$B \to K^*(\to Kπ) \ell^+\ell^-$理论和全球图景：下一步是什么？
$B \to K^*(\to Kπ) \ell^+\ell^-$ theory and the global picture: What's next?
摘要：
本文讨论了半轻子$b\to s\ell^+\ell^-$衰变中LHC异常的现状，特别着重讨论了唯一的四体角分布$B \to K^*(\to Kπ)\ell^+\ell^-$。强子不确定性在这种模式的治疗进行了简要回顾，并在文献中的一些分析进行了批判性的重新评估。由全局拟合提供的全局图像指向对于不同的新物理学场景显著性基本上高于4 $σ$的一致的偏差模式。最后，我们建议作为该领域的下一步，重点研究优化的观测值，比较电子和μ子模式，轻子味普适性违反敏感，并从强子不确定性（包括魅力）的SM，所谓的$Q_i$观测值。
英文摘要：
The present status of the LHC anomalies found in exclusive semileptonic $b\to s\ell^+\ell^-$ decays is discussed with special emphasis on the exclusive 4-body angular distribution $B \to K^*(\to Kπ)\ell^+\ell^-$. The treatment of hadronic uncertainties in this mode is briefly reviewed, and some of the analyses in the literature are critically reassessed. The global picture provided by the global fit points to a coherent pattern of deviations with a significance substantially above 4$σ$ for different New Physics scenarios. Finally, we propose as the next step in the field to focus on the study of optimized observables that compare electron and muon modes, sensitive to lepton-flavour universality violations and free from hadronic uncertainties (including charm) in the SM, the so called $Q_i$ observables.
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