2 research outputs found
mixing in the minimal flavor-violating two-Higgs-doublet models
The two-Higgs-doublet model (2HDM), as one of the simplest extensions of the
Standard Model (SM), is obtained by adding another scalar doublet to the SM,
and is featured by a pair of charged scalars, which could affect many
low-energy processes. In the "Higgs basis" for a generic 2HDM, only one scalar
doublet gets a nonzero vacuum expectation value and, under the criterion of
minimal flavor violation, the other one is fixed to be either color-singlet or
color-octet, which are named as the type-III and the type-C 2HDM, respectively.
In this paper, we study the charged-scalar effects of these two models on the
mixing, an ideal process to probe New Physics (NP) beyond the
SM. Firstly, we perform a complete one-loop computation of the box diagrams
relevant to the mixing, keeping the mass and momentum of the
external strange quark up to the second order. Together with the up-to-date
theoretical inputs, we then give a detailed phenomenological analysis, in the
cases of both real and complex Yukawa couplings of the charged scalars to
quarks. The parameter spaces allowed by the current experimental data on the
mass difference and the CP-violating parameter are
obtained and the differences between these two 2HDMs are investigated, which
are helpful to distinguish them from each other from a phenomenological point
of view.Comment: 30 pages,10 figures, 2 table