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arXiv 2202.12988hep-ex
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在$\sqrt{s} =$ 13 TeV的全喷流终态中寻找衰变为类矢量夸克和顶夸克或底夸克的W'玻色子

Search for a W' boson decaying to a vector-like quark and a top or bottom quark in the all-jets final state at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

研究了重W'玻色子共振分别衰变为B或T矢量类夸克和t或b夸克的情况。分析是使用在LHC的CMS探测器收集的质子-质子碰撞进行的。这些数据对应于138 fb $^{-1}$的积分亮度,质心能量为13 TeV。两个衰变通道都产生了一个t夸克、一个希格斯玻色子或Z玻色子和一个b夸克的特征,每个都是由显著的洛伦兹推动产生的。利用喷注子结构技术减少标准模型背景,选择Higgs或Z玻色子和t夸克的全强子衰变,得到明显的三喷注W'玻色子衰变特征。未观察到数据相对于标准模型背景预测的显著偏差。上限设定为W'玻色子截面和最终状态分支分数的乘积的95%置信水平。考虑到民主分支分数的基准模型假设,质量低于3.1 TeV的W'玻色子被排除在外。此外,根据这些假设的一般化设定限制。这是迄今为止对这种最终状态最敏感的限制。

英文摘要:

A search is presented for a heavy W' boson resonance decaying to a B or T vector-like quark and a t or a b quark, respectively. The analysis is performed using proton-proton collisions collected with the CMS detector at the LHC. The data correspond to an integrated luminosity of 138 fb$^{-1}$ at a center-of-mass energy of 13 TeV. Both decay channels result in a signature with a t quark, a Higgs or Z boson, and a b quark, each produced with a significant Lorentz boost. The all-hadronic decays of the Higgs or Z boson and of the t quark are selected using jet substructure techniques to reduce standard model backgrounds, resulting in a distinct three-jet W' boson decay signature. No significant deviation in data with respect to the standard model background prediction is observed. Upper limits are set at 95% confidence level on the product of the W' boson cross section and the final state branching fraction. A W' boson with a mass below 3.1 TeV is excluded, given the benchmark model assumption of democratic branching fractions. In addition, limits are set based on generalizations of these assumptions. These are the most sensitive limits to date for this final state.

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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