Latest results from Daya Bay Reactor Antineutrino Experiment and the Unified analysis on the neutrino mixing angle θ₁₃

Bei-Zhen Hu^1*, Yee Bob Hsiung¹, Hsiao-Ru Pan¹, Po-An Chen¹, Guey-Lin Lin², Kuo-Lun Jen², Chung-Hsiang Wang³

¹Physics Department, National Taiwan University, Taipei, Taiwan
²Institute of Physics, National Chiao Tung University, Hsinchu, Taiwan
³Department of Electro-Optical Engineering, National United University, Miaoli, Taiwan

* Presenter:Bei-Zhen Hu, email:ptbei1985@gmail.com

The Daya Bay Reactor Neutrino Experiment consists of eight functionally identical detectors placed underground at different baselines from six 2.9 GW reactor cores.
Anti-neutrinos signals are determined by the coincidence of the prompt signal from the e+ e- annihilation and delayed neutron captured signals. The primary result from Daya Bay experiment is using neutron capture on Gadolinium (nGd) for the delayed coincident signal. In 2012, the experiment announced the discovery of a non-zero value of sin²2θ₁₃ with a significance better than 5σ, based on a dataset collected with six antineutrino detectors. In the summer of 2012, two additional detectors were installed and several million-inverse beta decay (IBD) candidates have been collected since. With the largest sample of reactor antineutrinos ever collected to date, less backgrounds and better control of systematics, the measurement of the neutrino mixing angle θ₁₃ has now reached an unprecedented precision below 4%. The experiment also published θ₁₃ results with neutron captured on Hydrogen (nH) and the results are consistence.
It is possible to measure neutrino mixing angle θ₁₃ with both nH and nGd signals simultaneously. In this talk, I will cover the latest oscillation analysis results and the current analysis with both nH and nGd signals.

Keywords: mixing angle θ₁₃, neutrino oscillation , Daya Bay