2025/06/23 by Yang, Chang, He, Xiao-Gang, Liu, Chia-Wei · 2 citations
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2506.19005
We present a comprehensive study of anti-triplet charmed baryon decays into octet baryons and pseudoscalar mesons using the SU(3)F flavor symmetry framework. By decomposing the flavor structure, all decay amplitudes are parametrized with a minimal set of irreducible amplitudes, and the Körner-Pati-Woo theorem further reduces the number of independent parameters from the original 35 to 19 under exact symmetry when small terms proportional to λb = Vcb^*Vub are neglected. The independent number becomes 27 with leading SU(3)F breaking effects. A global fit to 51 experimental measurements yields a χ2/d.o.f. of 2.36 and provides precise values for the decay amplitudes. Notable discrepancies are observed in the fitted branching fractions of Ξc0 → Ξ- π+ and Ξc+ → Ξ- π+ π+, which exceed current measurements by more than 2σ. Incorporating final-state rescattering effects to recover the main effects of terms proportional to λb, we predict enhanced CP violation, with ACP reaching up to 10-3 in golden channels such as Ξc0 → p K- and Ξc0 → Σ+ π-. Our analysis also finds that the branching ratio for Ξc+ → Λπ+ is enhanced to (9.7 ± 1.2) × 10-4 due to significant cancellations.