论文标题
与熊猫探测器的激发$ξ$ baryons的研究
Study of Excited $Ξ$ Baryons with the PANDA Detector
论文作者
论文摘要
BARYON激发光谱的研究提供了对重子的内部结构的见解。到目前为止，大多数全球努力都针对$ n^*$和$δ$光谱。然而，对双重和三重奇怪的重子光谱的研究为$ n^*$和$δ$ spectra提供了独立的信息。未来的反蛋白实验熊猫将直接访问包含$ \barξ$对的最终状态，对于$ \ bar {p} p $ reactions的生产横截面预计最高$μ$ b。在实验的第一阶段中，$ l = 10^{31} \，cm^{ - 2} s^{ - 1} $的发光度，预期的横截面对应于$ \ sim 10^6 $ events $/$ day的生产率。因此，随着近4π$检测器的接受，熊猫将是一家超子工厂。在这项研究中，$ \ bar {p} p \ rightArrow \ bar配给\ bar耳^+ξ^{* - } $以及$ \ bar {p} p \ rightArrow \bardξ^{*+}之一，与各种decay模式进行了研究。对于信号事件的独家重建，使用了完整的衰减树拟合，从而在$ 3 \，\％$和$ 5 \，\％$之间产生重建效率。这允许在数据获取的几周内收集高统计数据。
The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards $N^*$ and $Δ$ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the $N^*$ and $Δ$ spectra. The future antiproton experiment PANDA will provide direct access to final states containing a $\barΞΞ$ pair, for which production cross sections up to $μ$b are expected in $\bar{p}p$ reactions. With a luminosity of $L=10^{31}\,cm^{-2}s^{-1}$ in the first phase of the experiment, the expected cross sections correspond to a production rate of $\sim 10^6$ events$/$day. With a nearly $4π$ detector acceptance, PANDA will thus be a hyperon factory. In this study, reactions of the type $\bar{p}p\rightarrow \barΞ^+ Ξ^{*-}$ as well as $\bar{p}p\rightarrow \barΞ^{*+} Ξ^{-}$ with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between $3\,\%$ and $5\,\%$. This allows high statistics data to be collected within a few weeks of data taking.
