Overview on neutrinos and the Daya Bay experiment

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 di.erences \mathrm{\Delta }{m}_{21}^2, \mathrm{\Delta }{m}_{31}^2 (or \mathrm{\Delta }{m}_{32}^2) and a3×3 unitary matrix, containing three mixing angles θ₁₂, θ₂₃, θ₁₃, and one charge-parity (CP) phase. θ₁₂ is about 34° and determined by solar neutrino experiments and the reactor neutrino experiment KamLAND. θ₂₃ is about 45° and determined by atmospheric neutrino experiments and accelerator neutrino experiments. θ₁₃ can be measured by either accelerator or reactor neutrino experiments. On Mar. 8, 2012, the Daya Bay Reactor Neutrino Experiment reported the .rst observation of non-zero θ₁₃ with 5.2 standard deviations. In June, with 2.5× previous data, Daya Bay improved the measurement of sin² 2 θ₁₃ = 0.089±0.010(stat)±0.005(syst).

Keywords

neutrino oscillation / neutrino mixing / Daya Bay

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