Search for active-sterile antineutrino mixing using neutral-current interactions with the NOvA experiment

Acero, M A, Adamson, P, Aliaga, L, Anfimov, N, Antoshkin, A, Asquith, L, Baird, M, Booth, A C, Hartnell, J, Kralik, R, Lasorak, P, Mayes, B, Mendez, D P, Porter, J C C, Zhang, Y and others, (2021) Search for active-sterile antineutrino mixing using neutral-current interactions with the NOvA experiment. Physical Review Letters, 127 (20). a201801 1-8. ISSN 0031-9007

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Abstract

This Letter reports results from the first long-baseline search for sterile antineutrinos mixing in an accelerator-based antineutrino-dominated beam. The rate of neutral-current interactions in the two NOvA detectors, at distances of 1 and 810 km from the beam source, is analyzed using an exposure of 12.51×1020 protons-on-target from the NuMI beam at Fermilab running in antineutrino mode. A total of 121 of neutral-current candidates are observed at the far detector, compared to a prediction of 122±11(stat.)±15(syst.) assuming mixing only between three active flavors. No evidence for ν¯μ→ν¯s oscillation is observed. Interpreting this result within a 3+1 model, constraints are placed on the mixing angles θ24<25° and θ34<32° at the 90% C.L. for 0.05 eV2≤Δm412≤0.5 eV2, the range of mass splittings that produces no significant oscillations at the near detector. These are the first 3+1 confidence limits set using long-baseline accelerator antineutrinos.

Item Type: Article
Keywords: NOvA Collaboration
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 10 Feb 2022 10:40
Last Modified: 10 Feb 2022 10:45
URI: http://sro.sussex.ac.uk/id/eprint/104288

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