AI 中文总结
该研究利用DELPHI开放数据，通过特定算法重建喷注，测量Z玻色子衰变能量排序喷注中Ξ⁻/Ξ⁺的产生率、动量谱及相关比率，首次实现此测量，结果与预期及其他结果相符。
AI 中文摘要
喷注中Ξ⁻/Ξ⁺重子产生可探测非微扰量子色动力学（QCD）过程中的双奇异数产生和重子形成。本研究使用1992年至1995年DELPHI开放数据中的320万个Z→强子事件，测量能量排序喷注中Ξ⁻/Ξ⁺的产生率和动量谱。用Durham算法重建喷注，通过三喷注事件中喷注的能量排序获得富含夸克和胶子的喷注样本。测量了能量排序喷注中Ξ⁻/Ξ⁺的平均产生情况，并得出胶子和夸克喷注中Ξ⁻/Ξ⁺产生率相对于平均带电粒子多重性的比率。结果与JETSET预期以及OPAL关于R⁽K_S⁰⁾_g/q和R⁽Λ⁾_g/q的结果在不确定性范围内一致。本研究首次测量了Z玻色子衰变能量排序喷注中Ξ⁻/Ξ⁺的产生。
英文摘要
The production rates of $Ξ^{-}/\barΞ^{+}$ baryons in energy-ranked jets produced in $Z\to\text{hadrons}$ decays are measured using $3.2$ million hadronic $Z$ events recorded by the DELPHI experiment. Jets are reconstructed using the Durham algorithm with $y_{\text{cut}}=0.005$. Quark- and gluon-enriched jet samples are obtained by ranking the jet energies in three-jet events. The softest jet are found to produce fewer $Ξ^{-}/\barΞ^{+}$ and less energetic baryons than the other jets. The ratio of $Ξ^{-}/\barΞ^{+}$ production rates in gluon and quark jets, each normalized to the corresponding mean charged-particle multiplicity, is measured to be $1.21 \pm 0.18~\mathrm{(stat.)} \pm 0.26~\mathrm{(syst.)}$. The result is consistent with the JETSET expectation and the OPAL measurements of $K_S^0$ and $Λ$ productions in $Z$ decays. This study presents the first measurement of the gluon-to-quark production ratio for baryons containing two $s$ quarks, providing new insights into strange-quark production and hadronization. Future $e^{+}e^{-}$ colliders such as CEPC and FCCee will provide much larger $Z$-boson samples and will allow far more precise studies of the subject.
