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Experimental search reports constraints on CP-violating non-standard neutrino interactions in NOvA data, indicating reduced sensitivity to standard oscillation parameters.
This Letter reports a search for charge-parity (CP) symmetry violating non-standard interactions (NSI) of neutrinos with matter using the NOvA Experiment, and examines their effects on the determination of the standard oscillation parameters. Data from νμ(ν̄μ)→νμ(ν̄μ) and νμ(ν̄μ)→νₑ(ν̄ₑ) oscillation channels are used to measure the effect of the NSI parameters εeμ and εeτ. With 90% C.L. the magnitudes of the NSI couplings are constrained to be |εeμ| \, 0.3 and |εeτ| \, 0.4. A degeneracy at |εeτ| \, ≈ 1.8 is reported, and we observe that the presence of NSI limits sensitivity to the standard CP phase δ_.
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Collaboration et al. (2024) studied this question.
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