Caro Terrazas, Ivan, authorMooney, Michael R., advisorWilson, Robert J., committee memberBuchanan, Norm, committee memberKirby, Michael, committee member2023-01-212023-01-212022https://hdl.handle.net/10217/236037MicroBooNE is a liquid argon time projection chamber detector designed to address the excess of low-energy electromagnetic events observed by the MiniBooNE detector. Electron neutrinos can create a wide variety of topologies when interacting with liquid argon; this analysis measures events without pions, both with (1eNp0π) and without (1e0p0π) visible protons. This thesis presents a first measurement of pionless charged-current electron neutrino interactions from the Booster Neutrino Beam at Fermilab in the MicroBooNE detector. A model based on the MiniBooNE result is used to quantify the strength of the electron neutrino excess. The analysis suggests that if an excess is present, it is not consistent with a simple scaling of the electronneutrino contribution to the flux. Combined, the 1eNp0π and 1e0p0π channels do not give a conclusive indication of the tested model, but separately they both disfavor the low-energy excess model at > 90% CL. The observation in the most sensitive 1eNp0π channel is below the prediction and is consistent with no excess. In the less sensitive 1e0p0π channel the observation at low energy is above the prediction, while overall there is agreement over the full energy spectrum.born digitaldoctoral dissertationsengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.low-energy excessneutrinoMicroBooNELArTPCText