5 research outputs found
First measurement of electron neutrino appearance in NOvA
We report results from the first search for νμ→νe 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
First measurement of muon-neutrino disappearance in NOvA
This paper reports the first measurement using the NOvA detectors of νμ disappearance in a νμ beam. The analysis uses a 14 kton-equivalent exposure of 2.74×1020 protons-on-target from the Fermilab NuMI beam. Assuming the normal neutrino mass hierarchy, we measure Δm232=(2.52+0.20−0.18)×10−3 eV2 and sin2θ23 in the range 0.38–0.65, both at the 68% confidence level, with two statistically degenerate best-fit points at sin2θ23=0.43 and 0.60. Results for the inverted mass hierarchy are also presented
First Measurement of Electron Neutrino Appearance in NOvA
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