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arXiv 1806.04771hep-ex
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在$\sqrt{s} =$ 13 TeV寻找与衰变为$γγ$或$τ^+τ^-$的希格斯玻色子有关的暗物质

Search for dark matter produced in association with a Higgs boson decaying to $γγ$ or $τ^+τ^-$ at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

寻找暗物质粒子的方法是寻找具有大的横向动量不平衡和反冲的希格斯玻色子衰变为一对光子或一对$τ$轻子的事件。该搜索基于2016年在CERN LHC收集的质心能量为13 TeV的质子-质子碰撞数据,对应于35.9 fb $^{-1}$的综合光度。未观察到超过预期标准模型背景的显著过量。在95%的置信水平的上限为产品的生产横截面和分支分数的背景下,两个基准简化模型。对于Z '-two-Higgs-doublet模型(其中Z'是一个新的大质量玻色子介质),其中包含一个质量为$m_\mathrm{A} =$ 300 GeV和$m_\mathrm{DM} =$ 100 GeV的中间重赝标粒子,Z'的质量从550 GeV到1265 GeV都被排除。对于重子Z'模型,$m_\mathrm{DM} =$ 1 GeV,Z'质量不超过615 GeV。结果还提出了自旋无关截面的暗物质-核子相互作用的暗物质粒子的质量的函数。这是第一次寻找与希格斯玻色子衰变为两个$τ$轻子有关的暗物质粒子。

英文摘要:

A search for dark matter particles is performed by looking for events with large transverse momentum imbalance and a recoiling Higgs boson decaying to either a pair of photons or a pair of $τ$ leptons. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV collected at the CERN LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb$^{-1}$. No significant excess over the expected standard model background is observed. Upper limits at 95% confidence level are presented for the product of the production cross section and branching fraction in the context of two benchmark simplified models. For the Z'-two-Higgs-doublet model (where Z' is a new massive boson mediator) with an intermediate heavy pseudoscalar particle of mass $m_\mathrm{A} =$ 300 GeV and $m_\mathrm{DM} =$ 100 GeV, Z' masses from 550 GeV up to 1265 GeV are excluded. For a baryonic Z' model, with $m_\mathrm{DM} =$ 1 GeV, Z' masses up to 615 GeV are excluded. Results are also presented for the spin-independent cross section for the dark matter-nucleon interaction as a function of the mass of the dark matter particle. This is the first search for dark matter particles produced in association with a Higgs boson decaying to two $τ$ leptons.

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