Title: Search for Light Sterile Neutrinos with Two Neutrino Beams at MicroBooNE

Abstract: The Standard Model of particle physics predicts only three flavors of neutrinos: νe, νµ and ντ. However, anomalous measurements from the Liquid Scintillator Neutrino Detector (LSND) and Mini-Booster Neutrino Experiment (MiniBooNE), as well as from Gallium experiments, could all be explained by the existence of a fourth neutrino flavor. This neutrino would not interact weakly and thus is described as a "sterile" neutrino.

We use data collected in the MicroBooNE Liquid Argon Time Projection Chamber (LArTPC) to exclude the single-sterile-neutrino interpretation of the MiniBooNE and LSND anomalies at the 95% confidence level and rule out a notable portion of the parameter space that could explain the Gallium anomaly. This measurement is facilitated by the use of two neutrino beams withdifferent intrinsic νe fractions, breaking the degeneracy between νµ → νe appearance and νe → νe disappearance. Furthermore, the LArTPC detector technology enables a high-purity, high-efficiency inclusive νe charged current selection through its sub-cm level position reconstruction and MeV-scale energy reconstruction. We find no evidence for nonstandard neutrino oscillations from measurements of νµ → νe flavor transition and νe disappearance