标题： $Λp$在CLAS探测器中的弹性散射 显示英文标题

标题： $Λp$ Elastic Scattering in the CLAS Detector

摘要： 弹性散射过程 $\Lambda p\to\Lambda p$ 为核物理中的多个问题提供了见解。 $\mathrm{SU}(3)_F$ 对称性意味着 $\Lambda p$ 和 $pp$ 散射截面之间有密切的一致性。 弹性散射截面 $\Lambda p$ 也可以揭示中子星的结构。 启动了一个数据挖掘项目，使用了为其他目的采集的多个CLAS数据集，这些数据集是用光子束在长液氢靶上获取的。 在如 $\gamma p\to K^+\Lambda$ 这样的过程中产生的 $\Lambda$ 可以在衰变或离开靶前与靶内的第二个质子发生相互作用。 CLAS具有良好的角度接受度和动量分辨率，使其非常适合此类分析，尽管它并非为此类测量而设计。 散射的$\Lambda$可以从$\pi^-p$不变质量中识别出来。 初始$\Lambda$的四矢量在过程$Xp\to\Lambda p$中被重建，这在$\Lambda$质量处显示出一个强烈的峰，事件数大约是现有世界数据样本的两倍。 这一观测结果为使用短寿命粒子的次级束进行其他测量提供了可能性。 本文将讨论分析的当前状态，以及我们对此项目的未来工作计划。 显示英文摘要

摘要： The elastic scattering process $\Lambda p\to\Lambda p$ offers insights on multiple problems in nuclear physics. $\mathrm{SU}(3)_F$ symmetry implies a close agreement between the $\Lambda p$ and $pp$ scattering cross sections. The $\Lambda p$ elastic scattering cross section can also illuminate the structure of neutron stars. A data-mining project was started using multiple CLAS data sets taken for other purposes with photon beams on a long liquid hydrogen target. A $\Lambda$ produced in a process such as $\gamma p\to K^+\Lambda$ can interact with a second proton inside the target before either decaying or leaving the target. The good angular acceptance and momentum resolution of CLAS make it well-suited for this type of analysis, even though it was not designed for such a measurement. The scattered $\Lambda$ can be identified from the $\pi^-p$ invariant mass. The four-vector of the initial $\Lambda$ is then reconstructed in the process $Xp\to\Lambda p$, which shows a strong peak at the $\Lambda$ mass with roughly twice the number of events as the existing world data sample. This observation opens up the possibility of other measurements using secondary beams of short-lived particles. This paper will discuss the current status of the analysis, and our plans for future work on this project.