arXiv 1602.075192016-02hep-phhep-ex

类矢量轻子模型中LFV Higgs衰变的边界及在LHC上寻找双电荷轻子

Bounds on LFV Higgs decays in a vector-like lepton model and searching for doubly charged leptons at the LHC

Chuan-Hung Chen, Takaaki Nomura

备注：: 16 pages, 3 figures, 1 table, version published in EPJC
DOI：: 10.1140/epjc/s10052-016-4197-3

摘要：

在类矢量轻子模型中研究了Higgs-门轻子味破坏。为了避开稀有$Z\to \ell^\pm_i \ell^\mp_j$衰变的限制，我们引入了两个三重态类矢量轻子：$(1,3)_{-1}$和$(1,3)_{0}$ .当应用来自不可见的$Z$衰减的约束时，$h\to μτ$的所得分支比可以高达$10^{-4}$。结果，$ττ$通道的信号强度与标准模型预测有$12\%$偏差，而μ子$g-2$比数据小两个数量级，而$BR(τ\to μγ)$是$10^{-12}$的数量级。分析了在$\sqrt{s}=13$ TeV的$pp$碰撞中预测的双电荷轻子，发现有趣的产生通道是$pp\to (Ψ^{--}_{1} Ψ^{++}_1, Ψ^{\pm\pm}_1 Ψ^\mp_1)$ . $Ψ^{++}_1$的单个和成对产生横截面是相当的，并且可以是几百fb。双电荷轻子的主要衰变道是$Ψ^{\pm\pm} \to \ell^\pm W^\pm$，而重的单电荷轻子的主要衰变道是$Ψ^\pm_1 \to νW^\pm, \ell^\pm Z$。在$13$ TeV大型强子对撞机上，用$100$ fb $^{-1}$光度进行了数值分析.

英文摘要：

The Higgs-portal lepton flavor violation is studied in a vectorlike lepton model. For evading the constraints from rare $Z\to \ell^\pm_i \ell^\mp_j$ decays, we introduce two triplet vectorlike leptons, $(1,3)_{-1}$ and $(1,3)_{0}$. The resultant branching ratio for $h\to μτ$ can be up to $10^{-4}$ when the constraints from the invisible $Z$ decays are applied. As a result, the signal strength for $ττ$ channel has a $12\%$ deviation from the standard model prediction, while the muon $g-2$ is two-order of magnitude smaller than the data and $BR(τ\to μγ)$ is of order of $10^{-12}$. A predicted doubly charged lepton in $pp$ collisions at $\sqrt{s}=13$ TeV is analyzed and it is found that the interesting production channels are $pp\to (Ψ^{--}_{1} Ψ^{++}_1, Ψ^{\pm\pm}_1 Ψ^\mp_1)$. Both single and pair production cross sections of $Ψ^{++}_1$ are comparable and can be a few hundred fb. The main decay channels for the doubly charged lepton are $Ψ^{\pm\pm} \to \ell^\pm W^\pm$ and for the heavy singly charged lepton are $Ψ^\pm_1 \to νW^\pm, \ell^\pm Z$. The numerical analysis is given at $13$ TeV LHC with $100$ fb$^{-1}$ luminosity.

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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英文摘要：

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