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The Daya Bay experiment was designed to be the largest and the deepestunderground among the many current-generation reactor antineutrino experiments.With functionally identical detectors deployed at multiple baselines, theexperiment aims to achieve the most precise measurement of $\sin^22\theta_{13}$. The antineutrino rates measured in the two near experimentalhalls are used to predict the rate at the far experimental hall (averagedistance of 1648 m from the reactors), assuming there is no neutrinooscillation. The ratio of the measured over the predicted far-hall antineutrinorate is then used to constrain the $\sin^2 2\theta_{13}$. The relativesystematic uncertainty on this ratio is expected to be 0.2$\sim$0.4%. In thistalk, we present an improved measurement of the electron antineutrinodisappearance at Daya Bay. With data of 139 days, the deficit of theantineutrino rate in the far experimental hall was measured to be 0.056 $\pm$0.007 (stat.) $\pm$ 0.003 (sys.). In the standard three-neutrino framework, the$\sin^2 2 \theta_{13}$ was determined to be 0.089 $\pm$ 0.011 at the 68%confidence level in a rate-only analysis.

Improved Measurement of Electron Antineutrino Disappearance at Daya Bay (Proceeding to NuFact12)