The Daya Bay Reactor Neutrino Experiment has measured a non-zero value for the neutrino mixing angle 13 with a significance of 5.2 standard deviations. Antineutrinos from six 2.9 GW_th reactors were detected in six antineutrino detectors deployed in two near (flux-weighted baseline 470 m and 576 m) and one far (1648 m) underground experimental halls. With 55 days of data, 10416 (80376) electron antineutrino candidates were detected at the far hall (near halls). The ratio of the observed to expected number of antineutrinos at the far hall is R=0.940±0.011(stat)±0.004(syst). A rate-only analysis finds sin2 213 = 0.092 ± 0.016(stat) ±0.005(syst) in a three-neutrino framework.

　　PACS numbers: 14.60.Pq, 29.40.Mc, 28.50.Hw, 13.15.+g

　　Keywords: neutrino oscillation, neutrino mixing, reactor, Daya Bay

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