SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 56: Searches EW I

T 56.1: Vortrag

Mittwoch, 22. März 2023, 15:50–16:05, HSZ/0403

Search for charged Higgs bosons in H⁺ → Wh decays with the ATLAS detector — •Shubham Bansal, Jochen Dingfelder, and Tatjana Lenz — Physikalisches Institut, University of Bonn, Germany

After the discovery of the Higgs boson at a mass of 125 GeV, the last missing piece of the Standard Model (SM) was presumably found. However, various theories beyond the SM predict additional Higgs bosons, one of which could be the observed Higgs boson at 125 GeV. One such example is the Two-Higgs-Doublet Model (2HDM) that features an extended scalar sector including the existence of charged Higgs bosons (H⁺). The H⁺ production mechanism depends on its mass (m_H⁺) and for m_H⁺> m_t+m_b, the leading H⁺ production mode is the associated production with a top and a bottom quark via gg → tbH⁺. In the alignment limit for 2HDM, the dominant decay mode is H⁺→ tb. However, in models like N2HDM and the Georgi-Machacek (GM) model, it is possible to obtain a sizable branching ratio for H⁺→ Wh.

This talk presents a search for charged Higgs bosons in H⁺→ Wh(→ bb) decays. The analysis strategy is presented and a focus is put on the data-driven improvements of the modelling of the main background from tt production, the event classification technique to separate the leptonic and hadronic decay modes of the W boson from the H⁺ decay. Finally, the fit model is discussed to derive the first estimate of the expected sensitivity for the full Run-2 ATLAS dataset.