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arXiv 1809.05937hep-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 a Higgs boson produced through vector boson fusion in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

使用2016年在LHC的CMS探测器收集的质子-质子碰撞数据进行希格斯玻色子的不可见衰变的搜索,质心能量为$\sqrt{s} =$ 13 TeV,对应于35.9 fb $^{-1}$的积分亮度。这项研究的目标是通过矢量玻色子融合产生希格斯玻色子。发现数据与来自标准模型过程的背景贡献一致。假设标准模型的产生率和希格斯玻色子玻色子的质量为125.09 GeV,在95%的置信水平下,观测到的(预期的)上限为0.33(0.25),被放置在希格斯玻色子玻色子衰变为不可见粒子的分支分数上。从这个分析和其他直接搜索的组合的结果看不见的衰变的希格斯玻色子,使用收集的数据在$\sqrt{s} =$ 7,8和13 TeV,进行。在95%的置信水平下,观察到的(预期的)上限为0.19(0.15),设定在希格斯玻色子玻色子不可见衰变的分支分数上。这两个极限代表了迄今为止报道的希格斯玻色子不可见分支分数的最严格限制。这一结果也被解释的背景下,希格斯门暗物质模型,其中上界被放置在自旋无关的暗物质核子散射截面。

英文摘要:

A search for invisible decays of a Higgs boson is performed using proton-proton collision data collected with the CMS detector at the LHC in 2016 at a center-of-mass energy $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The search targets the production of a Higgs boson via vector boson fusion. The data are found to be in agreement with the background contributions from standard model processes. An observed (expected) upper limit of 0.33 (0.25), at 95% confidence level, is placed on the branching fraction of the Higgs boson decay to invisible particles, assuming standard model production rates and a Higgs boson mass of 125.09 GeV. Results from a combination of this analysis and other direct searches for invisible decays of the Higgs boson, performed using data collected at $\sqrt{s} =$ 7, 8, and 13 TeV, are presented. An observed (expected) upper limit of 0.19 (0.15), at 95% confidence level, is set on the branching fraction of invisible decays of the Higgs boson. The combined limit represents the most stringent bound on the invisible branching fraction of the Higgs boson reported to date. This result is also interpreted in the context of Higgs-portal dark matter models, in which upper bounds are placed on the spin-independent dark-matter-nucleon scattering cross section.

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