First measurement of electron neutrino appearance in NOvA
P. Adamson, C. Ader, M. Andrews, N. Anfimov, I. Anghel, K. Arms, E., Arrieta-Diaz, A. Aurisano, D. S. Ayres, C. Backhouse, M. Baird, B. A. Bambah,, K. Bays, R. Bernstein, M. Betancourt, V. Bhatnagar, B. Bhuyan, J. Bian, K., Biery, T. Blackburn, V. Bocean, D. Bogert

TL;DR
This paper reports the first measurement of electron neutrino appearance in the NOvA experiment, observing a significant excess of events that provides insights into neutrino oscillation parameters.
Contribution
It presents the first search for $ u_ o u_e$ transitions with new experimental data and analysis, advancing understanding of neutrino oscillations and CP violation.
Findings
Observed 6 events with a background of 0.99 in primary analysis.
Detected a 3.3σ excess of events, indicating potential neutrino oscillation effects.
Disfavors certain CP-violating phase ranges at 90% confidence level.
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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