First measurement of electron neutrino appearance in NOvA

0470465 - FZÚ 2017 RIV US eng J - Článek v odborném periodiku
Adamson, P. - Ader, C. - Andrews, M. - Lokajíček, Miloš - Zálešák, Jaroslav … celkem 260 autorů
First measurement of electron neutrino appearance in NOvA.
Physical Review Letters. Roč. 116, č. 15 (2016), 1-7, č. článku 151806. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT(CZ) LG15047; GA MŠMT LM2015068
Institucionální podpora: RVO:68378271
Klíčová slova: mass: hierarchy * background * NOvA * near detector * far detector * experimental results
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 8.462, rok: 2016

We report results from the first search for νμ→νe transitions by the NOvA experiment. In an exposure equivalent to 2.74×1020 protons on target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of 0.99±0.11(syst) events based on the Near Detector measurement. A secondary analysis observes 11 events with a background of 1.07±0.14(syst). The 3.3σ excess of events observed in the primary analysis disfavors 0.1π<δCP<0.5π in the inverted mass hierarchy at the 90% C.L.

Trvalý link: http://hdl.handle.net/11104/0268098