We consider constraints from flavor physics on two-Higgs-doublet models (2HDM) with general, flavor-diagonal, Yukawa couplings. Analyzing the charged Higgs contribution to different observables, we find that b$\rightarrow${}s$\gamma${} transitions and $\Delta${}MBd restrict the coupling $\lambda${}tt of the top quark (corresponding to cot{}$\beta${} in models with a Z2 symmetry) to |$\lambda${}tt|<1 for mH+$\lesssim${}500\,\,GeV. Stringent constraints from B meson decays are obtained also on the other third generation couplings $\lambda${}bb and $\lambda${}$\tau${}$\tau${}, but with stronger dependence on mH+. For the second generation, we obtain constraints on combinations of $\lambda${}ss, $\lambda${}cc, and $\lambda${}$\mu${}$\mu${} from leptonic K and Ds decays. The limits on the general couplings are translated to the common 2HDM types I\char21{}IV with a Z2 symmetry, and presented on the (mH+,tan{}$\beta${}) plane. The flavor constraints are most excluding in the type II model which lacks a decoupling limit in tan{}$\beta${}. We obtain a lower limit mH+$\gtrsim${}300\,\,GeV in models of type II and III, while no lower bound on mH+ is found for types I and IV.

The existence of charged Higgs boson(s) is inevitable in models with two (or more) Higgs doublets. Hence, their discovery would constitute unambiguous evidence for new physics beyond the Standard...

The long awaited discovery of a new light scalar boson at the LHC opens up a new era of studies of the Higgs sector in the Standard Model and in its extensions. In this paper we discuss the consequences of the observation of a light Higgs boson with the mass and rates reported by the ATLAS and CMS collaborations on the parameter space of the phenomenological MSSM, accounting also for the LHC searches for heavier Higgs bosons and supersymmetric particle partners, as well as constraints from B-physics and dark matter. We explore the various regimes of the MSSM Higgs sector, depending on the parameters M _A and tan β, and show that only two of them are still allowed by all present experimental constraints: the decoupling regime, in which there is only one light and standard-like Higgs boson while the heavier Higgs states decouple from gauge bosons, and the supersymmetric regime, in which there are light supersymmetric particle partners which might affect the decay properties of the light Higgs boson, in particular its di-photon and invisible decays.

There are some slight tensions with the SM predictions within the latest LHCb measurements. Besides the known anomaly in one angular observable of the rare decay B → K ^* μ ⁺ μ ⁻, another small discrepancy recently occurred. The ratio R _K = BR(B ⁺ → K ⁺ μ ⁺ μ ⁻)/BR(B ⁺ → K ⁺ e ⁺ e ⁻) in the low-q ² region has been measured by LHCb showing a 2.6σ deviation from the SM prediction. In contrast to the anomaly in the rare decay B → K ^* μ ⁺ μ ⁻ which is affected by power corrections, the ratio R _K is theoretically rather clean. We analyse all the b → sℓℓ data with global fits and in particular explore the possibility of breaking of lepton universality. Possible cross-checks with an analysis of the inclusive B → X _s ℓ ⁺ ℓ ⁻ decay are also explored.

The latest LHCb angular analysis of the rare decay B → K ^∗ μ ⁺ μ ⁻ shows some discrepancies from the SM up to the 3.7σ level. There is a consistent new physics explanation of these anomalies, while it is also reasonable that these anomalies are just statistical fluctuations and/or a direct consequence of underestimated hadronic uncertainties. We briefly discuss possible cross-checks of the various hypotheses with an analysis of the inclusive B → X _s ℓ ⁺ ℓ ⁻ based on the data collected by the B factories Babar and Belle and also based on future opportunities at SuperBelle. We also present a global analysis of the latest LHCb data under the hypothesis of Minimal Flavour Violation. The latter is an important benchmark scenario for new physics models. Any measurements beyond the MFV bounds and relations unambiguously indicate the existence of new flavour structures next to the Yukawa couplings of the Standard Model. However, if new physics is responsible for these discrepancies, we show it is compatible with the MFV hypothesis, so no new flavour structures are needed. Moreover, we analyse the impact of the correlations between the observables based on a Monte Carlo study.

We present a brief update of our model-independent analyses of the $b\to s$ data presented in the articles published in Phys. Rev. D 96, 095034 (2017) and Phys. Rev. D 98, 095027 (2018) based on new data on $R_K$ by LHCb, on $R_{K^{*}}$ by Belle, and on $B_{s,d}\to {\mu }^{+}{\mu }^{-}$ by ATLAS.