Speaker
Description
We study the phenomenology of charged Higgs bosons ($H^\pm$) and Vector-Like Quarks (VLQs), denoted as $T$, with a charge equal to the top quark, within the Two Higgs Doublet Model Type-II (2HDM-II) framework. We examine two scenarios: one with a singlet $(T)$ (2HDM-II+$(T)$) and another with a doublet $(TB)$ (2HDM-II+$(TB)$). We find that VLQs significantly influence the 2HDM-II's (pseudo)scalar sector, notably easing the stringent mass constraints on the charged Higgs boson from $B$-physics observables like $B\to X_s\gamma$, due to altered charged Higgs couplings to SM top and bottom quarks. The impact differs between the singlet and doublet scenarios. We also explore the effects of oblique parameters $S$ and $T$ on VLQ mixing angles and present insights into VLQ $T$ pair production leading to a $2t4b$ final state, offering guidance for extended Higgs and quark sector searches at the LHC.
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