Flavor constraints on the Two Higgs Doublet Models of Z 2 symmetric and aligned types

Abstract

Abstract: We give a comprehensive study from flavor observables of π, K, D(s), and B(s) mesons for limiting the Two Higgs Doublet Models (2HDMs) with natural flavor conservation, namely, Z2 symmetric (type I, II, X, Y) and aligned types of models. With use of updated theoretical predictions and experimental analyses of B → τν, D → μν, Ds → τν, Ds → μν, K → μν, π → μν, Bs 0 → μ+μ−, Bd 0 → μ+μ−, τ → Kν, τ → πν, B¯ → Xsγ, K‐ K¯ mixing, Bd0‐ B¯ d0 mixing, and Bs0‐ B¯ s0 mixing, we obtain constraints on the parameters in the 2HDMs. To calculate the constraints, we pay attention to a determination of CKM matrix elements and re-fit them to experimental data so that new contributions from additional Higgs bosons do not affect the determination. As a result, we find that the charged Higgs boson mass less than around 490 GeV is ruled out from B¯ → Xsγ in the type II and Y models, whereas large tan β is excluded from Bs 0 → μ+μ− in the type II. We also see that severe constraints on the mass and couplings are put from B¯ → Xsγ, Bs 0 → μ+μ−, and Bs0‐ B¯ s0 in the aligned model. In addition, we discuss excesses of observables in the muon anomalous magnetic moment and the semi-tauonic B meson decays in the context of the 2HDM, and find that the aligned model can explain part of the excesses, compatible with the other constraints. © 2016, The Author(s)