Improved measurement of electron antineutrino disappearance at Daya Bay

Fengpeng An ,K Lau,C J Lin,L Whitehead,Y Chen,Y X Chen,S H Zhang,X N Li,R G Wang,T Xue,V Vorobel,Y X Zhang,M C Chu,R Carr,D W Liu,J Zhao,X L Ji,S M Chen,R A Johnson,Y Meng,K B Luk,J P Cummings,N Y Wang,Z M Wang,L Littenberg,J C Liu,Y C Tung,J C Peng,Z Y Zhang,H Y Chen,M Yeh,J L Liu,Y Torun,Y B Liu,D E Jaffe,S Patton,Y S Yeh,R Rosero,C S J Pun,T Kwok,H Steiner,X Q Li,Y C Zhang,H L H Wong,W T Chan,Z Wang,J W Zhang,X S Chen,Z Y Zhou,M Ye,X C Chen,C Y Lai,X Qian,M Gonchar,W K Ngai,C Zhang,W Wang,Y Xu,R L Hahn,X H Chen,S Blyth,J P Ochoa-Ricoux,Q M Zhang,X C Ruan,X B Li,G S Li,Z Z Xing,Y H Zhang,D Naumov,W D Li,L Pinsky,Z J Zhang,Q Wu,L S Wang,I Nemchenok,M Wang,F H Zhang,Z Y Yu,C A Lewis,L Z Wang,S D Fang,L Y Wang,Y C Lin,Y F Wang,X Wang,X F Du,R Leitner,J Lee,W Beriguete,Z B Li,C H Wang,Z P Zhang,Kirk T Mcdonald ,Z Ning,C E Tull,W Gu ,Y K Heng,H R Band,Y Q ,L Lebanowski,R L Gill,Y Li,X Y ,Yao Nie ,Z Y Deng,J Fu ,D.m Webber ,S Trentalange,B Roskovec,Yue Zhao ,L Wen ,M Krämer ,Beibei Shao ,R Tsang ,K K Kwan,M He,H Wei ,T Hu,Xi Jin ,Q He,Y H Tam,J B Jiao,X T Huang,N Raper,H L Zhuang,F Z Qi,Y Gornushkin ,Jie Ren ,Yayun Ding ,Yasuhiro Nakajima ,J J Cherwinka,Liang Zhan ,Bei-Zhen Hu ,M V Diwan,A G Olshevski ,O D Tsai ,K V Tsang,Q Zhao ,Liangquan Ge ,X B ,Lei Zheng ,C Chasman,Changgen Yang ,Vadim Issakov ,Guey-Lin Lin ,Q M ,Q An,D Mohapatra,X Ji ,W Lai ,L E Piilonen,Guanghua Gong ,Jing Xu ,D A Dwyer ,W R Edwards,H Y Ngai,S Ely ,J K C Leung,A Luk,Kendrick Co Shih ,C Lü ,E Worcester ,G F Cao,P Hinrichs,Z Fu ,H Z Huang,N Tagg,J F Chang,Xiao Tang ,S H Kettell,Jiajie Ling ,Hanxiong Huang ,Y Hsiung ,Y K Hor,Kwong-Sak Leung ,Yadong Wei ,Lei Yang ,Q J Li,Weili Zhong ,S Hans,S Lin ,Mengyun Guan ,T Wise,J Z Bai,Patrick Huber ,S Jetter,J M Link,Fenfang Wu ,M W Kwok,H Themann,R D Mckeown,C White ,K M Heeger,J Napolitano,Hao Jiang ,Hiroyuki Tanaka ,G X Sun,R Hackenburg ,S J Chen,F Li,Z Isvan,Jun Cao ,Ruiting Lei ,H Liang,Richard Brown ,M Bishai,B Viren,H Gong,A B Balantekin,Wanchang Lai ,B R Littlejohn,Ben Young ,Yun Hsuan Chang ,Kang Li ,K Whisnant,Hao Huang ,Y Williamson,Xin-Heng Guo ,E Draeger,H S Chen,Haoqi Lu ,Dongmei Xia ,Zhou Li ,Jian Sun ,M Qi,V Pec,M C Mcfarlane,J H Zou

doi:10.1088/1674-1137/37/1/011001

Abstract

We report an improved measurement of the neutrino mixing angle θ13 from the Daya Bay Reactor Neutrino Experiment. We exclude a zero value for sin22θ13 with a significance of 7.7 standard deviations. Electron antineutrinos from six reactors of 2.9 GWth were detected in six antineutrino detectors deployed in two near (flux-weighted baselines of 470 m and 576 m) and one far (1648 m) underground experimental halls. Using 139 days of data, 28909 (205308) electron antineutrino candidates were detected at the far hall (near halls). The ratio of the observed to the expected number of antineutrinos assuming no oscillations at the far hall is 0.944±0.007(stat.)±0.003(syst.). An analysis of the relative rates in six detectors finds sin22θ13=0.089±0.010(stat.)±0.005(syst.) in a three-neutrino framework.

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