Abstract
The Daya Bay reactor neutrino experiment has observed the disappearance of electron antineutrinos from nuclear reactors at ∼kilometer baselines. The relative measurement of the ν¯e rate and spectrum between near and far detectors allows for a precision measurement of the oscillation parameters sin2 2θ13 and |Δmee2|. Two new antineutrino detectors (ADs) were installed in summer 2012, bringing the experiment to the final 8-AD configuration. With 621 days of data, Daya Bay has measured sin2 2θ13 = 0.084 ± 0.005 and |Δmee2|=2.44−0.11+0.10×10−3 eV2. This is the most precise measurement of sin2 2θ13 to date and the most precise measurement of |Δmee2| in this channel. Several other analyses are also performed, including an independent measurement of sin2 2θ13 using ν¯e samples tagged by neutron capture on hydrogen, a search for light sterile neutrinos, and a measurement of the absolute reactor antineutrino flux.
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