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Double- and single-differential cross sections for inclusive charged-current -nucleus scattering are reported for the kinematic domain 0 to in three-momentum transfer and 0 to 2 GeV in available energy, at a mean energy of 1.86 GeV. The measurements are based on an estimated 995,760 charged-current (CC) interactions in the scintillator medium of the NOvA Near Detector. The subdomain populated by 2-particle-2-hole (2p2h) reactions is identified by the cross section excess relative to predictions for -nucleus scattering that are constrained by a data control sample. Models for 2-particle-2-hole processes are rated by comparisons of the predicted-versus-measured CC inclusive cross section over the full phase space and in the restricted subdomain. Shortfalls are observed in neutrino generator predictions obtained using the theory-based València and SuSAv2 2p2h models. Published by the American Physical Society2025more » « lessFree, publicly-accessible full text available March 1, 2026
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We report a search for neutrino oscillations to sterile neutrinos under a model with three active and one sterile neutrinos ( model). This analysis uses the NOvA detectors exposed to the NuMI beam, running in neutrino mode. The data exposure, protons on target, doubles that previously analyzed by NOvA, and the analysis is the first to use charged-current interactions in conjunction with neutral-current interactions. Neutrino samples in the near and far detectors are fitted simultaneously, enabling the search to be carried out over a range extending 2 (3) orders of magnitude above (below) . NOvA finds no evidence for active-to-sterile neutrino oscillations under the model at 90% confidence level. New limits are reported in multiple regions of parameter space, excluding some regions currently allowed by IceCube at 90% confidence level. We additionally set the most stringent limits for anomalous appearance for . Published by the American Physical Society2025more » « lessFree, publicly-accessible full text available February 1, 2026
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Abstract Measuring observables to constrain models using maximum-likelihood estimation is fundamental to many physics experiments. Wilks' theorem provides a simple way to construct confidence intervals on model parameters, but it only applies under certain conditions. These conditions, such as nested hypotheses and unbounded parameters, are often violated in neutrino oscillation measurements and other experimental scenarios. Monte Carlo methods can address these issues, albeit at increased computational cost. In the presence of nuisance parameters, however, the best way to implement a Monte Carlo method is ambiguous. This paper documents the method selected by the NOvA experiment, the profile construction. It presents the toy studies that informed the choice of method, details of its implementation, and tests performed to validate it. It also includes some practical considerations which may be of use to others choosing to use the profile construction.more » « lessFree, publicly-accessible full text available February 1, 2026
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This Letter reports a search for charge-parity ( ) symmetry violating nonstandard interactions (NSI) of neutrinos with matter using the NOvA Experiment, and examines their effects on the determination of the standard oscillation parameters. Data from and oscillation channels are used to measure the effect of the NSI parameters and . With 90% CL the magnitudes of the NSI couplings are constrained to be and . A degeneracy at is reported, and we observe that the presence of NSI limits sensitivity to the standard phase . Published by the American Physical Society2024more » « lessFree, publicly-accessible full text available November 1, 2025
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NOvA is a long-baseline neutrino oscillation experiment that measures oscillations in charged-current (disappearance) and (appearance) channels, and their antineutrino counterparts, using neutrinos of energies around 2 GeV over a distance of 810 km. In this work we reanalyze the dataset first examined in our previous paper [] using an alternative statistical approach based on Bayesian Markov chain Monte Carlo. We measure oscillation parameters consistent with the previous results. We also extend our inferences to include the first NOvA measurements of the reactor mixing angle , where we find , and the Jarlskog invariant, where we observe no significant preference for the -conserving value over values favoring violation. We use these results to examine the effects of constraints from short-baseline measurements of using antineutrinos from nuclear reactors when making NOvA measurements of . Our long-baseline measurement of is shown to be consistent with the reactor measurements, supporting the general applicability and robustness of the Pontecorvo-Maki-Nakagawa-Sakata framework for neutrino oscillations. Published by the American Physical Society2024more » « lessFree, publicly-accessible full text available July 1, 2025