Fitting the $Zb\bar{b}$ vertex in the two-Higgs-doublet model and in the three-Higgs-doublet model

Abstract

We investigate the new contributions to the parameters $g_L$ and $g_R$ of the $Zb\bar{b}$ vertex in a multi-Higgs-doublet model (MHDM). We emphasize that those contributions generally worsen the fit of those parameters to the experimental data. We propose a solution to this problem, wherein $g_R$ has the opposite sign from the one predicted by the Standard Model; this solution, though, necessitates light scalars and large Yukawa couplings in the MHDM.

30 pages, 13 figures; v2: added two footnotes and two references; v3: modified 4 figures and added 3 new figures, all sections have changes, added new appendix and added references; v4 matches published version

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• Updated NNLO QCD predictions for the weak radiative B-meson decays
• The oblique parameters in multi-Higgs-doublet models
• A precision constraint on multi-Higgs-doublet models
• Minkowski space structure of the Higgs potential in 2HDM: II. Minima, symmetries, and topology
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Cited by in corpus (1)

• Slight excess at 130 GeV in search for a charged Higgs boson decaying to a charm quark and a bottom quark at the Large Hadron Collider