Abstract
We report a search result for a light sterile neutrino oscillation with roughly 2200 live days of data in the RENO experiment. The search is performed by electron antineutrino (ν[over ¯]_{e}) disappearance taking place between six 2.8 GW_{th} reactors and two identical detectors located at 294m (near) and 1383m (far) from the center of the reactor array. A spectral comparison between near and far detectors can explore reactor ν[over ¯]_{e} oscillations to a light sterile neutrino. An observed spectral difference is found to be consistent with that of the three-flavor oscillation model. This yields limits on sin^{2}2θ_{14} in the 10^{-4}≲|Δm_{41}^{2}|≲0.5 eV^{2} region, free from reactor ν[over ¯]_{e} flux and spectrum uncertainties. The RENO result provides the most stringent limits on sterile neutrino mixing at |Δm_{41}^{2}|≲0.002 eV^{2} using the ν[over ¯]_{e} disappearance channel.
Highlights
We report a search result for a light sterile neutrino oscillation with roughly 2200 live days of data in the RENO experiment
The search is performed by electron antineutrino disappearance taking place between six 2.8 GWth reactors and two identical detectors located at 294 m and 1383 m from the center of the reactor array
The RENO result provides the most stringent limits on sterile neutrino mixing at jΔm241j ≲ 0.002 eV2 using the νe disappearance channel
Summary
Reactor νe interactions in the RENO experiment. According to this hypothesis, the survival probability for νe with an energy E and a distance L is approximately given by [11]. This indicates that the sterile neutrino oscillation with a mixing angle θ14 introduces an additional spectral distortion by a squared mass difference jΔm241j These oscillation parameters can be explored by a model independent spectral comparison of the reactor νe disappearance between near and far detectors. Because of various baselines between two detectors and six reactor cores, ranging from 300 m to nearly 1.5 km as shown, this search is sensitive to mixing between active and sterile neutrinos in the region of 10−4 ≲ jΔm241j ≲ 0.5 eV2. Baselines of near and far detectors from the six reactor cores
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