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Title: Nonstandard Yukawa couplings and Higgs portal dark matter

We study the implications of non-standard Higgs Yukawa couplings to light quarks on Higgs-portal dark matter phenomenology. Saturating the present experimental bounds on up-quark, down-quark, or strange-quark Yukawa couplings, the predicted direct dark matter detection scattering rate can increase by up to four orders of magnitude. The effect on the dark matter annihilation cross-section, on the other hand, is subleading unless the dark matter is very light — a scenario that is already excluded by measurements of the Higgs invisible decay width. We investigate the expected size of corrections in multi-Higgs-doublet models with natural flavor conservation, the type-II two-Higgs-doublet model, the Giudice-Lebedev model of light quark masses, minimal flavor violation new physics models, Randall-Sundrum, and composite Higgs models. We find that an enhancement in the dark matter scattering rate of an order of magnitude is possible. In conclusion, we point out that a discovery of Higgs-portal dark matter could lead to interesting bounds on the light-quark Yukawa couplings.
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Cincinnati, Cincinnati, OH (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Johannes Gutenberg Univ., Mainz (Germany)
  3. Srinakharinwirot Univ., Bangkok (Thailand)
  4. Univ. of Cincinnati, Cincinnati, OH (United States)
Publication Date:
Report Number(s):
FERMILAB-PUB-15-134-T; MITP-15-020
Journal ID: ISSN 1029-8479; arXiv eprint number arXiv:1504.04022
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 1; Journal ID: ISSN 1029-8479
Springer Berlin
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Higgs physics; Quark masses and SM parameters
OSTI Identifier: