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Models with extended Higgs boson sectors are of prime importance forinvestigating the mechanism of electroweak symmetry breaking for Higgs decaysinto four fermions and for Higgs-production in association with a vectorbosons. In the framework of the Two-Higgs-Doublet Model using two scenariosobtained from the experimental measurements we presented next-to-leading-orderresults on the four-fermion decays of light CP-even Higgs boson, $h \rightarrow4f$. With the help of Monte Carlo program Prophecy 4f 3.0, we calculated thevalues $\Gamma= \Gamma_{EW} /\left(\Gamma_{EW}+\Gamma_{SM}\right)$ and $\Gamma=\Gamma_{EW+QCD} /\left(\Gamma_{EW+QCD}+\Gamma_{SM}\right)$ for Higgs bosondecay channels $ H \rightarrow \nu_{\mu} \overline{\mu} e \overline{\nu_e}$,$\mu \overline{\mu} e \overline{e}$, $e \overline{e} e \overline{e}$. We didn'tfind significant difference when accounting QCD corrections to EW processes inthe decay modes of Higgs boson. Using computer programs Pythia 8.2 andFeynHiggs we calculated the following values: $\sigma(VBH)BR(H\rightarrow ZZ)$and $\sigma(VBF)BR(H \rightarrow WW)$ for VBF production processes,$\sigma(ggH)BR(H \rightarrow WW)$ and $\sigma(ggH)BR(H \rightarrow ZZ)$ forgluon fusion production process at 13 and 14 TeV and found good agreement withexperimental data.

Investigations of electroweak symmetry breaking mechanism for Higgs boson decays into four fermions