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Search for Signatures of Sterile Neutrinos with Double Chooz

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arxiv 2009.05515 v3 pith:3XGPQTZK submitted 2020-09-11 hep-ex physics.ins-det

Search for Signatures of Sterile Neutrinos with Double Chooz

classification hep-ex physics.ins-det
keywords sterilechoozdisappearancedoublemixingneutrinosearchtheta
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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^2_{41} \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^2_{41} $ are obtained.

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