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arXiv 2007.14858hep-ex
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用ATLAS探测器在$\sqrt{s}$ =13 TeV的质子-质子碰撞中多轻子末态产生$t\bar{t}t\bar{t}$的证据

Evidence for $t\bar{t}t\bar{t}$ production in the multilepton final state in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

利用ATLAS探测器收集的质心能量为13 TeV的质子-质子碰撞数据的积分亮度为139 fb $^{-1}$,对四顶夸克的产生进行了研究.如果事件包含一个相同符号的轻子对或至少三个轻子(电子或μ子),则事件被选中。射流多样性,射流风味和事件运动学被用来分离信号从背景中通过多元判别,和专用的控制区域被用来约束占主导地位的背景。四顶夸克产生截面的测量值为24 $^{+7}_{-6}$ fb。这对应于观察到的(预期的)显著性,相对于4.3(2.4)标准差的仅背景假设,并为该过程提供了证据。

英文摘要:

A search is presented for four-top-quark production using an integrated luminosity of 139 fb$^{-1}$ of proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24$^{+7}_{-6}$ fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.

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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