Overview on neutrinos and the Daya Bay experiment

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• 作者：Miao He (1)
  
• 关键词：neutrino oscillation ; neutrino mixing ; Daya Bay
• 刊名：Frontiers of Physics
• 出版年：2013
• 出版时间：June 2013
• 年：2013
• 卷：8
• 期：3
• 页码：242-247
• 全文大小：309KB
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• 作者单位：Miao He (1)
  
  1. Division for Experimental Physics, The Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
  
• ISSN：2095-0470

文摘

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 螖m 21 2 , 螖m 31 2 (or 螖m 32 2 ) and a 3 脳 3 unitary matrix, containing three mixing angles 胃 12, 胃 23, 胃 13, and one charge-parity (CP) phase. 胃 12 is about 34掳 and determined by solar neutrino experiments and the reactor neutrino experiment KamLAND. 胃 23 is about 45掳 and determined by atmospheric neutrino experiments and accelerator neutrino experiments. 胃 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 胃 13 with 5.2 standard deviations. In June, with 2.5脳 previous data, Daya Bay improved the measurement of sin22胃 13 = 0.089 卤 0.010(stat) 卤 0.005(syst).