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arXiv 2201.11585hep-ex
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在$\sqrt{s} =$ 13 TeV质子-质子碰撞中通过矢量玻色子融合产生的希格斯玻色子的不可见衰变的搜寻

Search for invisible decays of the Higgs boson produced via vector boson fusion in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

通过矢量玻色子聚变(VBF)产生的希格斯玻色子的不可见衰变的搜索已经用LHC在$\sqrt{s} =$ 13 TeV下提供的101 fb $^{-1}$进行,并由CMS探测器在2017年和2018年收集。通过构建两个分析类别,一个是基于缺失的横向动量,第二个是基于射流的性质,提高了对VBF生产机制的敏感性。除了具有Z和W玻色子候选事件的控制区域之外,基于与喷流相关联的光子的产生的高度填充的控制区域用于约束与喷流相关联的Z玻色子的不可见衰变的主导不可约背景。该搜索的结果与VBF拓扑中的所有先前测量相结合,基于2012年($\sqrt{s} =$ 8 TeV)、2015年和2016年收集的数据,分别对应于19.7、2.3和36.3 fb $^{-1}$的积分亮度。假设标准模型产生截面,在95%的置信水平下,观测到的(预期的)希格斯玻色子不可见分支分数的上限为0.18(0.10)。结果也解释的背景下,希格斯门模型。

英文摘要:

A search for invisible decays of the Higgs boson produced via vector boson fusion (VBF) has been performed with 101 fb$^{-1}$ of proton-proton collisions delivered by the LHC at $\sqrt{s} =$ 13 TeV and collected by the CMS detector in 2017 and 2018. The sensitivity to the VBF production mechanism is enhanced by constructing two analysis categories, one based on missing transverse momentum, and a second based on the properties of jets. In addition to control regions with Z and W boson candidate events, a highly populated control region, based on the production of a photon in association with jets, is used to constrain the dominant irreducible background from the invisible decay of a Z boson produced in association with jets. The results of this search are combined with all previous measurements in the VBF topology, based on data collected in 2012 (at $\sqrt{s} =$ 8 TeV), 2015, and 2016, corresponding to integrated luminosities of 19.7, 2.3, and 36.3 fb$^{-1}$, respectively. The observed (expected) upper limit on the invisible branching fraction of the Higgs boson is found to be 0.18 (0.10) at the 95% confidence level, assuming the standard model production cross section. The results are also interpreted in the context of Higgs-portal models.

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