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arXiv 1405.6540hep-ph
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利用反应堆中微子实验约束无菌中微子

Constraining Sterile Neutrinos Using Reactor Neutrino Experiments

Ivan Girardi, Davide Meloni, Tommy Ohlsson, He Zhang, Shun Zhou

摘要:

根据最近的宇宙学数据,包含一个或多个无菌中微子的中微子混合模型已经恢复了它们的重要性。在这种情况下,反应堆反中微子实验提供了一个理想的地方来寻找无菌中微子的签名,因为它们对中微子味跃迁的影响。在这项工作中,我们表明,大亚湾实验的高精度数据约束的3+1中微子的情况下施加的上限的相关的活性-无菌混合角$\sin^2 2 θ_{14} \lesssim 0.06$在3 $σ$置信水平的质量平方差$Δm^2_{41}$范围$(10^{-3},10^{-1}) \, {\rm eV^2}$。后一个界限可以通过运行六年的JUNO实验$\sin^22θ_{14} \lesssim 0.016$来改进,尽管是在较小的质量范围$ Δm^2_{41} \in (10^{-4} ,10^{-3}) \, {\rm eV}^2$内。我们还研究了惰性中微子对标准中微子振荡参数$θ_{13}$和$Δm^2_{31}$(大亚湾和JUNO)、$θ_{12}$和$Δm^2_{21}$(JUNO)以及最重要的中微子质量等级(JUNO)的精确测量的影响。我们发现,除了$Δm^2_{41}\sim Δm^2_{31}$明显的情况下,无菌状态不会影响这些测量实质上。

英文摘要:

Models of neutrino mixing involving one or more sterile neutrinos have resurrected their importance in the light of recent cosmological data. In this case, reactor antineutrino experiments offer an ideal place to look for signatures of sterile neutrinos due to their impact on neutrino flavor transitions. In this work, we show that the high-precision data of the Daya Bay experi\-ment constrain the 3+1 neutrino scenario imposing upper bounds on the relevant active-sterile mixing angle $\sin^2 2 θ_{14} \lesssim 0.06$ at 3$σ$ confidence level for the mass-squared difference $Δm^2_{41}$ in the range $(10^{-3},10^{-1}) \, {\rm eV^2}$. The latter bound can be improved by six years of running of the JUNO experiment, $\sin^22θ_{14} \lesssim 0.016$, although in the smaller mass range $ Δm^2_{41} \in (10^{-4} ,10^{-3}) \, {\rm eV}^2$. We have also investigated the impact of sterile neutrinos on precision measurements of the standard neutrino oscillation parameters $θ_{13}$ and $Δm^2_{31}$ (at Daya Bay and JUNO), $θ_{12}$ and $Δm^2_{21}$ (at JUNO), and most importantly, the neutrino mass hierarchy (at JUNO). We find that, except for the obvious situation where $Δm^2_{41}\sim Δm^2_{31}$, sterile states do not affect these measurements substantially.

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。

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