Pseudo-Nambu-Goldstone dark matter and two-Higgs-doublet models

Jul 22, 2019
18 pages
Published in:
  • Phys.Rev.D 100 (2019) 7, 075011
  • Published: Oct 11, 2019
e-Print:

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Abstract: (arXiv)
We study a dark matter model with one singlet complex scalar and two Higgs doublets. The scalar potential respects a softly broken global symmetry, which makes the imaginary part of the singlet become a pseudo-Nambu-Goldstone boson acting as a dark matter candidate. The pseudo-Nambu-Goldstone nature of the boson leads to the vanishing of its tree-level scattering amplitude off nucleons at zero momentum transfer. Therefore, although the interaction strength could be sufficiently large to yield a viable relic abundance via thermal mechanism, direct detection is incapable of probing this candidate. We further investigate the constraints from Higgs measurements, relic abundance observation, and indirect detection.
Note:
  • 33 pages, 11 figures; revisions to match the published version
  • Beyond the standard model
  • Higgs particle: doublet: 2
  • Goldstone particle: pseudoscalar
  • Goldstone particle: scattering amplitude
  • potential: scalar
  • symmetry: global
  • symmetry breaking: model
  • singlet: 1
  • dark matter: scalar
  • dark matter: relic density