Double Chooz and recent results

Double Chooz is a reactor ¯νe disappearance experiment located in France near the power plant of Chooz. The main goal of the experiment is the measurement of the θ13 mixing angle and in 2011 for the first time the experiment observed an indication for a non-zero value of such an oscillation parameter. The mixing angle was successively measured using only the far detector finding the best fit value of sin2(2θ13) = 0.109 ± 0.035. The near detector is under construction and will start data taking by the middle of 2014 allowing to reduce the systematic errors. In this paper I make a review of the experimental results, focusing in particular on independent analyses such as the measurement of the mixing angle θ13 relying on the neutron absorption on gadolinium and hydrogen, and on the reactor rate modulation. I also present for the first time the capability of Double Chooz to identify the ortho-positronium state on event-by-event basis, which could be an additional handle for the electron/positron discrimination in future liquid-scintillator–based detectors