Acero, MA;
Adamson, P;
Aliaga, L;
Anfimov, N;
Antoshkin, A;
Arrieta-Diaz, E;
Asquith, L;
... Zwaska, R; + view all
(2021)
Search for Active-Sterile Antineutrino Mixing Using Neutral-Current Interactions with the NOvA Experiment.
Physical Review Letters
, 127
(20)
, Article 201801. 10.1103/PhysRevLett.127.201801.
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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 x 10^{20} 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 \bar{v}_{m} → \bar{s} oscillation is observed. Interpreting this result within a 3 + 1 model, constraints are placed on the mixing angles θ_{24} < 25° and θ_{34} < 32° at the 90% C.L. for 00.5eV^{2} ≤ Δm^{2}_{41} ≤ 0.5 eV^{2}, 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.
| Type: | Article |
|---|---|
| Title: | Search for Active-Sterile Antineutrino Mixing Using Neutral-Current Interactions with the NOvA Experiment |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.127.201801 |
| Publisher version: | https://doi.org/10.1103/PhysRevLett.127.201801 |
| Language: | English |
| Additional information: | © 2021 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10139541 |
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