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arXiv · 2604.07161

Impact of hidden heavy Higgs channels of VLB-Quarks below 1 TeV in 2HDM

Rachid Benbrik·Mbark Berrouj·Mohammed Boukidi·Mohamed Ech-chaouy·Kholoud Kahime·Khawla Salime
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Abstract

We investigate the phenomenological impact of incorporating vector-like bottom (VLB) quarks into the Type-II Two-Higgs-Doublet Model (2HDM-II). This framework introduces novel beyond-Standard-Model (BSM) decay channels $B \to Hb$, $B \to Ab$, and $B \to H^-t$, which are typically ignored by LHC pair-production searches focused on Standard Model (SM) final states ($B \to Zb$, $B \to hb$, $B \to Wt$). Our analysis reveals that these BSM pathways significantly weaken current VLB mass constraints. In the 2HDM-II alignment limit, the mass limit for a singlet $B$ shifts from approximately 1.5 TeV down to 1.34 TeV. For $(T, B)$ and $(B, Y)$ doublet configurations, the mass limits relax further to approximately 0.98 TeV, driven by the dominance of $B \to Hb$ and $B \to Ab$ decays, which can reach combined branching ratios of nearly 100\%.

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Rachid Benbrik, Mbark Berrouj, Mohammed Boukidi, Mohamed Ech-chaouy, Kholoud Kahime, Khawla Salime. 2026-04-08. Impact of hidden heavy Higgs channels of VLB-Quarks below 1 TeV in 2HDM. https://doi.org/10.1016/j.nuclphysb.2026.117436

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