Decay vertex reconstruction and 3-dimensional lifetime determination at BESEIII

Min Xu, Kang Lin He, Zi Ping Zhang, Yi Fang Wang, Jian Ming Bian, Guo Fu Cao, Xue Xiang Cao, Shen Jian Chen, Zi Yan Deng, Cheng Dong Fu, Yuan Ning Gao, Lei Han, Shao Qing Han, Miao He, Ji Feng Hu, Xiao Wei Hu, Bin Huang, Xing Tao Huang, Lu Kui Jia, Xiao Bin JiHai Bo Li, Wei Dong Li, Yu Tie Liang, Chun Xiu Liu, Huai Min Liu, Ying Liu, Yong Liu, Tao Luo, Qi Wen Lu, Qiu Mei Ma, Xiang Ma, Ya Jun Mao, Ze Pu Mao, Xiao Hu Mo, Fei Peng Ning, Rong Gang Ping, Jin Fa Qiu, Wen Bo Song, Sheng Sen Sun, Xiao Dong Sun, Yong Zhao Sun, Hao Lai Tian, Ji Ke Wang, Liang Liang Wang, Shuo Pin Wen, Ling Hui Wu, Zhi Wu, Yu Guang Xie, Jie Yan, Liang Yan, Jian Yao, Chang Zheng Yuan, Ye Yuan, Chang Chun Zhang, Jian Yong Zhang, Lei Zhang, Xue Yao Zhang, Yao Zhang, Yang Heng Zheng, Yong Sheng Zhu, Jia Heng Zou

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as K0s, 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.

Original languageEnglish (US)
Pages (from-to)428-435
Number of pages8
JournalChinese Physics C
Volume33
Issue number6
DOIs
StatePublished - Jun 2009

Keywords

  • Decay vertex
  • Lifetime
  • Reconstruction efficiency
  • Resolution or decay length

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