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arXiv · 1404.2283

The Fermionic Dark Matter Higgs Portal: an effective field theory approach

Michael A. Fedderke·Jing-Yuan Chen·Edward W. Kolb·Lian-Tao Wang
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Abstract

We consider fermionic (Dirac or Majorana) cold thermal relic dark-matter coupling to standard-model particles through the effective dimension-5 Higgs portal operators $Λ^{-1} \ \mathcal{O}_{\text{DM}} \cdot H^\dagger H$, where $\mathcal{O}_{\text{DM}}$ is an admixture of scalar $\barχχ$ and pseudoscalar $\barχiγ_5 χ$ DM operators. Utilizing the relic abundance requirement to fix the couplings, we consider direct detection and invisible Higgs width constraints, and map out the remaining allowed parameter space of dark-matter mass and the admixture of scalar and pseudoscalar couplings. We emphasize a subtlety which has not previously been carefully studied in the context of the EFT approach, in which an effect arising due to electroweak symmetry breaking can cause a naïvely pure pseudoscalar coupling to induce a scalar coupling at higher order, which has important implications for direct detection bounds. We provide some comments on indirect detection bounds and collider searches.

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Michael A. Fedderke, Jing-Yuan Chen, Edward W. Kolb, Lian-Tao Wang. 2014-08-23. The Fermionic Dark Matter Higgs Portal: an effective field theory approach. https://doi.org/10.1007/jhep08(2014)122

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