First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA

0511736 - FZÚ 2020 RIV US eng J - Journal Article
Acero, M. A. - Adamson, P. - Aliaga, L. - Filip, Peter - Hakl, František - Lokajíček, Miloš - Zálešák, Jaroslav … Total 200 authors
First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA.
Physical Review Letters. Roč. 123, č. 15 (2019), s. 1-8, č. článku 151803. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LM2015068
Institutional support: RVO:68378271 ; RVO:67985807
Keywords : elementary particles and fields * NOvA * background * experimental results
OECD category: Particles and field physics; Particles and field physics (UIVT-O)
Impact factor: 8.385, year: 2019
Method of publishing: Open access

The NOvA experiment has seen a 4.4σ signal of ν¯e appearance in a 2 GeV ν¯μ beam at a distance of 810 km. Using 12.33×1020 protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 ν¯μ→ν¯e candidates with a background of 10.3 and 102 ν¯μ→ν¯μ candidates. This new antineutrino data are combined with neutrino data to measure the parameters |Δm322|=2.48-0.06+0.11×10-3  eV2/c4 and sin2θ23 in the ranges from (0.53–0.60) and (0.45–0.48) in the normal neutrino mass hierarchy. The data exclude most values near δCP=π/2 for the inverted mass hierarchy by more than 3σ and favor the normal neutrino mass hierarchy by 1.9σ and θ23 values in the upper octant by 1.6σ.
Permanent Link: http://hdl.handle.net/11104/0301970