First Test of Lorentz Violation with a Reactor-based Antineutrino   Experiment
  We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring a search for a sidereal time dependence of the events, is the first test of Lorentz invariance using a reactor-based antineutrino source. No sidereal variation is present in the data and the disappearance results are consistent with sidereal time independent oscillations. Under the Standard-Model Extension (SME), we set the first limits on fourteen Lorentz violating coefficients associated with transitions between electron and tau flavor, and set two competitive limits associated with transitions between electron and muon flavor. 
Double Chooz Collaboration: Y. Abe, C. Aberle, J. C. dos Anjos, M.   Bergevin, A. Bernstein, T. J. C. Bezerra, L. Bezrukhov,...
hep-ex