论文标题
$ t \ bar {t} t \ bar {t} $生产在Multilepton最终状态中的Proton-Proton碰撞中的$ \ sqrt {s} $ = 13 TEV与Atlas检测器
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
论文作者
论文摘要
搜索使用质子 - 普罗顿碰撞数据的139 fb $^{ - 1} $的集成亮度在LHC上收集的Atlas检测器收集的13个TEV的质子质量能量。如果事件包含相同的轻子对或至少三个Lepton（电子或MUON），则选择事件。 Jet多样性，喷气味和事件运动学用于通过多元判别物将信号与背景区分开，专用控制区用于限制主要背景。四顶夸克生产横截面的测量为24 $^{+7} _ { - 6} $ fb。这对应于仅背景假设的4.3（2.4）标准偏差的观察到的（预期）意义，并为此过程提供了证据。
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.
