simulation and reconstruction tuning. The results of Monte Carlo and data are also compared to check the validation and reliability of the algorithm.

关键词： calibration RPC BESIII muon detector efficiency noise

BESⅢ track fitting algorithm

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Chinese Physics C 2009年第10期33卷 870-879页

作者：王纪科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飞李海波李卫东梁羽铁刘春秀刘怀民刘锁刘英杰马秋梅马想冒亚军莫晓虎潘明华庞彩莹平荣刚秦亚红邱进发孙胜森孙永昭王亮亮文硕频伍灵慧谢宇广徐敏严亮尤郑昀苑长征袁野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 Institute of High Energy Physics CAS Graduate University of Chinese Academy of Sciences Nanjing University Tsinghua University Zhengzhou University Shandong University Peking University Beijing 100871China Liaoning University Guangxi Normal University Department of Modern Physics University of Science and Technology of China

A track fitting algorithm based on the Kalman filter method has been developed for BESⅢ of BEPCⅡ. The effects of multiple scattering and energy loss when the charged particles go through the detector, non-uniformity of magnetic field （NUMF） and wire sag, etc., have been carefully handled. This algorithm works well and the performance satisfies the physical requirements tested by the simulation data.

关键词： BESⅢ main drift chamber track fitting algorithm Kalman filter method

Software alignment of the BESⅢ main drift chamber using the Kalman Filter method

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Chinese Physics C 2009年第3期33卷 210-216页

作者：王纪科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飞李海波李卫东梁羽铁刘春秀刘怀民刘锁刘英杰马秋梅马想冒亚军莫晓虎潘明华庞彩莹平荣刚秦亚红邱进发孙胜森孙永昭王亮亮文硕频伍灵慧谢宇广徐敏严亮尤郑昀苑长征袁野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 Institute of High Energy Physics CAS Graduate University of Chinese Academy of Sciences Nanjing University Tsinghua University Zhengzhou University Shandong University Peking University Liaoning University Guangxi Normal University Department of Modern Physics University of Science and Technology of China

Software alignment is quite important for a tracking detector to reach its ultimate position accuracy and momentum resolution. We developed a new alignment algorithm for the BESⅢ Main Drift Chamber using the Kalman Filter method. Two different types of data which are helix tracks and straight tracks are used to test this algorithm, and the results show that the design and implementation is successful.

关键词： BESⅢ main drift chamber tracking detector alignment Kalman Filter method

Study of BESⅢ MUC offine software with cosmic-ray data

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Chinese Physics C 2009年第7期33卷 562-566页

作者：梁羽铁冒亚军尤郑昀李卫东边渐鸣曹国富曹学香陈申见邓子艳傅成栋高原宁韩磊韩少卿何康林何苗胡继峰胡小为黄彬黄性涛贾卢魁季晓斌李海波刘北江刘春秀刘怀民刘颖刘勇罗涛吕绮雯马秋梅马想毛泽普莫晓虎宁飞鹏平荣刚邱进发宋文博孙胜森孙晓东孙永昭田浩来王纪科王亮亮文硕频伍灵慧吴智谢宇广徐敏言杰严亮姚剑苑长征袁野张长春张建勇张雷张学尧张瑶郑阳恒朱永生邹佳恒 School of Physics and State Key Laboratory of Nuclear Physics & Technology Peking University Institute of High Energy Physics CAS Graduate University of Chinese Academy of Sciences Nanjing University Tsinghua University Henan Normal University Nanjing Normal University Shandong University Guangxi University Shanxi University Zhengzhou University Department of Modern Physics University of Science and Technology of China

Cosmic-ray data of 90 M events have been collected and used for calibration,alignment as well as detector tuning. A special tracking algorithm for the BESⅢ muon counter is developed and verified with Monte-Carlo simulation and then further confirmed with the cosmic-ray data. The obtained strip resolutions are in good agreement with the design values. A new alignment approach for the BESⅢ muon counter is confirmed with the cosmic-ray data and proposed to be used in future analysis of experimental data.

