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arXiv 1802.03388hep-ex
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用$\sqrt{s}=13$ TeV的ATLAS探测器在四轻子事件中寻找希格斯玻色子衰变到超标准模型轻玻色子

Search for Higgs boson decays to beyond-the-Standard-Model light bosons in four-lepton events with the ATLAS detector at $\sqrt{s}=13$ TeV

ATLAS Collaboration

摘要:

利用质量为125 GeV的希格斯玻色子衰变为4个轻子($\ell =$ $e$或$μ$)的事件,对新的超越标准模型玻色子进行了搜索。这种衰变被认为是通过一个中间态发生的,其中包含一个或两个在壳层上迅速衰变的玻色子:$H\rightarrow ZX/XX \rightarrow 4\ell$,其中$X$是一个新的矢量玻色子$Z_d$或赝标量$a$,质量在1到60 GeV之间。搜索使用$pp$碰撞数据收集的ATLAS探测器在大型强子对撞机的综合光度为36.1 fb $^{-1}$在质量中心的能量$\sqrt{s}=13$ TeV。没有观察到明显超出标准模型背景预测的事件;因此,在95%置信水平下的上限设置在模型独立的基准截面上,以及在两个基准模型中的希格斯玻色子玻色子衰变分支比到矢量和赝标量玻色子上。

英文摘要:

A search is conducted for a new beyond-the-Standard-Model boson using events where a Higgs boson with mass 125 GeV decays to four leptons ($\ell =$ $e$ or $μ$). This decay is presumed to occur via an intermediate state which contains one or two on-shell, promptly decaying bosons: $H\rightarrow ZX/XX \rightarrow 4\ell$, where $X$ is a new vector boson $Z_d$ or pseudoscalar $a$ with mass between 1 and 60 GeV. The search uses $pp$ collision data collected with the ATLAS detector at the LHC with an integrated luminosity of 36.1 fb$^{-1}$ at a centre-of-mass energy $\sqrt{s}=13$ TeV. No significant excess of events above Standard Model background predictions is observed; therefore, upper limits at 95% confidence level are set on model-independent fiducial cross-sections, and on the Higgs boson decay branching ratios to vector and pseudoscalar bosons in two benchmark models.

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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