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Decay vertex reconstruction and 3-dimensional lifetime determination at BESⅢ

ISSN号：1674-1137
期刊名称：《中国物理C：英文版》
时间：0
分类：O157.5[理学—数学;理学—基础数学] O571.3[理学—粒子物理与原子核物理;理学—物理]
作者机构：[1]Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China, [2]Institute of High Energy Physics, CAS, Beijing 100049, China, [3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China, [4]Nanjing University, Nanjing 210093, China, [5]Tsinghua University, Beijing 100084, China, [6]Henan Normal University, Henan 453007, China, [7]Nanjing Normal University, Nanjing 210097, China, [8]Shandong University, Jinan 250100, China, [9]Peking University, Beijing 100871, China, [10]Guangxi University, Nanning 530004, China, [11]Shanxi University, Taiyuan 003006, China, [12]Zhengzhou University, Zhengzhou 450001, China
相关基金：Supported by CAS Knowledge Innovation Project （112901160333, 111087513811）, National Natural Science Foundation of China （10491300, 10491303） and 100 Talents Program of CAS （U-25 and U-54）

作者：徐敏[1,2], 何康林[2], 张子平[1], 王贻芳[2], 边渐鸣[2,3], 曹国富[2,3], 曹学香[2,3], 陈申见[4], 邓子艳[2], 傅成栋[2], 高原宁[5], 韩磊[6], 韩少卿[7], 何苗[2], 胡继峰[3], 胡小为[4], 黄彬[2,3], 黄性涛[8], 贾卢魁[2,3], 季晓斌[2], 李海波[2], 李卫东[2], 梁羽铁[9], 刘春秀[2], 刘怀民[2], 刘颖[10], 刘勇[2,3], 罗涛[2,3], 吕绮雯[11], 马秋梅[2], 马想[2,3], 冒亚军[9], 毛泽普[2], 莫晓虎[2], 宁飞鹏[11], 平荣刚[2], 邱进发[2], 宋文博[12], 孙胜森[2], 孙晓东[2,3], 孙永昭[2], 田浩来[2,3], 王纪科[2,3], 王亮亮[2,3], 文硕频[2], 伍灵慧[2,3], 吴智[2,3], 谢宇广[2], 言杰[1], 严亮[2,3], 姚剑[12], 苑长征[2], 袁野[2], 张长春[2], 张建勇[2], 张雷[4], 张学尧[8], 张瑶[2], 郑阳恒[3], 朱永生[2], 邹佳恒[8]

关键词：顶点, 衰变, 三维, 寿命测量, 最小二乘法, 拟合算法, 运动学, 粒子, decay vertex, resolution of decay length, lifetime, reconstruction efficiency

中文摘要：

This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as KS0,Λ,as well as on lifetime measurements using a 3-dimensional fit.The kinematic constraints between the production and decay vertices and the decay vertex fitting algorithm based on the least squares method are both presented.Reconstruction efficiencies including experimental resolutions are discussed.The results and systematic errors are calculated based on a Monte Carlo simulation.

英文摘要：

This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as Ks^0, A, as well as on lifetime measurements using a 3-dimensional fit. The kinematic constraints between the production and decay vertices and the decay vertex fitting algorithm based on the least squares method are both presented. Reconstruction efficiencies including experimental resolutions are discussed. The results and systematic errors are calculated based on a Monte Carlo simulation.

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