Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector
Search for pair-produced vector-like top and bottom partners in events with large missing transverse momentum in pp collisions with the ATLAS detector
复制标题
在与 ATLAS 探测器发生 pp 碰撞时，在具有大量缺失横向动量的事件中搜索成对产生的类矢量顶部和底部伙伴
DOI：
10.1140/epjc/s10052-023-11790-7
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Abusleme Hoffman, A. C.
中科院分区：
文献类型：
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作者：
Aad, G.;Abbott, B.;Abbott, D. C.;Abeling, K.;Abidi, S. H.;Aboulhorma, A.;Abramowicz, H.;Abreu, H.;Abulaiti, Y.;Abusleme Hoffman, A. C.
本文提出了一种利用恰好有一个轻子（eor）、至少有四个喷注（包括至少一个b标记喷注）和大的缺失横动量的事件来寻找成对产生的矢量类夸克的方法。分析了2015年至2018年由ATLAS探测器在LHC记录的质心能量为13的质子-质子碰撞数据，对应于139 fb的积分光度。我们考虑了顶夸克和底夸克的类矢量伙伴T和B，以及带电荷的类矢量X，假设它们衰变为W、Z或希格斯玻色子和第三代夸克。未观察到与标准模型预期的显著偏离。在不同的衰变分支比情况下，导出了T和B夸克对产生截面随质量变化的上限。假设质量简并的类矢量夸克和分支比对应于弱同位旋偶线模型，则质量的最强下限为1.59，而对于排斥衰变（），质量的最强下限为1.47（1.46）。此外，对于所有可能的分支比，导出了T夸克和B夸克质量的下限。
A search for pair-produced vector-like quarks using events with exactly one lepton (eor), at least four jets including at least oneb-tagged jet, and large missing transverse momentum is presented. Data from proton–proton collisions at a centre-of-mass energy of13, recorded by the ATLAS detector at the LHC from 2015 to 2018 and corresponding to an integrated luminosity of 139 fb, are analysed. Vector-like partnersTandBof the top and bottom quarks are considered, as is a vector-likeXwith charge, assuming their decay into aW,Z, or Higgs boson and a third-generation quark. No significant deviations from the Standard Model expectation are observed. Upper limits on the production cross-section ofTandBquark pairs as a function of their mass are derived for various decay branching ratio scenarios. The strongest lower limits on the masses are 1.59assuming mass-degenerate vector-like quarks and branching ratios corresponding to the weak-isospin doublet model, and 1.47(1.46) for exclusive() decays. In addition, lower limits on theTandBquark masses are derived for all possible branching ratios.