The combined CMS and ATLAS analysis of h→Zγ reveals a 2σ excess over the Standard Model (SM) prediction, hinting at potential new physics. In contrast, the observed agreement of μγγ 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 μWW⋆, μZγ, and μγγ 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.
@article{arxiv.2504.04265,
title = {Higgs Decay Signal Strengths in an Extended 2HDM},
author = {Hrishabh Bharadwaj and Mamta Dahiya and Sukanta Dutta and Ashok Goyal},
journal= {arXiv preprint arXiv:2504.04265},
year = {2025}
}