First measurement of electron neutrino appearance in NOvA

NOvA Collaboration

Research output: Contribution to journalArticlepeer-review

187 Scopus citations


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.

Original languageEnglish (US)
Article number151806
JournalPhysical Review Letters
Issue number15
StatePublished - Apr 13 2016

ASJC Scopus subject areas

  • General Physics and Astronomy


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