Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 87: Extended Higgs Models III

T 87.7: Talk

Thursday, March 18, 2021, 17:30–17:45, Tl

Search for charged Higgs bosons in H⁺→ Wh→ lν bb decays with resolved event topology with the ATLAS detector — Patrick Bongratz, 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 N2HDM 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 four or more, well separated jets, one charged lepton and missing transverse momentum. Boosted decision trees (BDTs) are used to solve the jet combinatorics, thus reconstructing the charged Higgs boson decay.