CORRESPONDENCE ANALYSIS WITH DOUBLING FOR TWO-MODE VALUED NETWORKS

We report measurements of the ratios of branching fractions R⁡(D⁽*⁾⁺)=B(¯B0→D⁽*⁾⁺⁢t⁻¯vₜ)/B⁡(¯B0→D⁽*⁾⁺⁢l⁻⁢¯vₗ), where l denotes either an electron or a muon. These ratios test the universality of the charged-current weak interaction. The results are based on a 365 fb⁻¹ data sample collected with the Belle II detector at the SuperKEKB e⁺e⁻ collider, which operates at a center-of-mass energy corresponding to the (Formula presented) resonance, just above the threshold for BB̄ production. Signal candidates are reconstructed by selecting events in which the companion B meson from the (Formula presented) decay is identified in semileptonic modes. The τ lepton is reconstructed via its leptonic decays. We obtain R⁡(D⁺)=0.418+0.075−0.073⁢(stat)+0.049−0.056⁢(syst) and R(D*⁺)=0.306+0.035−0.033⁢(stat)+0.016−0.018⁢(syst), which are consistent with world average values. Accounting for the correlation between them, these values differ from the Standard Model expectation by a collective significance of 1.7 standard deviations.