Double Chooz: Latest results
J. I. Crespo-Anad\'on (for the Double Chooz collaboration)

TL;DR
The Double Chooz experiment measured the neutrino mixing angle θ13 with improved accuracy, confirming previous results and observing a deviation likely due to reactor flux effects, using a refined analysis over 467.90 days.
Contribution
This paper presents the latest results on θ13 measurement with a revised analysis that enhances signal efficiency and reduces uncertainties, supporting the robustness of previous findings.
Findings
Measured sin^2 2θ13 = 0.090^{+0.032}_{-0.029}
Observed a deviation above 4 MeV energy, attributed to reactor flux effects
Confirmed θ13 value through rate-only analysis
Abstract
The latest results from the Double Chooz experiment on the neutrino mixing angle are presented. A detector located at an average distance of 1050 m from the two reactor cores of the Chooz nuclear power plant has accumulated a live time of 467.90 days, corresponding to an exposure of 66.5 GW-ton-year (reactor power detector mass live time). A revised analysis has boosted the signal efficiency and reduced the backgrounds and systematic uncertainties compared to previous publications, paving the way for the two detector phase. The measured is extracted from a fit to the energy spectrum. A deviation from the prediction above a visible energy of 4 MeV is found, being consistent with an unaccounted reactor flux effect, which does not affect the result. A consistent value of is measured…
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