Beyond Standard Model Searches in the MiniBooNE Experiment

TL;DR

The MiniBooNE experiment has explored beyond standard model physics through neutrino oscillation anomalies, Lorentz violation tests, and dark sector searches, providing key limits and evidence that motivate future investigations.

Contribution

This paper reviews MiniBooNE's contributions to beyond standard model physics, including neutrino anomalies, Lorentz violation limits, and dark sector particle searches.

Findings

Observed excesses of electron neutrino and antineutrino events.

Set limits on Lorentz violation parameters.

Conducted new beam-dump mode search for dark sector particles.

Abstract

The MiniBooNE Experiment has contributed substantially to beyond standard model searches in the neutrino sector. The experiment was originally designed to test the $\Delta m^2$~1 eV$^2$ region of the sterile neutrino hypothesis by observing $\nu_e$ ($\bar\nu_e$) charged current quasi-elastic signals from a $\nu_\mu$ ($\bar\nu_\mu$) beam. MiniBooNE observed excesses of $\nu_e$ and $\bar\nu_e$-candidate events in neutrino and anti-neutrino mode, respectively. To date, these excesses have not been explained within the neutrino Standard Model ($\nu$SM), the Standard Model extended for three massive neutrinos. Confirmation is required by future experiments such as MicroBooNE. MiniBooNE also provided an opportunity for precision studies of Lorentz violation. The results set strict limits for the first time on several parameters of the Standard Model-Extension, the generic formalism for considering Lorentz violation. Most recently, an extension to MiniBooNE running, with a beam tuned in beam-dump mode, is being performed to search for dark sector particles. This review describes these studies, demonstrating that short baseline neutrino experiments are rich environments in new physics searches.