Constraining Sterile Neutrinos Using Reactor Neutrino Experiments

Abstract

Models of neutrino mixing involving one or more sterile neutrinos have resurrected their importance in the light of recent cosmological data. In this case, reactor antineutrino experiments offer an ideal place to look for signatures of sterile neutrinos due to their impact on neutrino flavor transitions. In this work, we show that the high-precision data of the Daya Bay experi\-ment constrain the 3+1 neutrino scenario imposing upper bounds on the relevant active-sterile mixing angle ${\sin }^{2}2{\theta }_{14}\lesssim 0.06$ at 3$\sigma$ confidence level for the mass-squared difference $\Delta m_{41}^2$ in the range $(10^{-3},10^{-1})\mathrm{e}{\mathrm{V}}^2$. The latter bound can be improved by six years of running of the JUNO experiment, ${\sin }^{2}2{\theta }_{14}\lesssim 0.016$, although in the smaller mass range $\Delta m_{41}^2\in (10^{-4},10^{-3}){\mathrm{eV}}^2$. We have also investigated the impact of sterile neutrinos on precision measurements of the standard neutrino oscillation parameters ${\theta }_{13}$ and $\Delta m_{31}^2$ (at Daya Bay and JUNO), ${\theta }_{12}$ and $\Delta m_{21}^2$ (at JUNO), and most importantly, the neutrino mass hierarchy (at JUNO). We find that, except for the obvious situation where $\Delta m_{41}^2\sim \Delta m_{31}^2$, sterile states do not affect these measurements substantially.

arXiv comment23 pages, 9 figures, more discussions added, matches the published version

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