Searches for Coherent Single-photon Production and BSM e⁺e^- Production with MicroBooNE’s Pandora-based Single-Photon Search

MicroBooNE is an 85 ton active volume liquid argon time projection chamber with excellent spatial and calorimetric resolution, whose primary physics goals include the investigation of the MiniBooNE low-energy excess. Recent MicroBooNE results, using two exclusive final state selections of 1 photon and 1 proton and of 1 photon and no other visible final state activity, have disfavored the possibility of an excess in the neutral current Delta radiative decay channel at Booster Neutrino Beam energies—one of the dominant single-photon backgrounds in the MiniBooNE measurement in need of a direct constraint. MicroBooNE's result is driven primarily by the 1 photon and 1 proton selection, which leverages kinematics for significant background reduction. This talk examines the 1 photon and no other visible final state activity selection more closely, where additional background reduction enables searches for other rare “single-photon” processes, such as neutral current coherent single-photon production or beyond-Standard Model physics which predict boosted e⁺e^- production.