$Σ^{+}(1385)$电磁衰变的分支比
Branching Ratio of the Electromagnetic Decay of the $Σ^{+}(1385)$
摘要：
CLAS探测器被用来获得有史以来第一次测量的电磁衰变的$Σ^{*+}(1385)$从反应$γp \to K^0 Σ^{*+}(1385)$。最大能量为3.8 GeV的实光子束入射到液氢靶上，产生了K介子和$Σ^*$超子.运动学拟合用于将反应通道与背景过程分离。拟合算法为CLAS探测器中子的运动学拟合提供了一种新的方法，实现了$250.0\pm56.9(stat)^{+34.3}_{-41.2}(sys)$ keV的部分宽度测量。利用SU（3）味多重态表示的U自旋对称性检验得到了与实验测量一致的$Σ^{*+}(1385)\toΣ^{+}γ$和$Σ^{*0}(1385)\toΛγ$部分宽度的预测。
英文摘要：
The CLAS detector was used to obtain the first ever measurement of the electromagnetic decay of the $Σ^{*+}(1385)$ from the reaction $γp \to K^0 Σ^{*+}(1385)$. A real photon beam with a maximum energy of 3.8 GeV was incident on a liquid-hydrogen target, resulting in the photoproduction of the kaon and $Σ^*$ hyperon. Kinematic fitting was used to separate the reaction channel from the background processes. The fitting algorithm exploited a new method to kinematically fit neutrons in the CLAS detector, leading to the partial width measurement of $250.0\pm56.9(stat)^{+34.3}_{-41.2}(sys)$ keV. A U-spin symmetry test using the SU(3) flavor-multiplet representation yields predictions for the $Σ^{*+}(1385)\toΣ^{+}γ$ and $Σ^{*0}(1385)\toΛγ$ partial widths that agree with the experimental measurements.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
