Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in p p collisions at s = 13 TeV with the ATLAS detector
Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in p p collisions at s = 13 TeV with the ATLAS detector
复制标题
使用 ATLAS 探测器在 s = 13 TeV 的 p p 碰撞中搜索单轻子和相反符号双轻子最终状态中的四顶夸克产生
DOI：
10.1103/physrevd.99.052009
复制
发表时间：
2019
影响因子：
5
通讯作者：
Aaboud M
中科院分区：
文献类型：
--
作者：
Aaboud M
提出了一种寻找四顶夸克产生的方法。它是基于质子-质子碰撞数据，在2015年和2016年期间，ATLAS探测器在大型强子对撞机上收集了质心能量，对应于积分光度。数据进行了分析，在单轻子和相反的符号双轻子通道，其特征在于存在一个或两个孤立的电子或μ子与高横向动量和多个喷流。一个数据驱动的方法被用来估计占主导地位的背景顶夸克对生产与喷流。未观察到显著超出标准模型预期的情况。结合ATLAS合作组以前进行的同号双轻子和多轻子搜索结果，在95%置信水平下得到了四顶夸克标准模型截面的5.3（2.1）倍的观测（预期）上限.此外，在有效场论模型的背景下，反常的四顶夸克产生截面的上限。
A search for four-top-quark production,, is presented. It is based on proton-proton collision data with a center-of-mass energycollected by the ATLAS detector at the Large Hadron Collider during the years 2015 and 2016, corresponding to an integrated luminosity of. Data are analyzed in both the single-lepton and opposite-sign dilepton channels, characterized by the presence of one or two isolated electrons or muons with high-transverse momentum and multiple jets. A data-driven method is used to estimate the dominant background from top-quark pair production in association with jets. No significant excess above the Standard Model expectation is observed. The result is combined with the previous same-sign dilepton and multilepton searches carried out by the ATLAS Collaboration and an observed (expected) upper limit of 5.3 (2.1) times the four-top-quark Standard Model cross section is obtained at 95% confidence level. Additionally, an upper limit on the anomalous four-top-quark production cross section is set in the context of an effective field theory model.