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arXiv 2405.19862hep-ex
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使用ATLAS探测器在13 TeV pp碰撞的轻子加喷注末态中寻找与轻夸克耦合的成对产生矢量型夸克

Search for pair-produced vector-like quarks coupling to light quarks in the lepton plus jets final state using 13 TeV $pp$ collisions with the ATLAS detector

ATLAS Collaboration

AI总结:

针对成对产生并衰变为W玻色子与轻夸克的重矢量型夸克,利用ATLAS探测器13 TeV pp碰撞数据,通过改进分析工具,在分支比为1时排除了质量低于1530 GeV的VLQs,较之前限制提升840 GeV。

摘要:

本文提出了对重矢量型夸克(VLQs)成对产生的搜索,每个VLQ衰变为W玻色子和轻夸克。本研究聚焦于一个W玻色子衰变为轻子、另一个衰变为强子的事件。搜索分析了ATLAS探测器在大型强子对撞机Run 2期间(2015至2018年)记录的140 fb⁻¹、质心能量√s=13 TeV的pp碰撞数据。末态特征为高横动量孤立电子或μ子、大横动量缺失、多个小半径喷注,以及一个被识别为来自增强W玻色子强子衰变的单个大半径喷注。与Run 1搜索相比,本分析具有更高的质心能量和积分亮度,且分析工具得到改进,在分支比ℬ(Q→Wq)=1时,95%置信水平下排除了质量低于1530 GeV的VLQs(Q),较之前的ATLAS限制提高了840 GeV。

英文摘要:

A search is presented for the pair-production of heavy vector-like quarks (VLQs) that each decay into a $W$ boson and a light quark. This study focuses on events where one $W$ boson decays into leptons and the other into hadrons. The search analyzed 140 fb$^{-1}$ of $pp$ collision data with $\sqrt{s} = 13$ TeV, recorded by the ATLAS detector from 2015 to 2018 during Run 2 of the Large Hadron Collider. The final state is characterized by a high-transverse-momentum isolated electron or muon, large missing transverse momentum, multiple small-radius jets, and a single large-radius jet identified as originating from the hadronic decay of a boosted $W$ boson. With higher center-of-mass energy and integrated luminosity than in the Run 1 search, and improved analysis tools, this analysis excludes VLQs ($Q$) with masses below 1530 GeV at 95% CL for the branching ratio ${{\cal B}(Q \to Wq)} = 1$, an improvement of 840 GeV on the previous ATLAS limit.

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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