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Whether hard-to-compute strong-force effects explain this is disputed.","posed_since":"2013","precise":"Branching ratios of $B \\to K \\mu \\mu$ and $B_{s} \\to \\phi \\mu \\mu$ at low $q^{2}$ and the angular observable $P5'$ in $B \\to K* \\mu \\mu$ deviate from SM predictions by about $2 \\text{ to } 4 \\sigma$, while $R_{K}$ and $R_{K}*$ agree with the SM (LHCb, 2022). Identify whether a shift in the Wilson coefficient $C_{9}$ is short-distance new physics or long-distance c-cbar loops.","problem_ref":"8fd8a581feb0ef4e19d70aede78e9bb1986cf0a15aeb06daea9b01d09f18ec03","references":"","settled_by":"Data-driven determination of the $q^{2}$ dependence of non-local charm contributions from LHCb Run 3 and Belle II, combined with lattice form factors.","status_note":"","title":"Are $b \\text{ to } s \\mu \\mu$ tensions new physics or charm-loop 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