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arXiv 1408.2106hep-ph
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单重态标量场对双希格斯模型的扩展--暗物质的情况

Extending two-Higgs-doublet models by a singlet scalar field - the Case for Dark Matter

Aleksandra Drozd, Bohdan Grzadkowski, John F. Gunion, Yun Jiang

摘要:

我们通过增加一个真实的规范单重标量S暗物质候选者(2 HDMS模型)来扩展I型和II型的双希格斯粒子模型。我们从微扰性、稳定性、么正性和正确的电弱对称性破缺等方面提出了理论上的约束条件,并要求最轻的CP偶Higgs,h,在$68\%$ ~ C. L处符合$\sim 125.5$ GeV态的LHC数据。在包括LEP和B物理学以及LHC对较重的希格斯玻色子的限制之后。我们发现,这些模型很容易与LUX和SuperCDMS的限制暗物质核子散射和观察到的$Ωh^2$ S质量高于约55 GeV的一致。在较低的$m_S$下,情况更加微妙。对于$m_S$在6-25 GeV范围内对应于CDMS~II和CRESST-II正信号范围的点,由I型和II型模型预测的暗物质-核子截面或多或少自动落在$95\%-99\%$ ~ C. L.信号区域边界。如果不是因为LUX和SuperCDMS限制,在I型(II型)的情况下排除了所有(几乎所有)这样的点,这将是2 HDMS模型的成功。事实上,在II型的情况下,有几个5.5 GeV $\leq m_S \leq$ 6.2 GeV的点在LUX和SuperCDMS极限下存活,并落在CDMS~II 99\%C. L内。信号区。本文还讨论了在2 HDMS背景下暗物质的同位旋破坏可能性。

英文摘要:

We extend the two-Higgs doublet models of Type I and Type II by adding a real gauge-singlet scalar S dark matter candidate (2HDMS models). We impose theoretical constraints deriving from perturbativity, stability, unitarity and correct electroweak symmetry breaking and require that the lightest CP-even Higgs, h, fit the LHC data for the $\sim 125.5$ GeV state at the $68\%$~C.L. after including existing constraints from LEP and B physics and LHC limits on the heavier Higgs bosons. We find that these models are easily consistent with the LUX and SuperCDMS limits on dark-matter-Nucleon scattering and the observed $Ωh^2$ for S masses above about 55 GeV. At lower $m_S$, the situation is more delicate. For points with $m_S$ in the 6-25 GeV range corresponding to the CDMS~II and CRESST-II positive signal ranges, the dark-matter-Nucleon cross sections predicted by the Type I and Type II models more or less automatically fall within the $95\%-99\%$~C.L. signal region boundaries. Were it not for the LUX and SuperCDMS limits, which exclude all (almost all) such points in the case of Type I (Type II), this would be a success for the 2HDMS models. In fact, in the case of Type II there are a few points with 5.5 GeV $\leq m_S \leq$ 6.2 GeV that survive the LUX and SuperCDMS limits and fall within the CDMS~II 99\% C.L. signal region. Possibilities for dark matter to be isospin-violating in this 2HDMS context are also examined.

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