Abstract
We report results from the first search for transitions by the NOvA experiment. In an exposure equivalent to protons-on-target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of (syst.) events based on the Near Detector measurement. A secondary analysis observes 11 events with a background of (syst.). The excess of events observed in the primary analysis disfavors in the inverted mass hierarchy at the 90% C.L.
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