Explaining 650 GeV and 95 GeV anomalies in the 2-Higgs doublet model Type-I

Abstract

We propose an interpretation of a rather significant 650 GeV excess emerged at the Large Hadron Collider (LHC) from CMS Collaboration data in the γγb¯b final state, accompanied by further clusters at 125(90-100) GeV in the γγ(b¯b) system, within the 2-Higgs Doublet Model Type-I (2HDM-I) in presence of a softly broken Z2 symmetry. The underlying process that we probe is gg-initiated production of a CP-odd (or pseudoscalar) Higgs boson A, with mass around 650 GeV, decaying into the Standard Model (SM)-like Higgs state H (decaying into γγ) and a Z boson (decaying into b¯b). We configure this theoretical framework so as to also have in the spectrum a light CP-even (or scalar) Higgs state h with mass around 95 GeV, which is included for the purpose of simultaneously explaining additional data anomalies seen in the b¯b, γγ and τ+τ− final states while searching for light Higgs states at the Large Electron-Positron (LEP) collider (the first one) and LHC (the last two). By accounting for both experimental and theoretical constraints, our results show that the2HDM-I can explain all aforementioned anomalies at a significance level of 2.5σ.

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ORCID for Stefano Moretti: orcid.org/0000-0002-8601-7246

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