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arXiv · 2504.04265

Higgs Decay Signal Strengths in an Extended 2HDM

Hrishabh Bharadwaj·Mamta Dahiya·Sukanta Dutta·Ashok Goyal
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Abstract

The combined CMS and ATLAS analysis of \(h \to Z\gamma\) reveals a \(2\sigma\) excess over the Standard Model (SM) prediction, hinting at potential new physics. In contrast, the observed agreement of \(\mu_{\gamma\gamma}\) with the SM imposes stringent constraints on such extension. In this context, we investigate a Two Higgs Doublet Model (2HDM) extended by a complex scalar singlet and a vector-like lepton (VLL). This framework successfully accommodates the Higgs decay signal strengths \(\mu_{{}_{W \,W^\star}}\), \( \mu_{Z\gamma}\,\), and \(\, \mu_{\gamma\gamma}\) while also satisfying precision electroweak constraints, the observed experimental value of muon \(g-2\), and bounds from LEP II data. We identify a viable region of parameter space that is consistent with all low energy data and current experimental limits on the Higgs decay signal strengths.

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Hrishabh Bharadwaj, Mamta Dahiya, Sukanta Dutta, Ashok Goyal. 2025-04-05. Higgs Decay Signal Strengths in an Extended 2HDM. https://arxiv.org/abs/2504.04265

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