arXiv 2005.086942020-05hep-ex

在$\sqrt{s} =$ 13 TeV质子-质子碰撞中寻找增强$μμττ$末态的轻赝标希格斯玻色子

Search for a light pseudoscalar Higgs boson in the boosted $μμττ$ final state in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

备注：: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-18-024 (CMS Public Pages)
发表信息：: JHEP 08 (2020) 139
DOI：: 10.1007/JHEP08(2020)139

阅读 PDF

arXiv 页面 ↗HTML 原文 ↗

摘要：

使用2016年大型强子对撞机在$\sqrt{s} =$ 13 TeV下的质子-质子碰撞数据（对应于CMS实验收集的35.9 fb $^{-1}$的积分光度），从125 GeV（或更重的）标量希格斯玻色子玻色子（H）衰变而来的轻赝标量希格斯玻色子玻色子（a）进行搜索。分析认为胶子融合和矢量玻色子融合生产的H，其次是衰变H $\to$ aa $\to$ $μμττ$，并认为赝标量质量范围3.6 $\lt$ $m_\mathrm{a}$ $\lt$ 21 GeV。由于H玻色子和a玻色子之间的质量差很大，而a玻色子衰变产物的质量很小，因此$μμ$和PDMATHAMT对都有很高的洛伦兹提升，并且是准直的。通过修改用于强子$τ$轻子衰变重建的标准技术以考虑附近的μ子，提高了$ττ$重建效率。未观察到显著信号。对于H $\to$ aa $\to$ $μμττ$，将模型无关限值设定为95%置信水平，作为$m_\mathrm{a}$的函数，对于$m_\mathrm{H} =$ 125（300）GeV，将分支分数（$\mathcal{B}$）降至1.5（2.0）$\times$ 10 $^{-4}$。依赖于模型的限制$\mathcal{B}$（H $\to$ aa）的上下文中设置两个希格斯双态加单态模型，与最严格的结果获得类型III模型。这些结果扩展了目前大型强子对撞机寻找较重的a玻色子，衰变到解决轻子对，并提供了第一个这样的边界的H玻色子与质量超过125 GeV。

英文摘要：

A search for a light pseudoscalar Higgs boson (a) decaying from the 125 GeV (or a heavier) scalar Higgs boson (H) is performed using the 2016 LHC proton-proton collision data at $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$, collected by the CMS experiment. The analysis considers gluon fusion and vector boson fusion production of the H, followed by the decay H $\to$ aa $\to$ $μμττ$, and considers pseudoscalar masses in the range 3.6 $\lt$ $m_\mathrm{a}$ $\lt$ 21 GeV. Because of the large mass difference between the H and the a bosons and the small masses of the a boson decay products, both the $μμ$ and the $ττ$ pairs have high Lorentz boost and are collimated. The $ττ$ reconstruction efficiency is increased by modifying the standard technique for hadronic $τ$ lepton decay reconstruction to account for a nearby muon. No significant signal is observed. Model-independent limits are set at 95% confidence level, as a function of $m_\mathrm{a}$, on the branching fraction ($\mathcal{B}$) for H $\to$ aa $\to$ $μμττ$, down to 1.5 (2.0) $\times$ 10$^{-4}$ for $m_\mathrm{H} =$ 125 (300) GeV. Model-dependent limits on $\mathcal{B}$(H $\to$ aa) are set within the context of two Higgs doublets plus singlet models, with the most stringent results obtained for Type-III models. These results extend current LHC searches for heavier a bosons that decay to resolved lepton pairs and provide the first such bounds for an H boson with a mass above 125 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。

摘要：

英文摘要：

相关论文