Higgs boson couplings in multi-doublet models with natural flavour conservation

TL;DR

This paper analyzes how Higgs boson couplings deviate from Standard Model predictions in multi-doublet models with natural flavor conservation, providing general formulas and exploring correlations in 2HDMs and 3HDMs.

Contribution

It derives general expressions for modified Higgs couplings and explores their correlations in multi-doublet models with natural flavor conservation, highlighting differences between 2HDMs and 3HDMs.

Findings

Correlation between tau and bottom Yukawa couplings deviations

3HDMs predict deviations not possible in 2HDMs

Allowed deviation predictions in 3HDMs are clarified

Abstract

We investigate the deviation in the couplings of the standard model (SM) like Higgs boson ($h$) with a mass of 125 GeV from the prediction of the SM in multi-doublet models within the framework where flavour changing neutral currents at the tree level are naturally forbidden. After we present the general expressions for the modified gauge and Yukawa couplings for $h$, we show the correlation between the deviation in the Yukawa coupling for the tau lepton $h\tau^+\tau^-$ and that for the bottom quark $hb\bar{b}$ under the assumption of a non-zero deviation in the $hVV$ $(V=W,Z)$ couplings in two Higgs doublet models (2HDMs) and three Higgs doublet models (3HDMs) as simple examples. We clarify the possible allowed prediction of the deviations in the 3HDMs which cannot be explained in the 2HDMs even taking into account the one-loop electroweak corrections to the Yukawa coupling.