Low Energy Excess and New Physics Searches with MicroBooNE

First Full Dataset Search for a 𝜈 e Low Energy ExcessFor the first time, the full set of 1.11⨉10 21 POT is used to search for the low-energy excess (LEE) observed in MiniBooNE.This search tests whether the excess is due to an increase in the number of electron neutrinos.Two models are tested: one that models the excess as a function of the neutrino energy and one that preserves the distribution of the shower kinematics in MiniBooNE.Results using the first 6.86⨉10 20 POT of this dataset were published in [1] . Single Photon Searches Dark-Sector e + e -SolutionsSignal selections binned in reconstructed neutrino energy.The MiniBooNE LEE signal is unfolded from the CCQE electron neutrino energy. Signal selections binned in reconstructed shower energy and cos(θ). The MiniBooNE LEE signal is unfolded from the shower energy and angle distributions. MicroBooNE Public Note 1127Previous results showed no excess of NC Δ→N events with protons.This expanded analysis will have more sensitivity to NC Δ→N events with no protons, compared to [4] . MicroBooNE Public Note 1126 MiniBooNEPhys.Rev. D 103, 052002 (2021