利用大亚湾完整数据集寻找亚电子伏特无中微子。

Search for a Sub-eV Sterile Neutrino Using Daya Bay's Full Dataset.

作者信息

An F P, Bai W D, Balantekin A B, Bishai M, Blyth S, Cao G F, Cao J, Chang J F, Chang Y, Chen H S, Chen H Y, Chen S M, Chen Y, Chen Y X, Chen Z Y, Cheng J, Cheng Y-C, Cheng Z K, Cherwinka J J, Chu M C, Cummings J P, Dalager O, Deng F S, Ding X Y, Ding Y Y, Diwan M V, Dohnal T, Dolzhikov D, Dove J, Dugas K V, Duyang H Y, Dwyer D A, Gallo J P, Gonchar M, Gong G H, Gong H, Gu W Q, Guo J Y, Guo L, Guo X H, Guo Y H, Guo Z, Hackenburg R W, Han Y, Hans S, He M, Heeger K M, Heng Y K, Hor Y K, Hsiung Y B, Hu B Z, Hu J R, Hu T, Hu Z J, Huang H X, Huang J H, Huang X T, Huang Y B, Huber P, Jaffe D E, Jen K L, Ji X L, Ji X P, Johnson R A, Jones D, Kang L, Kettell S H, Kohn S, Kramer M, Langford T J, Lee J, Lee J H C, Lei R T, Leitner R, Leung J K C, Li F, Li H L, Li J J, Li Q J, Li R H, Li S, Li S, Li S C, Li W D, Li X N, Li X Q, Li Y F, Li Z B, Liang H, Lin C J, Lin G L, Lin S, Ling J J, Link J M, Littenberg L, Littlejohn B R, Liu J C, Liu J L, Liu J X, Lu C, Lu H Q, Luk K B, Ma B Z, Ma X B, Ma X Y, Ma Y Q, Mandujano R C, Marshall C, McDonald K T, McKeown R D, Meng Y, Napolitano J, Naumov D, Naumova E, Nguyen T M T, Ochoa-Ricoux J P, Olshevskiy A, Park J, Patton S, Peng J C, Pun C S J, Qi F Z, Qi M, Qian X, Raper N, Ren J, Morales Reveco C, Rosero R, Roskovec B, Ruan X C, Russell B, Steiner H, Sun J L, Tmej T, Tse W-H, Tull C E, Tung Y C, Viren B, Vorobel V, Wang C H, Wang J, 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, Wei L H, Wei W, Wen L J, Whisnant K, White C G, Wong H L H, Worcester E, Wu D R, Wu Q, Wu W J, Xia D M, Xie Z Q, Xing Z Z, Xu H K, Xu J L, Xu T, Xue T, Yang C G, Yang L, Yang Y Z, Yao H F, Ye M, Yeh M, Young B L, Yu H Z, Yu Z Y, Yuan C Z, Yue B B, Zavadskyi V, Zeng S, Zeng Y, Zhan L, Zhang C, Zhang F Y, Zhang H H, Zhang J L, Zhang J W, Zhang Q M, Zhang S Q, Zhang X T, Zhang Y M, Zhang Y X, Zhang Y Y, Zhang Z J, Zhang Z P, Zhang Z Y, Zhao J, Zhao R Z, Zhou L, Zhuang H L, Zou J H

机构信息

<a href="https://ror.org/0064kty71">Sun Yat-Sen (Zhongshan) University</a>, Guangzhou.

University of Wisconsin, Madison, Wisconsin 53706.

出版信息

Phys Rev Lett. 2024 Aug 2;133(5):051801. doi: 10.1103/PhysRevLett.133.051801.

DOI:10.1103/PhysRevLett.133.051801

PMID:39159085

Abstract

This Letter presents results of a search for the mixing of a sub-eV sterile neutrino with three active neutrinos based on the full data sample of the Daya Bay Reactor Neutrino Experiment, collected during 3158 days of detector operation, which contains 5.55×10^{6} reactor ν[over ¯]{e} candidates identified as inverse beta-decay interactions followed by neutron capture on gadolinium. The analysis benefits from a doubling of the statistics of our previous result and from improvements of several important systematic uncertainties. No significant oscillation due to mixing of a sub-eV sterile neutrino with active neutrinos was found. Exclusion limits are set by both Feldman-Cousins and CLs methods. Light sterile neutrino mixing with sin^{2}2θ{14}≳0.01 can be excluded at 95% confidence level in the region of 0.01 eV^{2}≲|Δm_{41}^{2}|≲0.1 eV^{2}. This result represents the world-leading constraints in the region of 2×10^{-4} eV^{2}≲|Δm_{41}^{2}|≲0.2 eV^{2}.

摘要

本信函介绍了基于大亚湾反应堆中微子实验的完整数据样本，对亚电子伏特惰性中微子与三种活性中微子混合情况的搜索结果。该数据样本是在探测器运行的3158天内收集的，包含5.55×10⁶个反应堆反中微子候选事例，这些事例被识别为逆β衰变相互作用，随后是中子在钆上的俘获。本分析受益于统计量翻倍，相比我们之前的结果，以及几个重要系统不确定性的改进。未发现由于亚电子伏特惰性中微子与活性中微子混合而产生的显著振荡。排除限通过费尔德曼 - 考辛斯方法和CLs方法设定。在0.01 eV²≲|Δm₄₁²|≲0.1 eV²范围内，sin²2θ₁₄≳0.01的轻惰性中微子混合在95%置信水平下可被排除。该结果代表了在2×10⁻⁴ eV²≲|Δm₄₁²|≲0.2 eV²区域内世界领先的限制。