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希格斯玻色子奇异衰变至一对赝标量的$μμ$bb和$ττ$bb末态寻找

Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the $μμ$bb and $ττ$bb final states

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-22-007 (CMS Public Pages)
发表信息：
Eur. Phys. J. C 84 (2024) 493
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AI总结：

本研究利用CMS探测器的138 fb$^{-1}$质子-质子碰撞数据，寻找125 GeV希格斯玻色子奇异衰变至一对轻赝标量的过程，设定了相关衰变分支比的95%置信水平上限，并在2HDM+S模型框架下排除了部分参数空间。

摘要：

本研究针对质量为125 GeV的希格斯玻色子（H）奇异衰变至一对轻赝标量$\u2006\mathrm{a}_1$的过程开展寻找，分析的末态中一个赝标量衰变至两个b夸克，另一个衰变至一对μ子或$τ$轻子。研究分析了由CMS探测器记录的质心系能量$\u2006\sqrt{s}$ = 13 TeV的质子-质子碰撞数据样本，对应的积分亮度为138 fb$^{-1}$。分析结果显示，未观测到相对于标准模型本底的具有统计显著性的超出。研究在95%置信水平（CL）下，对希格斯玻色子通过一对$\u2006\mathrm{a}_1$衰变至$μμ$bb和$ττ$bb的分支比设定了上限。这些上限依赖于赝标量质量$m_{\mathrm{a}_1}$，观测到的$μμ$bb末态上限范围为(0.17-3.3) $\times$ 10$^{-4}$，$ττ$bb末态上限范围为(1.7-7.7) $\times$ 10$^{-2}$。在包含两个希格斯二重态和一个复标量单态的模型（2HDM+S）框架下，研究合并了两个末态的结果，以确定95%置信水平下分支比$\mathcal{B}$(H $\to$ $\mathrm{a}_1\mathrm{a}_1$ $\to$ $\ell\ell$bb)的模型无关上限，其中$\ell$为μ子或$τ$轻子。针对不同类型的2HDM+S，研究从两个通道的合并结果中提取了分支比$\mathcal{B}$(H $\to$ $\mathrm{a}_1\mathrm{a}_1$)的上限。在大多数II型2HDM+S的参数空间中，当$m_{\mathrm{a}_1}$处于15至60 GeV之间时，大于0.23的$\mathcal{B}($H $\to$ $\mathrm{a}_1\mathrm{a}_1$)值在95%置信水平下被排除。

英文摘要：

A search for exotic decays of the Higgs boson (H) with a mass of 125 GeV to a pair of light pseudoscalars $\mathrm{a}_1$ is performed in final states where one pseudoscalar decays to two b quarks and the other to a pair of muons or $τ$ leptons. A data sample of proton-proton collisions at $\sqrt{s}$ = 13 TeV corresponding to an integrated luminosity of 138 fb$^{-1}$ recorded with the CMS detector is analyzed. No statistically significant excess is observed over the standard model backgrounds. Upper limits are set at 95% confidence level (CL) on the Higgs boson branching fraction to $μμ$bb and to $ττ$bb, via a pair of $\mathrm{a}_1$s. The limits depend on the pseudoscalar mass $m_{\mathrm{a}_1}$ and are observed to be in the range (0.17-3.3) $\times$ 10$^{-4}$ and (1.7-7.7) $\times$ 10$^{-2}$ in the $μμ$bb and $ττ$bb final states, respectively. In the framework of models with two Higgs doublets and a complex scalar singlet (2HDM+S), the results of the two final states are combined to determine model-independent upper limits on the branching fraction $\mathcal{B}$(H $\to$ $\mathrm{a}_1\mathrm{a}_1$ $\to$ $\ell\ell$bb) at 95% CL, with $\ell$ being a muon or a $τ$ lepton. For different types of 2HDM+S, upper bounds on the branching fraction $\mathcal{B}$(H $\to$ $\mathrm{a}_1\mathrm{a}_1$) are extracted from the combination of the two channels. In most of the Type II 2HDM+S parameter space, $\mathcal{B}($H $\to$ $\mathrm{a}_1\mathrm{a}_1$) values above 0.23 are excluded at 95% CL for $m_{\mathrm{a}_1}$ values between 15 and 60 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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