We introduce a strategy to study the parameter space of the general, CP-conserving, twoHiggs-doublet Model (2HDM) with a softly broken Z2-symmetry by means of a new “hybrid” basis. In this basis the input parameters are the measured values of the mass of the observed Standard Model (SM)-like Higgs boson and its coupling strength to vector boson pairs, the mass of the second CP-even Higgs boson,...

We will investigate the scenario in which the Standard Model (SM) Higgs sector and its two-doublet extension (called the Two Higgs Doublet Model or 2HDM) are the "portal" for the interactions between the Standard Model and a fermionic Dark Matter (DM) candidate. The latter is the lightest stable neutral particle of a family of vector-like leptons (VLLs). We will provide an extensive overview of...

The production process of the charged Higgs-boson associated with a W boson at electron-positron colliders is discussed in the two-Higgs-Doublet Model (2HDM) and in the Minimal Supersymmetric Standard Model (MSSM). The process is induced at one-loop level in these models. We examine how much the cross section can be enhanced by quarkand Higgs-loop effects. In the non-SUSY 2HDM, in addition to l...

We study loop-induced parity violating asymmetries in the strong production of polarized top quark pairs at pp and pp̄ colliders. The electroweak O(α) corrections to the helicity amplitudes of qq̄ → tt̄ and gg → tt̄ are evaluated in a two Higgs doublet model (2HDM) and the minimal supersymmetric standard model (MSSM). While observables in top quark pair production receive little contribution from s...

We discuss new physics (NP) contributions to kaon mixing parameter $\varepsilon_K$, direct CP violation $\varepsilon^\prime/\varepsilon$ of $K\to \pi\pi$, and rare decays $K^+\to \pi^+\nu\bar\nu$, $K_L\to \pi^0\nu\bar\nu$ $K_{L, S}\to \mu^+ \mu^- $ in the context general two Higgs doublet model. focus on top quark related exotic couplings, show that simultaneous presence flavor conserving viola...

Anomalous moments of the top quark arises from one loop corrections to the vertices t̄tg and t̄tγ . We study these anomalous couplings in different frameworks: effective theories, Standard Model and 2HDM. We use available experimental results in order to get bounds on these anomalous couplings.

The rare K + → π + ν ¯ ν decay is investigated in the context of type II two-Higgs-doublet model (2HDM). By using the existing experimental data of the branching ratio, restrictions on the free parameters of the model m H , and tanβ are obtained: 0.7 ≤ tanβ ≤ 0.8, and 500GeV ≤ m H ≤ 700GeV .

Minimal extensions of the Standard Model (SM), such as so-called Two Higgs Doublet (2HDM), can possess several accidental discrete symmetries whose spontaneous breakdown in early universe usually lead to formation domain walls. We extend an earlier work [arXiv:2006.13273] on this topic by studying more detail analytic properties electrically charged and CP-violating kink solutions $Z_{2}$-symme...