Daya Bay Reactor Antineutrino Experiment

With 217 days of data-taking, using six antineutrino detectors deployed in three experimental halls near the Daya Bay Nuclear Power Plant complex, the Daya Bay experiment has obtainted sin22θ13 = 0.090−0.009+0.008 from the rate and energy spectra analysis under the three-neutrino framework. In addition, the value of effective mass-squared difference |Δmee2| = (2.59+0.19-0.20) × 10−3 eV2 is directly measured through νe disappearance channel for the first time, which is ee−0.20 consistent with the |Δm2 μμ| measured by muon neutrino disappearance channel.