期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.151802
关键词
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资金
- 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 and FAPEG, Brazil
- state and University of Minnesota
- Fermi Research Alliance, LLC [De-AC02-07CH11359]
- U.S. DOE
- Direct For Mathematical & Physical Scien
- Division Of Physics [1506309] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1607410, 1607381] Funding Source: National Science Foundation
- STFC [ST/N000307/1, MINOS/MINOS+, ST/N000285/1, 1698510] Funding Source: UKRI
This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of 6.05 x 10(20) protons on target from the NuMI beam at the Fermi National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal theta(23) mixing (theta(23) = pi/4). Assuming the normal mass hierarchy, we find Delta m(32)(2) = (2.67 +/- 0.11) x 10(-3) eV(2) and sin(2) theta(23)at the two statistically degenerate values 0.404(-0.022)(+0.030) and 0.624(-0.030)(+0.022), both at the 68% confidence level. Our data disfavor the maximal mixing scenario with 2.6 sigma significance.
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