Reappraisal of SU(3)-flavor breaking in B→DP

Abstract

In light of recently found deviations of the experimental data from predictions from QCD factorization for B(s)→D(s)P decays, where P={π,K}, we systematically probe the current status of the SU(3)F expansion from a fit to experimental branching ratio data without any further theory input. We find that the current data are in agreement with the power counting of the SU(3)F expansion. While the SU(3)F limit is excluded at >5σ, amplitude-level SU(3)F-breaking contributions of ∼20% suffice for an excellent description of the data. SU(3)F breaking is needed in tree (>5σ) and color-suppressed tree (2.4σ) diagrams. We are not yet sensitive to SU(3)F breaking in exchange diagrams. From the underlying SU(3)F parametrization we predict the unmeasured branching ratios B(B¯s0→π−D+)=2B(B¯s0→π0D0)=[0.3,7.2]×10−6 of suppressed decays that can be searched for at the LHCb experiment. Published by the American Physical Society 2024