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Precise Measurements of Oscillation Parameters $\Theta_{13}$ and $ \Delta m^2_{ee}$

Y. Guo, Q. Zhang, on behalf of the Daya Bay collaboration

in The 15th International Conference on Flavor Physics & CP Violation

Contribution: pdf


The precision of neutrino mixing angle $\theta$$_{13}$ is of key significance in constraining the leptonic CP phase and testing neutrino oscillation theory. $\theta$$_{13}$ is the smallest and the last known neutrino oscillation angle, and its precise measurements were reviewed in this paper. Its two typical measurement approaches, long-baseline accelerator neutrino experiment and short-baseline reactor neutrino experiment, are summarized. Then, their related typical experiments and the corresponding results were also overviewed. Daya Bay is the first experiment to exclude $\theta$$_{13}$=0 with a significance of more than 5 standard deviations and has given the most accurate measurement of sin$^{2}2$$\theta$$_{13}$ =0.0841±0.0027(stat.)±0.0019(syst.).In addition, |$\Delta$m$_{ee}^{2}$|=2.50±0.06 (stat.)± 0.06 (syst.)×10-3eV$^{2}$ has been also obtained in Daya Bay experiment, which is comparable with $\Delta$m$_{32}^{2}$ measured in long-baseline accelerator neutrino experiment.