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arXiv 1405.3530hep-phastro-ph.COhep-ex
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Higgs门暗物质模型中不可见Higgs衰变宽度与暗物质直接探测截面的关系

Invisible Higgs Decay Width vs. Dark Matter Direct Detection Cross Section in Higgs Portal Dark Matter Models

Seungwon Baek, P. Ko, Wan-Il Park

备注：
6 pages, 2 figures
发表信息：
Phys. Rev. D 90, 055014 (2014)
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摘要：

在Higgs门DM模型中，不可见Higgs分支比（$B_h^{\rm inv} $）与暗物质（DM）直接探测（$σ_p^{\rm SI}$）之间的相关性通常在有效场论（EFT）框架中给出。这对于单重标量DM是好的，但在单重费米子DM（SFDM）或矢量DM（VDM）模型中不是。在本文中，我们推导出这种相关性的显式表达式内的UV完成的SFDM和VDM模型与Higgs门户，并讨论EFT方法的局限性。我们证明了在紫外完备中$σ_p^{\rm SI}$至少还有两个额外的隐藏参数：类单态标量质量$m_2$和它与SM Higgs玻色子的混合角$α$（$h$）.特别是，如果类单态标量比SM希格斯玻色子（$m_2 < m_h \cos α/ \sqrt{1 + \cos^2 α}$）轻，对撞机束缚就会比基于EFT的束缚弱。

英文摘要：

The correlation between the invisible Higgs branching ratio ($B_h^{\rm inv} $) vs. dark matter (DM) direct detection ($σ_p^{\rm SI}$) in Higgs portal DM models is usually presented in the effective field theory (EFT) framework. This is fine for singlet scalar DM, but not in the singlet fermion DM (SFDM) or vector DM (VDM) models. In this paper, we derive the explicit expressions for this correlation within UV completions of SFDM and VDM models with Higgs portals, and discuss the limitation of the EFT approach. We show that there are at least two additional hidden parameter in $σ_p^{\rm SI}$ in the UV completions: the singlet-like scalar mass $m_2$ and its mixing angle $α$ with the SM Higgs boson ($h$). In particular, if the singlet-like scalar is lighter than the SM Higgs boson ($m_2 < m_h \cos α/ \sqrt{1 + \cos^2 α}$), the collider bound becomes weaker than the one based on EFT.

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