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Syuhei Iguro, Teppei Kitahara
Abstract
Recently, the standard model predictions for the $B$-meson hadronic decays, ${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{(*)+}{K}^{\ensuremath{-}}$ and ${\overline{B}}_{s}^{0}\ensuremath{\rightarrow}{D}_{s}^{(*)+}{\ensuremath{\pi}}^{\ensuremath{-}}$, have been updated based on the QCD factorization approach. This improvement sheds light on a novel puzzle in the $B$-meson hadronic decays: there are mild but universal tensions between data and the predicted branching ratios. Assuming the higher-order QCD corrections are not huge enough to solve the tension, we examine several new physics interpretations of this puzzle. We find that the tension can be partially explained by a left-handed ${W}^{\ensuremath{'}}$ model, which can be compatible with other flavor observables and collider bounds.