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First Measurement of Electron Neutrino Appearance in NOvA

P. Adamson et al. (NOvA Collaboration)
Phys. Rev. Lett. 116, 151806 – Published 13 April 2016
Physics logo See Viewpoint: Ghostly Neutrino Comes into Sharper Focus

Abstract

We report results from the first search for νμνe 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.

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  • Received 19 January 2016

DOI:https://doi.org/10.1103/PhysRevLett.116.151806

© 2016 American Physical Society

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Particles & Fields

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Ghostly Neutrino Comes into Sharper Focus

Published 13 April 2016

The first results from the NOvA experiment set new constraints on charge-parity violation in neutrinos and on the ordering of neutrino masses.

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Vol. 116, Iss. 15 — 15 April 2016

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