Decay vertex reconstruction and 3-dimensional lifetime determination at BES

O4; This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as KSO, 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...

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Published in:中国物理C（英文版） 2009, Vol.33 (6), p.428-435
Main Authors: XU Min, HE Kang-Lin, ZHANG Zi-Ping, WANG Yi-Fang, BIAN Jian-Ming, CAO Guo-Fu, CAO Xue-Xiang, CHEN Shen-Jian, DENG Zi-Yan, FU Cheng-Dong, GAO Yuan-Ning, HAN Lei, NAN Shao-Qing, HE Miao, HU Ji-Feng, HU Xiao-Wei, HUANG Bin, HUANG Xing-Tao, JIA Lu-Kui, JI Xiao-Sin, LI Hai-Bo, LI Wei-Dong, LIANG Yu-Wie, LIU Chun-Xiu, LIU Huai-Min, LIU Ying, LIU Yong, LUO Tao, L(U) Qi-Wen, MA Qiu-Mei, MA Xiang, MAO Ya-Jun, MAO Ze-Pu, MO Xiao-Hu, NING Fei-Peng, PING Rong-Gang, QIU Jin-Fa, SONG Wen-Bo, SUN Sheng-Sen, SUN Xiao-Dong, SUN Yong-Zhao, TIAN Hao-Lai, WANG Ji-Ke, WANG Liang-Liang, WEN Shuo-Pin, WU Ling-Hui, WU Zhi, XIE Yu-Guang, YAN Jie, YAN Liang, YAO Jian, YUAN Chang-Zheng, YUAN Ye, ZHANG Chang-Chun, ZHANG Jian-Yong, ZHANG Lei, ZHANG Xue-Yao, ZHANG Yao, ZHENG Yang-Heng, ZHU Yong-Sheng, ZOU Jia-Heng
Format: Article
Language:English
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Summary:O4; This paper focuses mainly on the vertex reconstruction of resonance particles with a relatively long lifetime such as KSO, 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.
ISSN:1674-1137