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arXiv 2102.01444hep-ex
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用ATLAS探测器在$\sqrt{s} = 13$ TeV上寻找$pp$碰撞中带有两个相反电荷轻子、喷流和丢失横向动量的事件中的新现象

Search for new phenomena in events with two opposite-charge leptons, jets and missing transverse momentum in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

报告了在具有两个相反电荷轻子(电子或μ子),喷流和缺失横向动量的事件中搜索顶部方子的直接对产生和暗物质的结果,使用来自$\sqrt{s} = 13$ TeV质子-质子碰撞的139 fb $^{-1}$的积分亮度,由ATLAS探测器在大型强子对撞机运行2期间收集(2015-2018)。这种搜索考虑了对生产的顶夸克,是敏感的,在很大范围内的顶夸克和最轻的中性伴子之间的质量差异。此外,自旋0介质暗物质模型被认为是,在该介质中产生关联的一对顶夸克。介质随后衰变为一对暗物质粒子。未观察到显著超出标准模型背景的事件,限值设定为95%置信水平。结果排除顶夸克质量高达约1 TeV,和质量最轻的中性伴子高达约500 GeV。暗物质生产的限制设置为标量(赝标量)介质质量高达约250(300)GeV。

英文摘要:

The results of a search for direct pair production of top squarks and for dark matter in events with two opposite-charge leptons (electrons or muons), jets and missing transverse momentum are reported, using 139 fb$^{-1}$ of integrated luminosity from proton-proton collisions at $\sqrt{s} = 13$ TeV, collected by the ATLAS detector at the Large Hadron Collider during Run 2 (2015-2018). This search considers the pair production of top squarks and is sensitive across a wide range of mass differences between the top squark and the lightest neutralino. Additionally, spin-0 mediator dark-matter models are considered, in which the mediator is produced in association with a pair of top quarks. The mediator subsequently decays to a pair of dark-matter particles. No significant excess of events is observed above the Standard Model background, and limits are set at 95% confidence level. The results exclude top squark masses up to about 1 TeV, and masses of the lightest neutralino up to about 500 GeV. Limits on dark-matter production are set for scalar (pseudoscalar) mediator masses up to about 250 (300) GeV.

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