Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 64: Search for New Particles 5

T 64.6: Vortrag

Mittwoch, 23. März 2022, 17:30–17:45, T-H23

Search for charged Higgs bosons in H⁺→ Wh→ lν bb decays with the ATLAS detector — Dominik Duda, •Simon Grewe, Sandra Kortner, and Hubert Kroha — Max-Planck-Institut für Physik, München

Various theories predicting an extended Higgs sector predict also the existence of at least one set of charged Higgs bosons. The main production mode of these new particles depends on their mass. For charged Higgs boson masses larger than the sum of the top and the bottom quark mass, the dominant production mode is expected to be in association with a top quark and a bottom quark (tbH⁺).

In the alignment limit of the two-Higgs-Doublet Model (2HDM), heavy charged Higgs bosons with m(H⁺)>m(t)+m(b) decay almost exclusively via H⁺→ tb. However, in other models such as the Next-to-two-Higgs-Doublet Model (N2HDM), the three-Higgs-Doublet model (3HDM) or in Higgs triplet models (e.g. Georgi-Machacek model), significant branching ratios for H⁺→ W⁺h are possible. The latter decay mode has so far been covered neither by ATLAS nor CMS.

We present first studies on the search for H⁺→ W⁺h→ ℓν bb decays in final states with the resolved topology containing five or more jets, one charged lepton and missing transverse momentum. A multiclass classifier is used to separate the semileptonic H⁺→ lν bb and fully hadronic H⁺→ qq bb decay modes from the dominant background processes. The reconstruction of the charged Higgs boson decay is performed using boosted decision trees (BDTs).