Abstract
A recent update from MiniBooNE has strengthened the observed 4.8σ 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)′ 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 ≳2σ 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.
Highlights
The discovery of neutrino oscillations [1,2,3], and of neutrino masses and mixing, implies that the Standard Model (SM) of particle physics is incomplete
We propose that the MiniBooNE excess arises from the decay products of Heavy neutral leptons (HNL) produced in νμ upscattering inside the detector, νμ + H → (N6,5 → N4 + e+ + e−) + H, (6)
Let us remark that our benchmark points (BPs) satisfy all existing experimental constraints, including decay-in-flight bounds from PS-191 [96, 105]
Summary
The discovery of neutrino oscillations [1,2,3], and of neutrino masses and mixing, implies that the Standard Model (SM) of particle physics is incomplete. Have unique features, requiring the reevaluation of existing bounds and offering new signatures, especially in the presence of multiple portals to the SM [41] Such an extension of the SM would leave imprints, not just in neutrino experiments, and in e.g. dark photon and dark scalar searches. We point out some less-often discussed anomalies in existing data which are compatible with the predictions of our model These include a mild excess of monophoton events at. BaBar [44], the anomalous νe -appearance observed by past accelerator experiments, such as PS-191 [45] and E-816 [46], and the double neutral vertex events in CCFR [47,48] We show how these results emerge within a coherent picture and that they are, highly correlated when interpreted under our hypothesis.
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