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We present a search for Lorentz violation with 8249 candidate electronantineutrino events taken by the Double Chooz experiment in 227.9 live days ofrunning. This analysis, featuring a search for a sidereal time dependence ofthe events, is the first test of Lorentz invariance using a reactor-basedantineutrino source. No sidereal variation is present in the data and thedisappearance results are consistent with sidereal time independentoscillations. Under the Standard-Model Extension (SME), we set the first limitson fourteen Lorentz violating coefficients associated with transitions betweenelectron and tau flavor, and set two competitive limits associated withtransitions between electron and muon flavor.

First Test of Lorentz Violation with a Reactor-based Antineutrino Experiment