论文标题
hl-lhc的重型中性瘦素和$τ$ -Neutrino混合$ | u_ {τn} |^2 $的敏感性达到
Sensitivity Reach on the Heavy Neutral Leptons and $τ$-Neutrino Mixing $|U_{τN}|^2 $ at the HL-LHC
论文作者
论文摘要
从理论和现象学观点的观点点，重型中性瘦素（HNLS）的模型是超出标准模型（BSM）的良好动机模型之一。基于可以嵌入最简单的类型I SeeSaw机制的模型，它可以解释微小中微子肿块的难题和物质抗逆性不对称性的根源是必不可少的成分。具有质量到电动量表的HNL是一个有吸引力的场景，可以在包括LHC在内的当前或近乎未来的实验中进行测试。在这项工作中，我们研究了HNL的衰减速率，并找到了活性中微子和HNL之间混合角的敏感参数空间。由于与$ν_τ$和hnl之间的混合在文献中没有很好地确定，与$ν_e$和$ν_μ$相比，在electroweak量表中，质量质量的质量是$ν_μ$，因此我们专注于$ pp \ rightarrow w^{\ pm pm（\ ast pm（\ ast）} + x \ forearrow pm pm pm for hn TEV。目标签名由三个迅速带电的瘦素组成，其中至少包括两个tau瘦素。在信号背景分析之后，我们进一步在混合$ | u_ {τn} |^2 $与$ m_n $的混合上设置了灵敏度界限。我们预测HL-LHC的可测试界限可能更强，而LEP约束和Electroweak Precision数据（EWPD），尤其是对于$ M_N \ Lessim $ 50 GEV可以达到$ | U_ {τn} |^2 |^2 \^2 \ times 10^{ - 6} $。
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} $.
