Decay vertex reconstruction and 3-dimensional lifetime determination at BESIII

Xu Min,Zhang Lei,Ma Xiang,Liu Ying,Zhang Yao,He Miao,Yan Liang,Huang Bin,Liu Yong,Cheng Dong Fu ,Huai Min Liu ,X T Huang ,L Han ,Qiu Mei ,Y Xie ,Hai Bo Li ,J F Hu ,Yang Sun ,X Hu ,Ziping Zhang ,Chun Xiu Liu ,Liang Liang Wang ,Jingwen Yao ,Zhi Wang ,Xiao Bin Ji ,G F Cao ,R G Ping ,Jian Ming Bian ,Lu Jia ,Y Yuan ,Kang He ,Jin Fa Qiu ,Shuo Wen ,Hao Tian ,Y Zheng ,Jun Yan ,Yi Fang Wang ,Z Mao ,Y T Liang ,Fei Peng Ning ,Yuan Gao ,Ji Ke Wang ,Xue Yao Zhang ,Chang Chun Zhang ,S Sun ,Z Y Deng ,T Luo ,S Han ,Xiao Hu Mo ,L H Wu ,Jian Yong Zhang ,Y Mao ,Chang Zheng Yuan ,Wen Bo Song ,Wei Dong Li ,X X Cao ,Q W Lü ,X Sun ,Y S Zhu ,Shen Jian Chen ,Jia Zou

doi:10.1088/1674-1137/33/6/005

Decay vertex reconstruction and 3-dimensional lifetime determination at BESIII

Xu Min, Zhang Lei + Show 59 more

https://doi.org/10.1088/1674-1137/33/6/005

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Journal: Chinese Physics C	Publication Date: Jun 1, 2009
Citations: 40

Affiliation: University of Science and Technology of China, Institute of High Energy Physics, Nanjing University, University of Chinese Academy of Sciences, Guangxi University, Shandong University, Henan Normal University, Zhengzhou University, Peking University, Shanxi University, Tsinghua University, Nanjing Normal University

#Decay Vertex #Vertex Reconstruction + Show 8 more

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Abstract

This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as K0S, 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.

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