Electron Neutrino Event Selection at the DUNE Near Detector

This work will present a method for electron neutrino event selection at the DUNE Near Detector. Constraining the electron neutrino to muon neutrino cross section ratio will be an important part of the DUNE neutrino electron neutrino appearance analysis. The Deep Underground Neutrino Experiment (DUNE) will consist of a Near Detector (ND) near the muon neutrino beam source and a Far Detector (FD) 1300 km away. Both detector complexes will include liquid argon time-projection chambers (LArTPC). The ND complex will consist of a 67t fiducial mass of 35 separate modular ArgonCube LArTPCs arranged in a 5 x 7 x 3 m active volume. The ND complex will also include a gaseous argon detector and a beam monitor. The DUNE Precision Reaction-Independent Spectrum Measurement (PRISM)'s oscillation analysis technique is a novel way to do long-baseline neutrino oscillation physics using DUNE's moveable neutrino detector. The DUNE ND LAr and GAr detectors will be on a movable axis perpendicular to the beamline. This moveable ND allows PRISM to find linear combinations of ND muon neutrino fluxes that closely match an oscillated muon neutrino flux at the FD.