Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Sterile Neutrino and Dipole Portal Explanations of the MiniBooNE Excess

Jul 8, 2022, 7:05 PM
1h 25m
Bologna, Italy

Bologna, Italy

Palazzo della Cultura e dei Congressi
Poster Neutrino Physics Poster Session


Nicholas Kamp (MIT)


This talk discusses recent developments concerning the MiniBooNE anomaly—an excess of low energy electronlike events in Fermilab's Booster Neutrino Beam. The latest results from the MicroBooNE collaboration disfavor an enhancement of low-energy electron neutrino interactions as the entire source of the MiniBooNE excess. However, a joint fit by the MiniBooNE collaboration, presented here, suggests that there are still regions of sterile neutrino parameter space consistent with both experiments. Similar conclusions have been reached by other studies. That being said, the vanilla 3+1 sterile neutrino model is unable to explain the MiniBooNE excess at the lowest energies and scattering angles. This motivates the consideration of more exotic models that can explain the entirety of the excess. In this talk, we explore a model introducing a MeV-scale dipole-coupled neutral lepton alongside the typical eV-scale mixing-coupled sterile neutrino. The preferred regions of dipole parameter space with respect to the MiniBooNE excess are discussed, as well as constraints from existing MINERvA results.

In-person participation Yes

Primary authors


Mr Alejandro Diaz (MIT) Mr Stefano Vergani (Cambridge) Prof. Carlos Argüelles-Delgado (Harvard University) Prof. Janet Conrad (MIT) Dr Matheus Hostert (Perimeter Institute ) Prof. Michael Shaevitz (Columbia University) Prof. Melissa Uchida (Cambridge)

Presentation materials