Background-independent measurement of θ13 in Double Chooz
2014
The oscillation results published by the Double
ChoozCollaboration in 2011 and 2012 rely on
backgroundmodels substantiated by reactor-on data. In this analysis, we present a
background-model-independent measurement of the mixing angle θ13 by including 7.53 days of reactor-off data. A global fit of the observed antineutrino rates for different reactor power conditions is performed, yielding a measurement of both θ13 and the total
backgroundrate. The results on the mixing angle are improved significantly by including the reactor-off data in the fit, as it provides a direct measurement of the total
backgroundrate. This reactor rate modulation analysis considers antineutrino candidates with
neutron captureson both Gd and H, whose combination yields sin2(2θ13)=0.102±0.028(stat.)±0.033(syst.). The results presented in this study are fully consistent with the ones already published by Double
Chooz, achieving a competitive precision. They provide, for the first time, a determination of θ13 that does not depend on a
backgroundmodel.
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