Review of Recent Neutrino Oscillation Results

Neutrino oscillations can be parameterized in terms of four parameters called $\theta_{12}$, $\theta_{23}$, $\theta _{13}$ and $\delta_{\mathrm{CP}}$. Non-zero values of the angles $\theta_{13}$ and $\delta_{\mathrm{CP}}$ could explain the profound mystery of why the observable universe only has matter and little anti-matter. Until recently only weak limits existed on $\theta _{13}$ and nothing was known about $\delta _{\mathrm{CP}}$. But in the last two years there has been a dramatic improvement in our understanding of $\theta_{13}$. This comes from neutrino oscillation results from the long baseline experiment T2K in Tokai, Japan, which observes the neutrino appearance mode $\nu _{\mathrm{\mu }} \to \nu_{\mathrm{e}}$ and from reactor experiments, Daya Bay, Double CHOOZ, and RENO, which measure the neutrino disappearance oscillation mode $\nu_{\mathrm{e}}\to \nu_{\mathrm{e}}$ in reactors operating in China, France, and Korea, respectively. These results now provide compelling evidence that $\theta_{13}$ is about 9 degrees. In this talk, the puzzling neutrino properties and the theory of neutrino oscillation mixing will be briefly introduced. These new experimental results will be reviewed and their impact on neutrino physics will be discussed.