In a general two-Higgs-doublet model (2HDM), without the ad hoc discrete symmetries to prevent tree-level flavor-changing-neutral currents, an extra phase angle in the charged-Higgs-fermion coupling is allowed. We show that the charged-Higgs amplitude interferes destructively or constructively with the standard model amplitude depending crucially on this phase angle. The popular model I and II ...

In the absence of natural avor conservation, multi-Higgs doublet models generally contain new sources of CP violation and anomalous charged Higgs Yukawa couplings. We present a chargedHiggs CP violation study of one such two-Higgs doublet model (2HDM) which treats the top quark di erently from the other quarks. The phenomenological implications for the K K system and for B decays di er signi ca...

In the global fit of the SM using Gfitter, electroweak precision observables as well as constraints from direct Higgs searches have been compared with state-of-the-art electroweak predictions. We use the most recent results for direct Higgs searches at LEP and Tevatron and the latest measurements of mt and MW . Example results are an estimation of the mass of the Higgs boson (MH = 116.3 +15.6 −...

Searches are presented for heavy scalar (H) and pseudoscalar (A) Higgs bosons posited in the two doublet model (2HDM) extensions of the standard model (SM). These searches are based on a data sample of pp collisions collected with the CMS experiment at the LHC at a center-of-mass energy of √ s = 8 TeV and corresponding to an integrated luminosity of 19.5 fb−1. The decays H → hh and A → Zh, wher...

We discuss corrections to ∆M B d , ∆M Bs and to the CP violation parameter ε in two examples of (generalized) minimal flavour violation models: 2HDM and MSSM in the large tan β limit. We show that for H + not too heavy, ∆M Bs in the MSSM with heavy sparticles can be substantially smaller than in the SM due the charged Higgs box contributions and in particular due to the growing like tan 4 β con...

The experimental measurement of B(b → sγ) imposes important constraints on the charged Higgs boson mass in the MSSM. If squarks are in the few TeV range, the charged Higgs boson mass in the MSSM must satisfy mH± ∼440 GeV. For lighter squarks, then light charged Higgs bosons can be reconciled with B(b → sγ) only if there is also a light chargino. In the MSSM if we impose m χ ± 1 > 90 GeV then we...

A light neutral Higgs boson in the framework of the general two Higgs doublet model (2HDM) is not excluded by existing data. We point out that it can be looked for at the proposed low energy γγ collider. Failure to detect one may lead to important limits on the parameters of the general 2HDM. [email protected] [email protected] Supported in part by grants from Polish Committee for Scientif...