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Impact of the 125?GeV Higgs boson on singlet fermion dark matter searches at the LHC

机译：LHC中125？GeV希格斯玻色子对单重态费米子暗物质搜索的影响

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The search for singlet fermion dark matter at high-energy colliders is commonly analyzed with a singlet scalar mediator, which however violates the standard model (SM) gauge invariance, renormalizability and unitarity. These problems can be cured by introducing a mixing between the singlet scalar s and the SM Higgs boson h . Thus one has to consider two scalar mediators h 1 and h 2 , where h 1 is identified as the discovered 125?GeV Higgs boson. As a specific example, we consider the dark matter (DM) search in the t t ˉ + E T channel. According to the masses of dark matter and two scalar mediators, we classify the process into four cases. By investigating the total cross sections and differential distributions, we find that the contribution of the 125?GeV Higgs boson h 1 cannot be neglected in all cases and can even dominate once h 1 is on shell in dark matter production. Further, we study the impact of h 1 on the LHC bounds of dark matter searches in the hadronic and semileptonic channels with the integrated luminosity of 36 ? ? fb ? 1 . Finally we make a brief comment that h 1 should be also considered in the vector DM search at high-energy colliders.
机译：通常使用单重态标量介体来分析在高能对撞机上寻找单重态费米子暗物质的方法，但是这种行为违反了标准模型（SM）的尺度不变性，可归一化性和统一性。这些问题可以通过在单重标量s和SM希格斯玻色子h之间引入混合来解决。因此，必须考虑两个标量介体h 1和h 2，其中h 1被标识为已发现的125？GeV Higgs玻色子。作为一个具体示例，我们考虑在t tˉ+ E T通道中进行暗物质（DM）搜索。根据暗物质的质量和两个标量介体的数量，我们将该过程分为四种情况。通过研究总横截面和微分分布，我们发现在所有情况下都不能忽略125？GeV希格斯玻色子h 1的贡献，甚至在深色物质生产中将h 1置于壳上时也可以占主导地位。此外，我们研究了h 1对强子和半轻通道中暗物质搜索的LHC界线的影响，其综合光度为36？。 ？ fb？ 1。最后，我们做出简短的评论，即在高能对撞机的矢量DM搜索中也应考虑h 1。

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