Design, Construction, and Implementation of an Error-band around DUNE's Baseline Model

The Deep Underground Neutrino Experiment (DUNE) emphasizes building precise detectors to carry out comprehensive neutrino oscillation measurements which include the measurement of the charge parity (CP) phase, measurement of the mixing angle Θ₂₃, and determination of the neutrino mass ordering. A suite of Near Detectors (ND), located near the beam source at Fermilab, will be used to constrain the neutrino flux and cross section on argon nuclei of the unoscillated beam. Oscillation parameters are extracted by comparing the measured event rates in the oscillated beam at the Far Detector with the unoscillated beam. The ultimate sensitivity of the experiment depends on the ability of the ND to constrain the flux and cross section models, which requires that the full a priori uncertainties be well characterized. Neutrino simulations use an experiment's beamline geometry, detectors, and flux to replicate ionization patterns consistent with experiments while characterizing interaction channels. Shifting the number of interaction channels that occur in a given simulation by a discrete amount is defined as a "Reweight'' and is used in visualizing the new "event'' properties given the circumstantial change. By reweighting all events in a given experiment multiple times and gathering the event properties, an error-band that demonstrates the simulation's 1σ uncertainty can be drawn and used to compare with other existing neutrino simulations and real-world data collected by previous neutrino experiments.