关键词： Muon counter reconstruction cosmic-ray alignment

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诗词月刊 2012年第1期 62-75页

作者：黄雅莫德诩曾昭藩梁水娟陶利邓水明邓永天陈贤华肖汉滨董尚荣梁朝礼陈燕芳周伟兴周霭忠黄国光李宗奎朱至芳魏木贤车海龄陈清张乃飞陈勋翠黄月英汪文辉杨奕平郑友顺王珉陈继豪马海涛苏洋那成章伟钟刘关祥韩非子齐文斌牧之羊范庆贺陈克林李彩霞袁维胜刘振华张运珠郑瑞群张成荣陆瑞英周必学柴国兰聂敬云孙守英王景云许端一李葆英李瑶乔志贤周必诠李传代黄利民葛本霞白翠萍陈宣朝甘家骏刘隆炎苏智广苏子农童工娥重宇平桑盛庭李传谋沈芳安邰政江康林樊胜堂陈建华王泽民程桂芝吕约翰刘世太薛继根常晓河陈贤楼丁祖谋孔德胜饶纯忠梁国钧吴兴泉左从华曹新干李二青杨双禄刘漫漫

Measurement of J/ψ decays into Λ■ π^+π^-

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Chinese Physics C 2012年第11期36卷 1031-1039页

作者：阿布里克木.麦迪娜白景芝白羽班勇蔡啸陈宏芳陈和生陈江川陈进陈元柏陈初萍戴又善邓子艳杜书先方建傅成栋高原宁顾运厅郭子敬 F.A.Huarris 何康林何瑁衡月昆胡海明 T.Hussain 胡涛黄光顺黄性涛黄燕萍季晓斌江晓山焦健斌金大鹏金山李刚李海波李金李蕾李仁英李卫东李卫国李晓玲李小男李学潜梁勇飞刘北江刘春秀刘芳刘峰刘宏邦刘怀民刘觉平刘倩刘荣光刘振安吕峰鲁公儒吕军光罗成林马凤才马海龙马秋海 M.Q.A.Malik 毛泽普莫晓虎聂晶 S.L.Olsen 平荣刚邱进发荣刚阮向东单连友尚雷沈成平沈肖雁盛华义孙海生孙胜森孙永昭孙志嘉唐晓田俊平 G.S.Varner 万霞王岚王亮亮王灵淑王平王佩良王贻芳王铮王至勇魏诚林魏代会吴宁许国发俆新平俆晔阎沐霖杨洪勋杨明杨永栩叶铭汉叶云秀喻纯旭苑长征袁野曾云张丙新张炳云张长春张达华张华桥章红宇张家文张建勇张学尧张一云张子平赵京伟赵明刚赵平平赵政国郑波郑海青郑建平郑志鹏钟彬周莉朱科军朱启明朱兴旺朱永生朱自安邹冰松 Institute of High Energy Physics Peking University University of Science and Technology of China Zhejiang University Zhengzhou University Tsinghua University Guangxi University University of Hawaii Honolulu Johns Hopkins University Shandong University Centre for High Energy Physics University of the Punjab Nankai University Sichuan University Huazhong Normal University Wuhan University Graduate University of Chinese Academy of Sciences Henan Normal University Nanjing Normal University Liaoning University Seoul National University Nagoya University Guangxi Normal University Soochow University China Center of Advanced Science and Technology Hunan University

Based on 58 million J/ψ events collected by the BESⅡ detector at the BEPC, J/ψ→ΛΛ π＋π- is observed for the first time. The branching fraction is measured to be Br（J/ψ→ΛΛ π＋π-）=（4.30±0.13±0.99）×10-3, excluding the decays to intermediate states, namely J/ψ→Ξ-Ξ＋, J/ψ→Σ（1385）-Σ（1385）＋, and J/ψ→Σ（1385）＋Σ（1385）-. The branching fractions for these intermediate resonance channels are measured to be：Br（J/ψ→Ξ-Ξ＋）=（0.90±0.03±0.18）×10-3, Br（J/ψ→Σ（1385）-Σ（1385）＋）=（1.23±0.07±0.30）×10-3,and Br（J/ψ→Σ（1385）＋Σ（1385）-）=（1.50±0.08±0.38）×10-3, respectively. The angular distribution is of the form dN/d（cosθ）α（1＋αcos2θ） with α=（0.35±0.29±0.06） for J/ψ→Ξ-Ξ＋, α=（-0.54±0.22±0.10） for J/ψ→Σ（1385）-Σ（1385）＋, and α=（-0.35±0.29±0.06） for J/ψ→Σ（1385）＋Σ（1385）-.

关键词： baryonic decays branching fraction alpha distribution