A Dark Seesaw Solution to Low Energy Anomalies: MiniBooNE, the muon $(g-2)$, and BaBar

TL;DR

This paper proposes a dark neutrino sector model with a dark gauge symmetry to explain multiple low energy anomalies, including MiniBooNE excess, muon g-2, and BaBar monophoton excess, by connecting collider and neutrino physics.

Contribution

It introduces a renormalizable dark neutrino model with a broken U(1)' gauge symmetry that simultaneously addresses several experimental anomalies and predicts observable collider signatures.

Findings

Explains MiniBooNE e-like excess with dark neutrinos.

Accounts for muon g-2 deviation via new interactions.

Predicts heavy neutral lepton production at colliders.

Abstract

A recent update from MiniBooNE has strengthened the observed $4.8\sigma$ excess of $e$-like events. Motivated by this and other notable deviations from standard model predictions, such as the muon $(g-2)$, we propose a solution to low energy anomalies through a dark neutrino sector. The model is renormalizable and can also explain light neutrino masses with an anomaly-free and dark $U(1)^\prime$ gauge symmetry broken at the GeV scale. Large kinetic mixing leads to s-channel production of heavy neutral leptons at $e^+e^-$ colliders, where we point out and explain a $\gtrsim 2\sigma$ excess observed in the BaBar monophoton data. Our model is also compatible with anomalous $e$-like events seen at old accelerator experiments, as well as with an excess of double vertex signatures observed at CCFR.