Publication Date:
2021-08-01
Description:
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 $${5 imes 10^{-3}},mathrm{eV}^2 lesssim varDelta m^2_{41} lesssim {3 imes 10^{-1}},mathrm{eV}^2 $$ 5 × 10 - 3 eV 2 ≲ Δ m 41 2 ≲ 3 × 10 - 1 eV 2 for mixing angles down to $$sin ^2 2heta _{14} gtrsim {0.02} $$ sin 2 2 θ 14 ≳ 0.02 . No significant disappearance additionally to the conventional disappearance related to $$heta _{13} $$ θ 13 is observed and correspondingly exclusion bounds on the sterile mixing parameter $$heta _{14} $$ θ 14 as a function of $$ varDelta m^2_{41} $$ Δ m 41 2 are obtained.
Print ISSN:
1434-6044
Electronic ISSN:
1434-6052
Topics:
Physics
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