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arXiv 2405.05071hep-ex
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在√s = 13 TeV的pp碰撞全强子末态中寻找衰变至tH或tZ的单个类矢量夸克产生

Search for production of a single vector-like quark decaying to tH or tZ in the all-hadronic final state in pp collisions at $\sqrt{s}$ = 13 TeV

CMS Collaboration

AI总结:

本研究利用CMS在13 TeV、138 fb⁻¹数据中的全强子末态寻找伴随b夸克产生并衰变到tH或tZ的单个类矢量T夸克,未发现偏离标准模型,并给出600–1200 GeV质量区间的95%置信水平截面上限。

摘要:

本文介绍了在全强子衰变通道中寻找单个类矢量T夸克与一个底(b)夸克伴随电弱产生的研究。该搜索使用CERN LHC上CMS实验在2016至2018年间收集的、质心系能量√s = 13 TeV的质子-质子碰撞数据,对应积分亮度为138 fb⁻¹。假设T夸克电荷为2/3,并衰变至一个顶(t)夸克和一个Higgs(H)或Z玻色子。t夸克以及H或Z玻色子的强子衰变,依据喷注(包括含b强子的喷注)的运动学性质进行重建。在重建的tH和tZ不变质量分布中,未观察到偏离标准模型预测的现象。对于质量为600–1200 GeV的T夸克,与b夸克伴随产生并通过tH或tZ衰变的T夸克,其产生截面与分支比乘积的95%置信水平上限范围为1260至68 fb。

英文摘要:

A search for electroweak production of a single vector-like T quark in association with a bottom (b) quark in the all-hadronic decay channel is presented. This search uses proton-proton collision data at $\sqrt{s}$ = 13 TeV collected by the CMS experiment at the CERN LHC during 2016-2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The T quark is assumed to have charge 2/3 and decay to a top (t) quark and a Higgs (H) or Z boson. Hadronic decays of the t quark and the H or Z boson are reconstructed from the kinematic properties of jets, including those containing b hadrons. No deviation from the standard model prediction is observed in the reconstructed tH and tZ invariant mass distributions. The 95% confidence level upper limits on the product of the production cross section and branching fraction of a T quark produced in association with a b quark and decaying via tH or tZ range from 1260 to 68 fb for T quark masses of 600-1200 GeV.

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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