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Belle II has reported the first evidence for B+→K+νν¯ with a branching ratio 2.7σ higher than the standard model expectation. We explain this, and the MiniBooNE and muon anomalous magnetic moment anomalies in a model with a dark scalar that couples to a slightly heavier sterile Dirac neutrino and that communicates with the visible sector via a Higgs portal. We make predictions for rare kaon and other B meson decays.
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A<sc>bstract</sc> We study flavor changing neutral current decays ofBandKmesons in the dark U(1)Dmodel, with the dark photon/darkZmass between 10 MeV and 2 GeV. Although the model provides an improved fit (compared to the standard model) to the differential decay distributions ofB → K(∗)ℓ+ℓ−, withℓ=μ,e, andBs→ ϕμ+μ−, the allowed parameter space is ruled out by measurements of atomic parity violation,K+→ μ++invisibledecay, and$$ {B}_s-{\overline{B}}_s $$ mixing, among others. To evade constraints from low energy data, we extend the model to allow for (1) additional invisibleZDdecay, (2) a direct vector coupling ofZDto muons, and (3) a direct coupling ofZDto both muons and electrons, with the electron coupling fine-tuned to cancel theZDcoupling to electrons via mixing. We find that only the latter case survives all constraints.more » « less
