Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 25: Higgs Physics IV (BSM Higgs)
T 25.5: Vortrag
Dienstag, 1. April 2025, 17:15–17:30, ZHG105
Searches for charged Higgs bosons in H±→ W±h decays with the ATLAS detector — Dominik Duda2, •Simon Grewe1, Sandra Kortner1, and Hubert Kroha1 — 1Max Planck Institut für Physik — 2University of Edinburg
Many theories beyond the Standard Model predict the existence of charged Higgs bosons. The main production mode of these new particles depends on their mass. For large H± masses, the dominant mode of production is in association with a top quark and a bottom quark (tbH±). In the alignment limit of the Two-Higgs-Doublet Model, heavy charged Higgs bosons decay almost exclusively via H±→ tb. In other models such as the Georgi-Machacek model, however, significant branching ratios for H±→ W±h are possible.
A search for charged Higgs bosons in H±→ W±h (mh=125 GeV) decays produced in association with a top and bottom quark is presented, based on the full Run-2 dataset of the ATLAS experiment. This is the first search for this decay at the LHC.
Two analysis strategies are employed to ensure high sensitivity for both low and high H± masses. For low H± masses the decay products have a relatively low Lorentz-boost and the h→ bb can be resolved by two small-radius jets. For high H± masses the final state particles acquire a lot of Lorentz-boost and the neutral Higgs boson decay has to be reconstructed via a single large-radius jet.
The invariant mass of the charged Higgs boson is reconstructed and used as the discriminating variable.
No significant deviation from the SM expectation is observed and upper limits are set on σ(p p→ tbH±)× BR(H±→ W±h).