New Results from the Daya Bay Reactor Neutrino Experiment (1402.6439v1)
Abstract: This presentation describes a precision result of the neutrino mixing parameter, $\sin2 2\theta_{13}$, and the first direct measurement of the antineutrino mass-squared difference $\sin2(\Delta_{ee}) \equiv \cos2 \theta_{12} \sin2 \Delta_{31} + \sin2 \theta_{12} \sin2 \Delta_{32}$ from the Daya Bay Reactor Neutrino Experiment. The above results are based on the six detector data-taking from 24 December 2011 to 28 July 2012. By using the observed antineutrino rate and the energy spectrum analysis, the results are $\sin2 2\theta_{13}=0.090{+0.008}_{-0.009}$ and $| \Delta m2_{ee}| = 2.59{+0.19}_{-0.20} \cdot 10{-3} $eV$2$ with a $\chi2$/NDF of 162.7/153. The value of $| \Delta m2_{ee}| $ is consistent with $| \Delta m2_{\mu\mu}|$ measured in muon neutrino beam experiments.