The Double Chooz experiment consists of two identical detectors, studying the coming from Chooz nuclear reactors. The goal is to measure the unknown leptonic parameter θ13. The far detector, sensitive to θ13, has already been taking data since April 2011. The near one, aiming at monitoring the reactor flux, will be installed in 2012. We present the concept, detection method, estimated sensitivity and discovery potential of the experiment as well as its first results on θ13.
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