Speaker
Description
Models with extended Higgs boson sectors are of prime importance for
investigating the mechanism of electroweak symmetry breaking for Higgs decays
into four fermions and for Higgs-production in association with a vector bosons [1]. In the framework of the Two-Higgs-Doublet Model [2] using two scenarios obtained from the experimental measurements we presented next-to-leading-order results on the four-fermion decays of light CP-even Higgs boson, $h \rightarrow 4f$ [3]. With the help of Monte Carlo program Prophecy 4f 3.0 [4], we calculated the values $\Gamma= \Gamma_{EW} /\left(\Gamma_{EW}+\Gamma_{SM}\right)$ and $\Gamma= \Gamma_{EW+QCD} /\left(\Gamma_{EW+QCD}+\Gamma_{SM}\right)$ for Higgs boson decay 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't find significant difference when accounting QCD corrections to EW processes in the decay modes of Higgs boson.
Using computer programs Pythia 8.2 [5] and FeynHiggs [6] 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 $\sigma(ggH)BR(H \rightarrow ZZ)$ for gluon fusion production process at 13
and 14 TeV and found good agreement with experimental data [7].
References:
1. CMS Collaboration. Measurements of properties of the Higgs boson decaying into four leptons in pp collisions at $\sqrt{s}=13$\ TeV // CMS-PAS-HIG-16-041 (2017).
2. A.Denner, S.Dittmaier, J.-N.Lang. Renormalization of mixing angles // JHEP 2018,11,104, arXiv:1808.03466 [hep-ph].
3. D. de Florian et al. Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector // CERN Report 2017-002 (2016), [arXiv:1610.07922].
4. A.Denner, S.Dittmaier, A.Muck. PROPHECY4F 3.0: A Monte Carlo program for Higgs-boson decays into four-fermion final states in and beyond the Standard Model // FR-PHENO-2019-018, TTK-19-51, arXiv:1912.02010 [hep-ph].
5. T.Sjostrand. An Introduction to PYTHIA 8.2 //
Comput.Phys.Commun. 2015, 191, 159-177, arXiv:1410.3012 [hep-ph].
6. S.Heinemeyer, W.Hollik, G.Weiglein. FeynHiggs: a program for the calculation of the masses of the neutral CP-even Higgs bosons in the MSSM // Comput.Phys.Commun. 2000, 124, 76-89.
7. ATLAS Collaboration. Measurements of gluon-gluon fusion and vector-boson fusion Higgs boson production cross-sections in the
$H\to WW^*\to e\nu\mu\nu$ decay channel in pp collisions at $\sqrt{s}=13$\ TeV with the ATLAS detector // Phys. Lett. 2019, B 789, 508.
