2025/05/11 by Hai-Yang Cheng, Fanrong Xu, Cheng, Hai-Yang +3 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2505.07150
openalex publication_date 2025/05/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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: Λc+ → p π0,~Λc+ → p η', ~Ξc0 → Σ0η and Ξc+ → Σ+ η. CP asymmetries in the last three modes receive sizable contributions from the SU(3)-flavor-singlet hairpin diagram.