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arXiv 2402.01248hep-ph
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在14 TeV LHC上电荷为5/3的矢量like夸克的单产生

Single production of vectorlike quarks with charge 5/3 at the 14 TeV LHC

Yao-Bei Liu, Bo Hu, Chao-Zheng Li

AI总结:

本文研究了在14 TeV LHC上通过矢量like夸克X(电荷5/3)与第一、三代夸克耦合实现的单产生,并在同号双轻子加b喷注加缺失能量末态中给出300和3000 fb$^{-1}$亮度下的95% CL排除限与5σ发现灵敏度。

摘要:

矢量like夸克已在许多超出标准模型(SM)的新物理场景中被预言,它们可以与第一代夸克具有可观的耦合,而不与当前实验限制相冲突。在标准模型简单扩展为一个SU(2)二重态 $\left(X,T\right)$ 的框架下,其中包含一个矢量like夸克 $X$(VLQ-$X$),其电荷为 $|Q_{X}| = 5/3$,我们研究了在大型强子对撞机(LHC)Run-III和高亮度LHC(HL-LHC)以 $\sqrt{s}=14$ TeV 运行时,由VLQ-$X$与第一代和第三代夸克之间的耦合所诱导的VLQ-$X$单产生。信号在包含同号双轻子(电子或μ子)、一个$b$标记喷注和丢失能量的事件中进行搜索,其中假设X夸克衰变为一个顶夸克和一个W玻色子,二者均发生轻子衰变。在对信号和本底事件进行快速模拟后,分别在积分亮度为300 fb$^{-1}$和3000 fb$^{-1}$的14 TeV LHC上获得了95%置信水平(CL)的排除限和$5σ$发现灵敏度。

英文摘要:

Vectorlike quarks have been predicted in many new physics scenarios beyond the Standard Model (SM), which can have sizable couplings to first generation quarks without conflicting with current experimental constraints. In a framework of the SM simply extended by an SU(2) doublet $\left(X,T\right)$ including a vectorlike quark $X$~(VLQ-$X$), with electric charge $|Q_{X}| = 5/3$, we investigate the single production of the VLQ-$X$ induced by the couplings between the VLQ-$X$ with the first and the third generation quarks at the Large Hadron Collider (LHC) Run-III and High-Luminosity LHC (HL-LHC) operating at $\sqrt{s}=14$~TeV. The signal is searched in events including same-sign dileptons (electrons or muons), one $b$-tagged jet and missing energy, where the X quark is assumed to decay into a top quark and a W boson, both decaying leptonically. After a rapid simulation of signal and background events, the 95\% CL exclusion limits and the $5σ$ discovery reach are respectively obtained at the 14 TeV LHC with an integrated luminosity of 300 and 3000 fb$^{-1}$, respectively.

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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