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The full physics potential of the next-generation Deep Underground NeutrinoExperiment (DUNE) is still being explored. In particular, there have been somerecent studies on the possibility of improving DUNE's neutrino energyreconstruction. The main motivation is that a better determination of theneutrino energy in an event-by-event basis will translate into an improvedmeasurement of the Dirac $CP$ phase and other neutrino oscillation parameters.To further motivate studies and improvements on the neutrino energyreconstruction, we evaluate the impact of energy resolution at DUNE on anillustrative new physics scenario, viz. non-standard interactions (NSI) ofneutrinos with matter. We show that a better energy resolution in comparison tothe ones given in the DUNE conceptual and technical design reports maysignificantly enhance the experimental sensitivity to NSI, particularly whendegeneracies are present. While a better reconstruction of the firstoscillation peak helps disentangling standard $CP$ effects from those comingfrom NSIs, we find that the second oscillation peak also plays a nontrivialrole in improving DUNE's sensitivity.

Impact of Improved Energy Resolution on DUNE sensitivity to Neutrino Non-Standard Interactions