I 英文摘要 BESIII 实验上ψ(2S) →Ξ(1530)Ξ̅(1530)精确测量 Abstract The decays of ψ(2S) →Ξ(1530)Ξ̅(1530) have been studied using the 106×106 ψ(2S) events collected on BESIII experiment. The decays ψ(2S) →Ξ 0(1530)Ξ̅ 0(1530) and ψ(2S) →Ξ-(1530)Ξ̅+(1530) are observed for the first time in the world. The branching fraction ratio of ψ(2S) →Ξ 0(1530)Ξ̅ 0(1530) is measured to be (±(stat.)± (sys.))×10-5. The branching fraction ratio of ψ(2S) →Ξ-(1530)Ξ̅+(1530) is measured to be ( ± (stat.)) × 10-5. The measurements provide important experimental information to test the QCD theory. The BESI and CLEO collaborations have investigated the decay ψ(2S) →Ξ0(1530)Ξ̅0(1530), but no signal events are observed and the upper limit ×10-5 is determined. In our measurements, the statistical significance of the signal is larger than 9σ. The charged decay ψ(2S) →Ξ-(1530)Ξ̅+(1530) is observed for the first time in the world and its branching fraction ratio is measured precisely.
Written by Wei Chenyang Supervised by Xu Xinping Wang Zhiyong Xu Guofa
II 目录 中文摘要................................................................................................................................ I Abstract ................