Measurement of antineutrino oscillation with the full detector configuration at Daya Bay

Abstract

In this poster, we present the latest measurement of electron antineutrino disappearance using the fully constructed Daya Bay Reactor Neutrino Experiment. A total exposure of $6.9 \times 10^5$ GW$_{\mathrm{th}}$ ton days was achieved in November 2013 after 617 day of data taking. The most precise estimates to date of the neutrino mass and mixing parameters $|\Delta \mathrm{m}^2_{ee}|$ and $\sin^2 2 \theta_{13}$ were obtained with an analysis of the relative antineutrino rates and energy spectra between detectors. The value of the two parameters was found to be $\sin^2 2 \theta_{13} = 0.084 \pm 0.005$ and $|\Delta \mathrm{m}^2_{ee}| = (2.42 \pm 0.11) \times 10^{-3}\,\mathrm{eV}^2$. This report focuses in particular on describing how improvements in the calibration and in the energy response model contributed to achieve this result.