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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 x 10(-3)
eV(2) less than or similar to Delta m(41)(2) less than or similar to 3 x
10(-1) eV(2) for mixing angles downto sin(2) 2 theta(14) greater than or
similar to 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 a function of Delta m(41)(2) are obtained.