Search for active-sterile neutrino mixing using neutral-current interactions in NOvA

0484248 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Adamson, P. - Aliaga, L. - Ambrose, D. - Lokajíček, Miloš - Zálešák, Jaroslav … celkem 180 autorů
Search for active-sterile neutrino mixing using neutral-current interactions in NOvA.
Physical Review D. Roč. 96, č. 7 (2017), s. 1-9, č. článku 072006. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT LM2015068; GA MŠMT(CZ) LG15047
Institucionální podpora: RVO:68378271
Klíčová slova: NOvA * Fermilab * mass difference * near detector * far detector * mixing angle * neutrino * oscillation * experimental results
Obor OECD: Particles and field physics
Impakt faktor: 4.394, rok: 2017

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 6.05×1020 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 νμ→νs transitions is found. Interpreting these results within a 3+1 model, we place constraints on the mixing angles θ24<20.8° and θ34<31.2° at the 90% C.L. for 0.05  eV2≤Δm412≤0.5  eV2, the range of mass splittings that produce no significant oscillations over the Near Detector baseline.

Trvalý link: http://hdl.handle.net/11104/0279380