标题： 顶夸克图解方法中粲强子衰变中的CP破坏 显示英文标题

标题： CP Violation in Hadronic Weak Decays of Charmed Baryons in the Topological Diagrammatic Approach

摘要： D衰变中的CP破坏通常预计非常小，约为$10^{-4}$或更小。 然而，可以通过最终态再散射诱导出较大的长程企鹅拓扑。 在强子水平上，它们表现为三角形和气泡图。 然而，这些图不仅包含企鹅图还包含其他树图拓扑。 因此，我们关注这些图的味结构，并提取它们对企鹅图和树图拓扑的贡献。 分析是在拓扑图方法和不可约SU(3)方法的框架内进行的，在该框架中实现了QCD的SU(3)味对称性来描述粲重子的非轻子衰变。 在千分之一量级的CP破坏在以下衰变模式中被发现：$\Lambda_c^+ \to p \pi^0,~\Lambda_c^+ \to p \eta', ~\Xi_c^0 \to \Sigma^0\eta$和$\Xi_c^+ \to \Sigma^+ \eta$。 最后三种模式中的CP不对称度受到SU(3)-味单态帽图的显著贡献。 显示英文摘要

摘要： CP violation in the charmed baryon sector is generally expected to be very small, of order $10^{-4}$ or even smaller. Nevertheless, large long-distance penguin topologies can be induced through final-state rescattering. At the hadron level, they are manifested as the triangle and bubble diagrams. However, these diagrams consist of not only the penguin but also other tree topologies. Therefore, we focus on the flavor structure of the these diagrams and project out their contributions to penguin and tree topologies. The analysis is performed within the framework of the topological diagram approach and the irreducible SU(3) approach in which the SU(3) flavor symmetry of QCD is realized to describe the nonleptonic decays of charmed baryons. CP violation at the per mille level is found in the following decay modes: $\Lambda_c^+ \to p \pi^0,~\Lambda_c^+ \to p \eta', ~\Xi_c^0 \to \Sigma^0\eta$ and $\Xi_c^+ \to \Sigma^+ \eta$. CP asymmetries in the last three modes receive sizable contributions from the SU(3)-flavor-singlet hairpin diagram.