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First Measurement of Electron Neutrino Appearance in NOvA
Adamson, P. Adler, C. Andrews, N. Colo, M. Devan, A. Liu, J. Mathis, M. Nelson, J. K. Radovic, A. Vahle, P.
Adamson, P.
Adler, C.
Andrews, N.
Colo, M.
Devan, A.
Liu, J.
Mathis, M.
Nelson, J. K.
Radovic, A.
Vahle, P.
Abstract
We report results from the first search for nu(mu) -> nu(e) transitions by the NOvA experiment. In an exposure equivalent to 2.74 x 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 +/- 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 3.3 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.
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2016-01-01
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Physics
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https://doi.org/10.1103/PhysRevLett.116.151806