Fermion mass effects on Γ(Z → b ¯ b + a light Higgs) in a two-Higgs-doublet model Abstract Large fermion mass effect on the Yukawa process Z → b ¯ b → b ¯ bh(A) in the entire range of the neutral Higgs boson masses is found. It is particularly important for light Higgs bosons, which are still not excluded experimentally in a general two-Higgs-doublet model. The light Higgs bosons in the context...

We study the ${\text{2HDM}}$ contribution to muon anomalous magnetic moment $a_\mu$ and present complete two-loop result, particularly for bosonic contribution. focus on Aligned ${\text{2HDM}}$, which has general Yukawa couplings contains type I, II, X, Y models as special cases. The result is expressed with physical parameters: three Higgs boson masses, couplings, two mixing angles, one quarti...

Present data do not rule out the light neutral Higgs particle h or A with mass below 40–50 GeV in the framework of the general 2HDM (" Model II "). The status of this model in a light of existing LEP I data and a potential of the new muon experiment (g-2), the measurement of photon-gluon and gluon-gluon fusion at HERA as well as photon-photon fusion at low energy γγ NLC is discussed.

We study the phenomenology of the e − µ lepton flavour violation (LFV) in a general two Higgs Doublet Model (2HDM) including the supersymmetric case. We compute the decay rate expressions of µ → eγ, µ → eee, and µ → e conversion in nuclei at two loop level. In particular, it is shown that µ → eγ is generally the most sensitive channels to probe Higgs-mediated LFV. The correlations among the dec...

We consider the Two Higgs Doublet Model (2HDM) of type III which leads to Flavour Changing Neutral Currents (FCNC) at tree level. In the framework of this model we calculate the NLO contribution for b → sγ and the branchings for the meson decays B+ → l+ν. We examine the limits on the new parameters λbb and MH± . We take into account the relationship between λtt and λbb coming from the validness...

A bstract The electroweak phase transition can be made first order by extending the Standard Model (SM) Higgs sector with extra scalars. same new physics explain matter-antimatter asymmetry of universe supplying an source CP violation and sphaleron processes. In this paper we study existence strong (SFOEWPT) in type-I type-II two doublet models (2HDM). We focus on how SFOEWPT requirements const...

A bstract In this work we revisit the existence of a strong first order electroweak phase transition (SFOEWPT) and recent m W precision measurement in Type-I Type-II 2HDMs. The $$ \mathcal{O} O (100) GeV new scalars 2HDMs are favored by SFOEWPT, which is necessary for baryogenesis, observed shift as well. We ...

The entropy production scenarios due to the electroweak phase transition (EWPT) in framework of minimal extension standard model, namely two Higgs doublet model (2HDM), are revisited. possibility first order is discussed. Intense parameter scanning was done with help BSMPT, a C++ package. We perform numerical calculations calculate numerous benchmark points.

The full one-loop corrections, both the weak and QED to process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}Z\ensuremath{\phi}$ ($\ensuremath{\phi}={h}^{0},{H}^{0}$) in two-Higgs-doublet model (2HDM) at Higgs factories are presented. Up $O({\ensuremath{\alpha}}_{\mathrm{em}})$ level, virtual corrections evaluated by using feynarts/formcalc packages. real emission computed Feynman Diagra...

In the framework of a 2HDM effective lagrangian for the MSSM, we analyse some phenomenological implications of the soft SUSY breaking effects that modify the relation between the bottom mass and the bottom Yukawa coupling. We derive a resummation of the dominant supersymmetric corrections for large values of tanβ to all orders in perturbation theory. With the help of the operator product expans...