Probing the general 2HDM with flavor violation through $A \to ZH$

Wei-Shu Hou; Mohamed Krab

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arXiv · 2503.23133

Probing the general 2HDM with flavor violation through $A \to ZH$

Wei-Shu Hou·Mohamed Krab

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Abstract

We investigate the LHC discovery prospects for a second Higgs doublet through $A \to ZH$ weak decay. The latter is identified as the $\textit{smoking gun signature}$ of two Higgs doublet models (2HDMs) with first-order electroweak (EW) phase transition, a necessary condition for EW baryogenesis. In the general 2HDM (G2HDM) that has flavor-changing neutral Higgs couplings, $H$ may decay dominantly via $t\bar c + \bar tc$ final states, giving rise to trilepton signals. By a phenomenological analysis, we show that $A \to ZH$ in $\ell^+ \ell^- t\bar c$ or $\ell^+ \ell^- \bar t c$ final states could be a promising probe of G2HDM at the LHC with flavor violation.

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Wei-Shu Hou, Mohamed Krab. 2025-03-29. Probing the general 2HDM with flavor violation through $A \to ZH$. https://arxiv.org/abs/2503.23133

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