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arXiv 1908.01115hep-ex
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在质子-质子碰撞中搜索衰变为顶夸克对的重希格斯玻色子($\sqrt{s} =$ 13 TeV)

Search for heavy Higgs bosons decaying to a top quark pair in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

AI总结:

本文利用CMS实验35.9 fb$^{-1}$数据,在13 TeV质子-质子碰撞中搜索衰变为顶夸克对的额外希格斯玻色子,观察到质量400 GeV处1.9σ的偏离,并报告了耦合强度约束及MSSM参数排除结果。

摘要:

本文展示了在质心能量为13 TeV的质子-质子碰撞中,搜索衰变为顶夸克对的额外标量(H)或赝标量(A)希格斯玻色子的结果。所分析的数据集对应于LHC上的CMS实验收集的35.9 fb$^{-1}$积分亮度。研究考虑了包含一个或两个带电轻子的末态。利用重建顶夸克对系统的不变质量以及对衰变为顶夸克对的粒子自旋敏感的变量,来搜索H或A玻色子的特征。研究中考虑了与标准模型顶夸克对背景的干涉。观察到一个中等程度的类信号偏离,与质量为400 GeV的A玻色子相符,其全局显著性为1.9个标准差。本文报告了关于这些假想玻色子与顶夸克耦合强度的新的严格约束,玻色子质量范围从400到750 GeV,总相对宽度从0.5%到25%。搜索结果还在最小超对称标准模型场景中进行了解释。探测了从400到700 GeV的$m_\mathrm{A}$值,并在95%置信水平下排除了$tanβ$值低于1.0到1.5(取决于$m_\mathrm{A}$)的区域。

英文摘要:

A search is presented for additional scalar (H) or pseudoscalar (A) Higgs bosons decaying to a top quark pair in proton-proton collisions at a center-of-mass energy of 13 TeV. The data set analyzed corresponds to an integrated luminosity of 35.9 fb$^{-1}$ collected by the CMS experiment at the LHC. Final states with one or two charged leptons are considered. The invariant mass of the reconstructed top quark pair system and variables that are sensitive to the spin of the particles decaying into the top quark pair are used to search for signatures of the H or A bosons. The interference with the standard model top quark pair background is taken into account. A moderate signal-like deviation compatible with an A boson with a mass of 400 GeV is observed with a global significance of 1.9 standard deviations. New stringent constraints are reported on the strength of the coupling of the hypothetical bosons to the top quark, with the mass of the bosons ranging from 400 to 750 GeV and their total relative width from 0.5 to 25%. The results of the search are also interpreted in a minimal supersymmetric standard model scenario. Values of $m_\mathrm{A}$ from 400 to 700 GeV are probed, and a region with values of $\tanβ$ below 1.0 to 1.5, depending on $m_\mathrm{A}$, is excluded at 95% confidence level.

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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