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arXiv 1807.11883hep-ex
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用ATLAS探测器在$\sqrt{s}= 13$ TeV上寻找PDMATHAAB碰撞中具有同电荷轻子和$b$ -喷流的事件中的新现象

Search for new phenomena in events with same-charge leptons and $b$-jets in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

本文报道了在大型强子对撞机ATLAS探测器记录的36.1 fb $^{-1}$的$\sqrt{s}= 13$ TeV的$pp$碰撞数据样本中,寻找两个同电荷轻子或三个同电荷轻子和喷流事件中的新现象,这些事件被确定为源自$b$ -夸克。没有发现明显的过剩,并限制了矢量类夸克,四顶夸克和同号顶夸克对的产生。观察到的(预期的)类矢量$T$ -和$B$ -夸克单线态的95% CL质量极限分别为$m_T > 0.98$ $(0.99)$ TeV和$m_B > 1.00$ $(1.01)$ TeV。考虑到对夸克和单夸克的产生,也导出了矢量状$T_{5/3}$ -夸克产生的极限;在前一种情况下,$T_{5/3}$ -夸克质量的下限为(预计为)1.19(1.21)TeV。标准模型四顶夸克产生截面的上限是(预计)69(29)fb。约束也设置在异国情调的四顶夸克生产模型。最后,限制了同号顶夸克对的产生。$uu \to tt$生产的上限是(预计)89(59)fb的介质质量为1 TeV,和暗物质的解释也来自,不包括3 TeV的介质与暗扇区耦合为1.0和耦合到普通物质以上0.31。

英文摘要:

A search for new phenomena in events with two same-charge leptons or three leptons and jets identified as originating from $b$-quarks in a data sample of 36.1 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}= 13$ TeV recorded by the ATLAS detector at the Large Hadron Collider is reported. No significant excess is found and limits are set on vector-like quark, four-top-quark, and same-sign top-quark pair production. The observed (expected) 95% CL mass limits for a vector-like $T$- and $B$-quark singlet are $m_T > 0.98$ $(0.99)$ TeV and $m_B > 1.00$ $(1.01)$ TeV respectively. Limits on the production of the vector-like $T_{5/3}$-quark are also derived considering both pair and single production; in the former case the lower limit on the mass of the $T_{5/3}$-quark is (expected to be) 1.19 (1.21) TeV. The Standard Model four-top-quark production cross-section upper limit is (expected to be) 69 (29) fb. Constraints are also set on exotic four-top-quark production models. Finally, limits are set on same-sign top-quark pair production. The upper limit on $uu \to tt$ production is (expected to be) 89 (59) fb for a mediator mass of 1 TeV, and a dark-matter interpretation is also derived, excluding a mediator of 3 TeV with a dark-sector coupling of 1.0 and a coupling to ordinary matter above 0.31.

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