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A 96 GeV Higgs Boson in the 2HDMS: $e^+e^-$ collider prospects

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arxiv 2105.11189 v1 pith:ZKAAGCQS submitted 2021-05-24 hep-ph

classification hep-ph
keywords higgshdmsprospectsbosonexcessexperimentalinterpretationlocal
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

The CMS collaboration reported a $\sim 3 \, \sigma$ (local) excess at $96\;$GeV in the search for light Higgs-boson decaying into two photons. This mass coincides with a $\sim 2 \, \sigma$ (local) excess in the $b\bar b$ final state at LEP. We show an interpretation of these possible signals as the lightest Higgs boson in the 2 Higgs Doublet Model with an additional complex Higgs singlet (2HDMS). The interpretation is in agreement with all experimental and theoretical constraints. We concentrate on the 2HDMS type II, which resembles the Higgs and Yukawa structure of the Next-to Minimal Supersymmetric Standard Model. We discuss the experimental prospects for constraining our explanation at future $e^+e^-$ colliders, with concrete analyses based on the ILC prospects.

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