Abstract
In extensions of the Standard Model with two Higgs doublets, flavor-changing Yukawa couplings of the neutral scalars may be present at tree level. In this work, we consider the most general scenario in which those flavor-changing couplings are absent. We revise the conditions that the Yukawa coupling matrices must obey for such general flavour conservation (gFC) and study the one-loop renormalization group evolution of such conditions in both the quark and lepton sectors. We show that gFC in the leptonic sector is one-loop stable under the renormalization group evolution, and in the quark sector, we present some new Cabibbo-like solution also one-loop stable under renormalization group evolution. At a phenomenological level, we obtain the regions for the different gFC parameters that are allowed by the existing experimental constraints related to the 125 GeV Higgs.
Highlights
Two-Higgs-doublet models (2HDMs) [1,2,3] are a simple and popular class of extensions of the Standard Model (SM)
II, nonreal N f matrices are a source of CP violation in scalar-fermion interactions, which can induce electric dipole moments (EDMs)
For the results presented in the following, we consider the most conservative situation; i.e., all parameters are free to vary simultaneously
Summary
Two-Higgs-doublet models (2HDMs) [1,2,3] are a simple and popular class of extensions of the Standard Model (SM). To name a few generic ones, there are the appearance of new fundamental scalar particles, nonstandard properties of the “quite Higgs-like” scalar discovered at the LHC with a mass of 125 GeV [4,5], and, related to them, a number of potential deviations in low-energy processes with respect to SM expectations. They have been the focus of intense scrutiny before and after the 2012 discovery [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28].
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