Search for $CP$-Violating Neutrino Nonstandard Interactions with the NOvA Experiment

Abstract

This Letter reports a search for charge-parity ($CP$) 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 ${\nu }_{\mu }({\bar{\nu }}_{\mu })\to {\nu }_{\mu }({\bar{\nu }}_{\mu })$ and ${\nu }_{\mu }({\bar{\nu }}_{\mu })\to {\nu }_e({\bar{\nu }}_e)$ oscillation channels are used to measure the effect of the NSI parameters ${\epsilon }_{e\mu }$ and ${\epsilon }_{e\tau }$. With 90% CL the magnitudes of the NSI couplings are constrained to be $|{\epsilon }_{e\mu }|\lesssim 0.3$ and $|{\epsilon }_{e\tau }|\lesssim 0.4$. A degeneracy at $|{\epsilon }_{e\tau }|\approx 1.8$ is reported, and we observe that the presence of NSI limits sensitivity to the standard $CP$ phase ${\delta }_{\text{CP}}$.

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Cited by in corpus (3)

• Towards First Detection of the Solar MSW Transition With JUNO
• ${\delta }_{CP}$-free constraints on NSI parameters ${\epsilon }_{e\mu }$ and ${\epsilon }_{e\tau }$ using high-purity ${\nu }_{\mu }$ CC events at IceCube DeepCore
• Probing new physics scenarios using high energy events at NOvA far detector