Sterile neutrino analysis of reactor-neutrino oscillation

Abstract

Sterile neutrinos are one candidate to explain anomalies in neutrino oscillations. The mass-difference-driving oscillation between flavors can be probed only within specific combinations of baseline and flight energy. For a neutrino whose mass is completely unknown, it is necessary to scan all available ranges in spectrum and all accessible baselines. Here, we present four-neutrino analysis of the results announced by RENO and Daya Bay, which performed the definitive measurements of $\theta_{13}$ based on the disappearance of the inverse-beta-decay antineutrino at km-order baselines. Our results within 3+1 scheme include the exclusion curve of $\Delta m_{41}$ vs. $\theta_{14}$, and the adjustment of $\theta_{13}$ due to the contribution of $\theta_{14}$ to the disappearance of electron antineutrinos.