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arXiv 2004.11537hep-phhep-ex
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HL-LHC上重中性轻子和$τ$ -中微子混合$|U_{τN}|^2 $的灵敏度范围

Sensitivity Reach on the Heavy Neutral Leptons and $τ$-Neutrino Mixing $|U_{τN}|^2 $ at the HL-LHC

Kingman Cheung, Yi-Lun Chung, Hiroyuki Ishida, Chih-Ting Lu

备注：
Published version
发表信息：
Phys. Rev. D 102, 075038 (2020)
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摘要：

从理论和唯象的角度来看，重中性轻子模型都是标准模型之外的一个很有意义的模型。它是解释微小中微子质量之谜和我们宇宙中物质-反物质不对称性起源的不可或缺的组成部分，基于最简单的I型跷跷板机制可以嵌入的模型。质量达到电弱尺度的HNL是一个有吸引力的场景，可以在当前或不久的将来的实验中进行测试，包括LHC。在本工作中，我们研究了HNL的衰变率，并找到了活跃中微子与HNL的混合角的敏感参数空间。由于$ ν_τ $和HNL之间的混合在文献中没有得到很好的建立相比，$ν_e$和$ν_μ$的质量在电弱标度的HNL，我们专注于通道$ pp\rightarrow W^{\pm(\ast)} + X\rightarrow τ^{\pm} N + X$在LHC 14 TeV的HNL搜索。目标签名由三个提示带电轻子，其中包括至少两个τ轻子。在信号-背景分析之后，我们进一步设定了高亮度LHC（HL-LHC）上混合$ |U_{τN}|^2 $和$ M_N $的灵敏度界限。我们预测HL-LHC的可检验边界可以比以前的LEP约束和电弱精度数据（EWPD）更强，特别是对于$ M_N \lesssim $ 50 GeV可以达到$ |U_{τN}|^2 \approx 2\times 10^{-6} $。

英文摘要：

The model of heavy neutral leptons (HNLs) is one of the well-motivated models beyond the standard model (BSM) from both theoretical and phenomenological point of views. It is an indispensable ingredient to explain the puzzle of tiny neutrino masses and the origin of the matter-antimatter asymmetry in our Universe, based on the models in which the simplest Type-I seesaw mechanism can be embedded. The HNL with a mass up to the electroweak scale is an attractive scenario which can be readily tested in present or near-future experiments including the LHC. In this work, we study the decay rates of HNLs and find the sensitive parameter space of the mixing angles between the active neutrinos and HNLs. Since the mixing between $ ν_τ $ and HNL is not well established in literature compared with those of $ν_e$ and $ν_μ$ for the HNL of mass in the electroweak scale, we focus on the channel $ pp\rightarrow W^{\pm(\ast)} + X\rightarrow τ^{\pm} N + X$ to search for HNLs at the LHC 14 TeV. The targeted signature consists of three prompt charged leptons, which include at least two tau leptons. After the signal-background analysis, we further set sensitivity bounds on the mixing $ |U_{τN}|^2 $ with $ M_N $ at High-Luminosity LHC (HL-LHC). We predict the testable bounds from HL-LHC can be stronger than the previous LEP constraints and Electroweak Precision Data (EWPD), especially for $ M_N \lesssim $ 50 GeV can reach down to $ |U_{τN}|^2 \approx 2\times 10^{-6} $.

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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