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Measurement of

d^{2} σ / d | \vec{q} | d E_{avail}

in charged current

ν_{μ}

-nucleus interactions at

⟨ E_{ν} ⟩ = 1.86 GeV

using the NOvA Near Detector

https://doi.org/10.1103/PhysRevD.111.052009

Acero, M A; Acharya, B; Adamson, P; Aliaga, L; Anfimov, N; Antoshkin, A; Arrieta-Diaz, E; Asquith, L; Aurisano, A; Back, A; et al (March 2025, Physical Review D)

Double- and single-differential cross sections for inclusive charged-current

ν_{μ}

-nucleus scattering are reported for the kinematic domain 0 to

2 GeV / c

in three-momentum transfer and 0 to 2 GeV in available energy, at a mean

ν_{μ}

energy of 1.86 GeV. The measurements are based on an estimated 995,760

ν_{μ}

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

ν_{μ}

-nucleus scattering that are constrained by a data control sample. Models for 2-particle-2-hole processes are rated by

χ^{2}

comparisons of the predicted-versus-measured

ν_{μ}

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 Society2025

Free, publicly-accessible full text available March 1, 2026

This Letter reports a search for charge-parity (

C P

) 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

ν_{μ} ({\bar{ν}}_{μ}) \to ν_{μ} ({\bar{ν}}_{μ})

and

ν_{μ} ({\bar{ν}}_{μ}) \to ν_{e} ({\bar{ν}}_{e})

oscillation channels are used to measure the effect of the NSI parameters

ϵ_{e μ}

and

ϵ_{e τ}

. With 90% CL the magnitudes of the NSI couplings are constrained to be

| ϵ_{e μ} | ≲ 0.3

and

| ϵ_{e τ} | ≲ 0.4

. A degeneracy at

| ϵ_{e τ} | \approx 1.8

is reported, and we observe that the presence of NSI limits sensitivity to the standard

C P

phase

δ_{C P}

. Published by the American Physical Society2024

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