Single Photon Search in MicroBooNE Using Wire-Cell 3D Reconstruction Algorithms

The MicroBooNE experiment is an 85 ton active volume liquid argon time projection chamber in the Booster Neutrino Beam at Fermilab. MicroBooNE was designed to investigate the low energy excess of electromagnetic events observed by the MiniBooNE experiment. Recent MicroBooNE results disfavor an electron neutrino hypothesis for this excess, leaving neutrino events which produce a single photon as one of the most compelling explanations for the anomaly. MicroBooNE has investigated single photons using Pandora reconstruction, and has disfavored a large excess of neutral current delta radiative decays, primarily by examining events with one photon and one proton. In this talk, I will describe progress towards a new single photon investigation in MicroBooNE using Wire-Cell 3D reconstruction algorithms, which will make a largely independent second measurement of neutral current delta radiative decays. This new analysis will also allow a closer look into events with a single photon shower and no hadronic activity, a topology which has particularly challenging backgrounds, and which is predicted by a variety of beyond-the-standard-model theories.