Reactor electron antineutrino disappearance in the Double Chooz   experiment
  The Double Chooz experiment has observed 8,249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years (reactor power x detector mass x livetime) exposure using a 10.3 cubic meter fiducial volume detector located at 1050 m from the reactor cores of the Chooz nuclear power plant in France. The expectation in case of theta13 = 0 is 8,937 events. The deficit is interpreted as evidence of electron antineutrino disappearance. From a rate plus spectral shape analysis we find sin^2 2{\theta}13 = 0.109 \pm 0.030(stat) \pm 0.025(syst). The data exclude the no-oscillation hypothesis at 99.8% CL (2.9{\sigma}). 
Y. Abe, C. Aberle, J. C. dos Anjos, J. C. Barriere, M. Bergevin, A.   Bernstein, T. J. C. Bezerra, L. Bezrukhov, E. Blucher,...
hep-ex physics.ins-det