Lagrange multiplier method used in BESIII kinematic fitting

Liang Yan, Rang Lin He, Wei Guo Li, Jian Ming Bian, Cheng Dong Fu, Bin Huang, Ying Liu, Qi Wen Lü, Fei Peng Ning, Sheng Sen Sun, Min Xu, Jian Yong Zhang, Yong Sheng Zhu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In this paper, the kinematic fitting with the Lagrange multiplier method has been studied for BESIII experiment. First we introduce the Lagrange multiplier method and implement kinematic constraints. Then we present the performance of the kinematic fitting algorithm. With the kinematic fitting, we can improve the resolution of track parameters and reduce the background.

Original languageEnglish (US)
Pages (from-to)204-209
Number of pages6
JournalChinese Physics C
Issue number2
StatePublished - 2010


  • Kinematic fitting
  • Lagrange multiplier


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