Recent Results from Daya Bay

Abstract

The Daya Bay reactor neutrino experiment observed electron antineutrino disappearance associated with $\theta_{13}$ with a significance better than $5\sigma$ in 2012. The final two of eight antineutrino detectors were installed in the summer of 2012. Including the 404 days of data collected with the full detector configuration resulted in a 3.6 times increase of statistics over the previous result with the 6-AD configuration. With improvements of the systematic uncertainties and better estimation of backgrounds, Daya Bay has measured $\sin^22\theta_{13} = 0.084\pm0.005$ and $|\Delta m^2_{ee}|=2.42^{+0.10}_{-0.11}\times 10^{-3}$~eV$^2$. This is the most precise measurement of $\sin^22\theta_{13}$ to date and the most precise measurement of of $|\Delta m^2_{ee}|$ via electron antineutrino disappearance. Several other analysis results are presented, including an independent measurement of $\theta_{13}$ using inverse-beta decays associated with neutron capture on hydrogen, a measurement of reactor antineutrino flux and spectrum, and a search for light sterile neutrino mixing.