arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.06605hep-exhep-phnucl-exphysics.ins-det
收藏

基于T2K中微子计时测量的中微子质量上限

Upper bound on neutrino mass based on T2K neutrino timing measurements

T2K Collaboration

摘要:

东海到神冈(Tokai to Kamioka,T2 K)的长基线中微子实验包括一个由J-PARC加速器产生的μ子中微子束,一个近探测器复合体和一个295公里远的大型远探测器。目前的工作利用T2 K事件的时间测量在近和远探测器研究中微子的飞行时间作为衍生中微子能量的函数。在能量和飞行时间之间的相对论关系的假设下,可以推导出中微子静止质量的约束。亚GeV中微子束与几十ns量级的定时精度相结合,提供了在几MeV/ $c^2$范围内对中微子质量的灵敏度。我们研究了μ子和电子中微子候选事件在T2 K远探测器上的相对到达时间随中微子能量的分布。90% C. L。发现在数据样本中表示的中微子质量本征态的混合的上限是m $_ν^2 < 5.6 \, {\mathrm MeV^2/}c^4$。

英文摘要:

The Tokai to Kamioka (T2K) long-baseline neutrino experiment consists of a muon neutrino beam, produced at the J-PARC accelerator, a near detector complex and a large 295km distant far detector. The present work utilizes the T2K event timing measurements at the near and far detectors to study neutrino time of flight as function of derived neutrino energy. Under the assumption of a relativistic relation between energy and time of flight, constraints on the neutrino rest mass can be derived. The sub-GeV neutrino beam in conjunction with timing precision of order tens of ns provide sensitivity to neutrino mass in the few MeV/$c^2$ range. We study the distribution of relative arrival times of muon and electron neutrino candidate events at the T2K far detector as a function of neutrino energy. The 90% C.L. upper limit on the mixture of neutrino mass eigenstates represented in the data sample is found to be m$_ν^2 < 5.6 \, {\mathrm MeV^2/}c^4$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