We study the constraints of the generic two-Higgs-doublet model (2HDM) type-III and the impacts of the new Yukawa couplings. For comparisons, we revisit the analysis in the 2HDM type-II. To understand the influence of all involving free parameters and to realize their correlations, we employ a χ-square fitting approach by including theoretical and experimental constraints, such as the S, T, and U oblique parameters, the production of standard model Higgs and its decay to γγ, WW∗/ ZZ∗,τ+τ-, etc. The errors of the analysis are taken at 68, 95.5, and 99.7% confidence levels. Due to the new Yukawa couplings being associated with cos (β- α) and sin (β- 248α), we find that the allowed regions for sin α and tan β in the type-III model can be broader when the dictated parameter χF is positive; however, for negative χF,the limits are stricter than those in the type-II model. By using the constrained parameters, we find that the deviation from the SM in h→ Zγ can be of O(10%). Additionally, we also study the top-quark flavor-changing processes induced at the tree level in the type-III model and find that when all current experimental data are considered, we get Br(t→ c(h, H)) < 10 -3for mh= 125.36 and mH= 150 GeV, and Br(t→ cA) slightly exceeds 10-3for mA= 130 GeV.
All Science Journal Classification (ASJC) codes
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)