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Overview on neutrinos and the Daya Bay experiment

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Abstract

Neutrinos are elementary particles in the Standard Model. Neutrino oscillation is a quantum mechanical phenomenon beyond the Standard Model. Neutrino oscillation can be described by two independent mass-squared differences Δm 221 , Δm 231 (or Δm 232 ) and a 3 × 3 unitary matrix, containing three mixing angles θ 12, θ 23, θ 13, and one charge-parity (CP) phase. θ 12 is about 34° and determined by solar neutrino experiments and the reactor neutrino experiment KamLAND. θ 23 is about 45° and determined by atmospheric neutrino experiments and accelerator neutrino experiments. θ 13 can be measured by either accelerator or reactor neutrino experiments. On Mar. 8, 2012, the Daya Bay Reactor Neutrino Experiment reported the first observation of non-zero θ 13 with 5.2 standard deviations. In June, with 2.5× previous data, Daya Bay improved the measurement of sin22θ 13 = 0.089 ± 0.010(stat) ± 0.005(syst).

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  1. Division for Experimental Physics, The Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Miao He

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  1. Miao He
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Correspondence to Miao He.

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He, M. Overview on neutrinos and the Daya Bay experiment. Front. Phys. 8, 242–247 (2013). https://doi.org/10.1007/s11467-013-0296-x

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