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This Week at Physics

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Event Number 2625

  Tuesday, March 13th, 2012

High Energy Seminar
Observation of electron-antineutrino disappearance at Daya Bay
Time: 3:00 pm
Place: 4274 Chamberlin
Speaker: Karsten M. Heeger, University of Wisconsin
Abstract: The Daya Bay Reactor Neutrino Experiment has measured a non-zero value for the neutrino mixing angle theta13 with a significance of 5.2 standard deviations. Antineutrinos from six 2.9 GWth reactors were detected in six antineutrino detectors deployed in two near (flux-weighted baseline 470 m and 576 m) and one far (1648 m) underground experimental halls. With 55 days of data, 10416 (80376) electron antineutrino candidates were detected at the far hall (near halls). The ratio of the observed to expected number of antineutrinos at the far hall is R=0.940 +/- 0.011(stat) +/- 0.004(syst). A rate-only analysis finds sin^22theta13=0.092 +/- 0.016(stat) +/- 0.005(syst) in a three-neutrino framework.
Host: Herndon
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