利用大亚湾实验的全配置改进对轻惰性中微子的搜索。

Improved Search for a Light Sterile Neutrino with the Full Configuration of the Daya Bay Experiment.

作者信息

An F P, Balantekin A B, Band H R, Bishai M, Blyth S, Cao D, Cao G F, Cao J, Cen W R, Chan Y L, Chang J F, Chang L C, Chang Y, Chen H S, Chen Q Y, Chen S M, Chen Y X, Chen Y, Cheng J-H, Cheng J, Cheng Y P, Cheng Z K, Cherwinka J J, Chu M C, Chukanov A, Cummings J P, de Arcos J, Deng Z Y, Ding X F, Ding Y Y, Diwan M V, Dolgareva M, Dove J, Dwyer D A, Edwards W R, Gill R, Gonchar M, Gong G H, Gong H, Grassi M, Gu W Q, Guan M Y, Guo L, Guo R P, Guo X H, Guo Z, Hackenburg R W, Han R, Hans S, He M, Heeger K M, Heng Y K, Higuera A, Hor Y K, Hsiung Y B, Hu B Z, Hu T, Hu W, Huang E C, Huang H X, Huang X T, Huber P, Huo W, Hussain G, Jaffe D E, Jaffke P, Jen K L, Jetter S, Ji X P, Ji X L, Jiao J B, Johnson R A, Joshi J, Kang L, Kettell S H, Kohn S, Kramer M, Kwan K K, Kwok M W, Kwok T, Langford T J, Lau K, Lebanowski L, Lee J, Lee J H C, Lei R T, Leitner R, Leung J K C, Li C, Li D J, Li F, Li G S, Li Q J, Li S, Li S C, Li W D, Li X N, Li Y F, Li Z B, Liang H, Lin C J, Lin G L, Lin S, Lin S K, Lin Y-C, Ling J J, Link J M, Littenberg L, Littlejohn B R, Liu D W, Liu J L, Liu J C, Loh C W, Lu C, Lu H Q, Lu J S, Luk K B, Lv Z, Ma Q M, Ma X Y, Ma X B, Ma Y Q, Malyshkin Y, Martinez Caicedo D A, McDonald K T, McKeown R D, Mitchell I, Mooney M, Nakajima Y, Napolitano J, Naumov D, Naumova E, Ngai H Y, Ning Z, Ochoa-Ricoux J P, Olshevskiy A, Pan H-R, Park J, Patton S, Pec V, Peng J C, Pinsky L, Pun C S J, Qi F Z, Qi M, Qian X, Raper N, Ren J, Rosero R, Roskovec B, Ruan X C, Steiner H, Sun G X, Sun J L, Tang W, Taychenachev D, Treskov K, Tsang K V, Tull C E, Viaux N, Viren B, Vorobel V, Wang C H, Wang M, Wang N Y, Wang R G, Wang W, Wang X, Wang Y F, Wang Z, Wang Z, Wang Z M, Wei H Y, Wen L J, Whisnant K, White C G, Whitehead L, Wise T, Wong H L H, Wong S C F, Worcester E, Wu C-H, Wu Q, Wu W J, Xia D M, Xia J K, Xing Z Z, Xu J Y, Xu J L, Xu Y, Xue T, Yang C G, Yang H, Yang L, Yang M S, Yang M T, Ye M, Ye Z, Yeh M, Young B L, Yu Z Y, Zeng S, Zhan L, Zhang C, Zhang H H, Zhang J W, Zhang Q M, Zhang X T, Zhang Y M, Zhang Y X, Zhang Y M, Zhang Z J, Zhang Z Y, Zhang Z P, Zhao J, Zhao Q W, Zhao Y B, Zhong W L, Zhou L, Zhou N, Zhuang H L, Zou J H

机构信息

Institute of Modern Physics, East China University of Science and Technology, Shanghai.

University of Wisconsin, Madison, Wisconsin USA.

出版信息

Phys Rev Lett. 2016 Oct 7;117(15):151802. doi: 10.1103/PhysRevLett.117.151802.

DOI:10.1103/PhysRevLett.117.151802

PMID:27768341

Abstract

This Letter reports an improved search for light sterile neutrino mixing in the electron antineutrino disappearance channel with the full configuration of the Daya Bay Reactor Neutrino Experiment. With an additional 404 days of data collected in eight antineutrino detectors, this search benefits from 3.6 times the statistics available to the previous publication, as well as from improvements in energy calibration and background reduction. A relative comparison of the rate and energy spectrum of reactor antineutrinos in the three experimental halls yields no evidence of sterile neutrino mixing in the 2×10^{-4}≲|Δm_{41}^{2}|≲0.3 eV^{2} mass range. The resulting limits on sin^{2}2θ_{14} are improved by approx imately a factor of 2 over previous results and constitute the most stringent constraints to date in the |Δm_{41}^{2}|≲0.2 eV^{2} region.

摘要

本信函报道了利用大亚湾反应堆中微子实验的完整配置，在电子反中微子消失通道中对轻惰性中微子混合进行的改进搜索。通过在八个反中微子探测器中额外收集404天的数据，此次搜索受益于比之前发表的数据多3.6倍的统计量，以及能量校准和本底降低方面的改进。对三个实验大厅中反应堆反中微子的速率和能谱进行的相对比较，在2×10⁻⁴≲|Δm₄₁²|≲0.3 eV²质量范围内未发现惰性中微子混合的证据。由此得到的sin²2θ₁₄的限制比之前的结果提高了约2倍，并且在|Δm₄₁²|≲0.2 eV²区域构成了迄今为止最严格的约束。