Reactor Neutrino Experiments: $θ_{13}$ and Beyond

We review the current-generation short-baseline reactor neutrino experiments that have firmly established the third neutrino mixing angle $θ_{13}$ to be non-zero. The relative large value of $θ_{13}$ (around 9$^\circ$) has opened many new and exciting opportunities for future neutrino experiments. Daya Bay experiment with the first measurement of $Δm^2_{ee}$ is aiming for a precision measurement of this atmospheric mass-squared splitting with a comparable precision as $Δm^2_{μμ}$ from accelerator muon neutrino experiments. JUNO, a next-generation reactor neutrino experiment, is targeting to determine the neutrino mass hierarchy with medium baselines ($\sim$50 km). Beside these {\color{black} opportunities enabled by the large $θ_{13}$}, the current-generation (Daya Bay, Double Chooz, and RENO) and the next-generation (JUNO, RENO-50, and PROSPECT) reactor experiments, with their unprecedented statistics, are also leading the precision era of the 3-flavor neutrino oscillation physics as well as constraining new physics beyond the neutrino Standard Model.

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