First measurement of electron neutrino appearance in NOvA

Abstract

We report results from the first search for ${\nu }_{\mu }\to {\nu }_e$ transitions by the NOvA experiment. In an exposure equivalent to $2.74\times 10^{20}$ protons-on-target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of $0.99\pm 0.11$ (syst.) events based on the Near Detector measurement. A secondary analysis observes 11 events with a background of $1.07\pm 0.14$ (syst.). The $3.3\sigma$ excess of events observed in the primary analysis disfavors $0.1\pi <{\delta }_{CP}<0.5\pi$ in the inverted mass hierarchy at the 90% C.L.

arXiv comment7 pages, 4 figures. Minor updates to match version accepted by journal

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