$\bar{B}_{(s)}^0 \to D^{(\ast)+}_{(s)} \lbrace π^-, K^- \rbrace$衰变中的一个新谜题对新物理学的启示
Implications for new physics from a novel puzzle in $\bar{B}_{(s)}^0 \to D^{(\ast)+}_{(s)} \lbrace π^-, K^- \rbrace$ decays
摘要：
最近，基于QCD因子分解方法，对$B$ -介子强子衰变的标准模型预言$\bar{B}^0 \to D^{(\ast)+}K^-$和$\bar{B}^0_s \to D^{(\ast)+}_s π^-$进行了更新。这一改进揭示了$B$ -介子强子衰变中的一个新难题：在数据和预测的分支比之间存在温和但普遍的紧张关系。假设高阶QCD修正不足以解决张力，我们研究了这个难题的几个新的物理解释。我们发现这种张力可以用左手$W^\prime$模型来部分解释，该模型可以与其他味观测量和对撞机边界相兼容。
英文摘要：
Recently, the standard model predictions for the $B$-meson hadronic decays, $\bar{B}^0 \to D^{(\ast)+}K^-$ and $\bar{B}^0_s \to D^{(\ast)+}_s π^-$, 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 $W^\prime$ model, which can be compatible with other flavor observables and collider bounds.
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