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Fitting the Zbb¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ Zb\overline{b} $$\end{document} vertex in the two-Higgs-doublet model and in the three-Higgs-doublet model

Authors
  • Jurčiukonis, Darius1
  • Lavoura, Luís2
  • 1 Vilnius University, Institute of Theoretical Physics and Astronomy, Saulėtekio ave. 3, Vilnius, 10257, Lithuania , Vilnius (Lithuania)
  • 2 Universidade de Lisboa, Instituto Superior Técnico, CFTP, Av. Rovisco Pais 1, Lisboa, 1049-001, Portugal , Lisboa (Portugal)
Type
Published Article
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Publication Date
Jul 26, 2021
Volume
2021
Issue
7
Identifiers
DOI: 10.1007/JHEP07(2021)195
Source
Springer Nature
Keywords
Disciplines
  • Regular Article - Theoretical Physics
License
Green

Abstract

We investigate the new contributions to the parameters gL and gR of the Zbb¯\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ Zb\overline{b} $$\end{document} 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 gR 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.

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