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arXiv 1804.09568hep-ex
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使用ATLAS探测器寻找$Z$玻色子到$τ$轻子和轻轻子的违反轻子味衰变

Search for lepton-flavor-violating decays of the $Z$ boson into a $τ$ lepton and a light lepton with the ATLAS detector

ATLAS Collaboration

备注：
43 pages in total, author list starting page 27, 8 figures, 6 tables, published in Phys. Rev. D. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-36/
发表信息：
Phys. Rev. D 98, 092010 (2018)
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摘要：

本文介绍了在大型强子对撞机上用ATLAS探测器对$Z$玻色子衰变中轻子味破坏的直接研究。考虑了$Z$玻色子衰变为电子或μ子以及强子衰变的$τ$轻子。搜索基于ATLAS探测器在2015年和2016年收集的质子-质子碰撞数据样本，对应于36.1 fb $^{-1}$的积分光度，质心能量为$\sqrt{s} = 13$ TeV。没有观察到明显超过预期背景的事件，轻子味道违反衰变的分支比上限设定在95%的置信水平：$\mathcal{B} (Z\to eτ) < 5.8 \times 10^{-5}$和$\mathcal{B} (Z\to μτ) < 2.4 \times 10^{-5}$。这是使用ATLAS数据的$\mathcal{B} (Z\to eτ)$的第一个限制。将$\mathcal{B} (Z\to μτ)$的上限与先前基于在$\sqrt{s} = 8$ TeV的质心能量下质子-质子碰撞数据的20.3 fb $^{-1}$的ATLAS结果组合，并且在95%置信水平下的组合上限为$\mathcal{B} (Z\to μτ) < 1.3 \times 10^{-5}$。

英文摘要：

Direct searches for lepton flavor violation in decays of the $Z$ boson with the ATLAS detector at the LHC are presented. Decays of the $Z$ boson into an electron or a muon and a hadronically decaying $τ$ lepton are considered. The searches are based on a data sample of proton-proton collisions collected by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb$^{-1}$ at a center-of-mass energy of $\sqrt{s} = 13$ TeV. No significant excess of events above the expected background is observed, and upper limits on the branching ratios of lepton-flavor-violating decays are set at the 95% confidence level: $\mathcal{B} (Z\to eτ) < 5.8 \times 10^{-5}$ and $\mathcal{B} (Z\to μτ) < 2.4 \times 10^{-5}$. This is the first limit on $\mathcal{B} (Z\to eτ)$ with ATLAS data. The upper limit on $\mathcal{B} (Z\to μτ)$ is combined with a previous ATLAS result based on 20.3 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of $\sqrt{s} = 8$ TeV and the combined upper limit at 95% confidence level is $\mathcal{B} (Z\to μτ) < 1.3 \times 10^{-5}$.

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