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

TL;DR

This paper proposes a dark sector model involving a dark scalar and sterile neutrino to explain anomalies observed in B meson decays, MiniBooNE, and muon g-2, and makes predictions for related rare decays.

Contribution

It introduces a novel dark sector model linking multiple anomalies and provides testable predictions for rare meson decays.

Findings

Explains the excess in $B^+ o K^+ uar u$ decays.

Accounts for MiniBooNE and muon g-2 anomalies.

Predicts new rare decay channels for future experiments.

Abstract

Belle II has reported the first evidence for $B^+ \to K^+\nu\bar\nu$ with a branching ratio $2.7 \sigma$ 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.