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Belle II has reported the first evidence for $B^+ \to K^+\nu\bar\nu$ with abranching ratio $2.7 \sigma$ higher than the standard model expectation. Weexplain this, and the MiniBooNE and muon anomalous magnetic moment anomalies ina model with a dark scalar that couples to a slightly heavier sterile Diracneutrino and that communicates with the visible sector via a Higgs portal. Wemake predictions for rare kaon and other $B$ meson decays.

$B \to K \nu\bar\nu$, MiniBooNE and muon $g-2$ anomalies from a dark sector