Search for Sub-eV Sterile Neutrinos at RENO

Physical Review Letters
J H ChoiRENO Collaboration

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 294 m (near) and 1383 m (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.

References

May 18, 2013·Physical Review Letters·A A Aguilar-ArevaloUNKNOWN MiniBooNE Collaboration
Jun 11, 2016·Physical Review Letters·J H ChoiUNKNOWN RENO Collaboration
Apr 8, 2017·Physical Review Letters·Y J KoUNKNOWN NEOS Collaboration
Dec 1, 2018·Physical Review Letters·G BakUNKNOWN RENO Collaboration
Aug 29, 2020·Physical Review Letters·P AdamsonUNKNOWN <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>MINOS</mi><mo>+</mo></mrow></math> Collaboration

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