Recent Results From The Daya Bay Experiment

Abstract

The Daya Bay reactor neutrino experiment has observed the disappearance of electron antineutrinos from nuclear reactors at $\sim$kilometer baselines. The relative measurement of the $\bar\nu_e$ rate and spectrum between near and far detectors allows for a precision measurement of the oscillation parameters $\sin^22\theta_{13}$ and $|\Delta{m}^2_{ee}|$. 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 $\sin^22\theta_{13} = 0.084 \pm 0.005$ and $|\Delta{m}^2_{ee}| = 2.44^{+0.10}_{-0.11} \times 10^{-3}$ eV$^2$. This is the most precise measurement of $\sin^22\theta_{13}$ to date and the most precise measurement of $|\Delta{m}^2_{ee}|$ in this channel. Several other analyses are also performed, including an independent measurement of $\sin^22\theta_{13}$ using $\bar\nu_e$ samples tagged by neutron capture on hydrogen, a search for light sterile neutrinos, and a measurement of the absolute reactor antineutrino flux.