摘要
We analyze the CMS-reported (Formula presented) excess within conventional Two-Higgs-Doublet Models (2HDMs) of Types I, II, X, and Y, using the best-fit pseudoscalar parameters (Formula presented) GeV, (Formula presented), and (Formula presented). Applying theoretical and experimental constraints–including stability, unitarity, perturbativity, FCNCs, and collider bounds–we find perturbativity limits MH± and M
to below about 723 GeV. FCNC constraints exclude Types II and Y, while the remaining parameter space in Types I and X is ruled out by recent (Formula presented) measurements from ATLAS and CMS. We conclude that conventional 2HDMs are strongly disfavored by the observed (Formula presented) excess; however, the inclusion of toponium effects in the background modeling may potentially alter this conclusion.