Dipole-Coupled Neutrissimo Explanations of the MiniBooNE Excess Including Constraints from MINERvA Data

Understand

We revisit models of heavy neutral leptons (neutrissimos) with transition magnetic moments as explanations of the $4.8\sigma$ excess of electron-like events at MiniBooNE.

• We perform a detailed Monte Carlo-based analysis to re-examine the preferred regions in the model parameter space to explain MiniBooNE, considering also potential contributions from oscillations due to an eV-scale sterile neutrino.
• We then derive robust constraints on the model using neutrino-electron elastic scattering data from MINERvA.
• We find that MINERvA rules out a large region of parameter space, but allowed solutions exist at the $2\sigma$ confidence level.