Search for Signatures of Sterile Neutrinos with Double Chooz

Abstract

We present a search for signatures of neutrino mixing of electron anti-neutrinos with additional hypothetical sterile neutrino flavors using the Double Chooz experiment. The search is based on data from 5 years of operation of Double Chooz, including 2 years in the two-detector configuration. The analysis is based on a profile likelihood, i.e.\ comparing the data to the model prediction of disappearance in a data-to-data comparison of the two respective detectors. The analysis is optimized for a model of three active and one sterile neutrino. It is sensitive in the typical mass range $5\cdot 10^{-3}$ eV${}^2\lesssim \Delta m_{41}^2\lesssim 3\cdot 10^{-1}$ eV${}^2$ for mixing angles down to ${\sin }^{2}2{\theta }_{14}\gtrsim 0.02$. No significant disappearance additionally to the conventional disappearance related to ${\theta }_{13}$ is observed and correspondingly exclusion bounds on the sterile mixing parameter ${\theta }_{14}$ as function of $\Delta m_{41}^2$ are obtained.

arXiv commentaccepted for publication by EPJC

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