期刊
PHYSICAL REVIEW D
卷 96, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.072006
关键词
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资金
- Fermi Research Alliance, LLC (FRA) [DE-AC02-07CH11359]
- U.S. Department of Energy
- U.S. National Science Foundation
- Department of Science and Technology, India
- European Research Council
- MSMT CR, GA UK, Czech Republic
- RAS, Russia
- RMES, Russia
- RFBR, Russia
- CNPq, Brazil
- FAPEG, Brazil
- State and University of Minnesota
- STFC [MINOS/MINOS+, ST/N000307/1, ST/N000285/1, 1698510] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Physics [1607381] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1506309] Funding Source: National Science Foundation
We report results from the first search for sterile neutrinos mixing with active neutrinos through a reduction in the rate of neutral-current interactions over a baseline of 810 km between the NOvA detectors. Analyzing a 14-kton detector equivalent exposure of 6.05 x 10(20) protons-on-target in the NuMI beam at Fermilab, we observe 95 neutral-current candidates at the Far Detector compared with 83.5 +/- 9.7(stat) +/- 9.4(syst) events predicted assuming mixing only occurs between active neutrino species. No evidence for upsilon(mu) -> upsilon(mu) transitions is found. Interpreting these results within a 3 + 1 model, we place constraints on the mixing angles theta(24) < 20.8 degrees and theta(34) < 31.2 degrees at the 90% C.L. for 0.05 eV(2) <= Delta m(41)(2) <= 0.5 eV(2), the range of mass splittings that produce no significant oscillations over the Near Detector baseline.
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