Results from the Daya Bay Reactor Neutrino Experiment

The Daya Bay Reactor Neutrino Experiment was designed to achieve a sensitivity on the value of to better than 0.01 at 90% CL. The experiment consists of eight antineutrino detectors installed underground at different baselines from six nuclear reactors. With data collected with six antineutrino detectors for 55 days, Daya Bay announced the discovery of a non-zero value for with a significance of 5.2 standard deviations in March 2012. The most recent analysis with 139 days of data acquired in a six-detector configuration yields , which is the most precise measurement of to date.