Possible indications for new Higgs bosons in the reach of the LHC: N2HDM and NMSSM interpretations

Abstract

In several searches for additional Higgs bosons at the LHC, in particular in a CMS search exploring decays to pairs of top quarks, $t\bar{t}$, and in an ATLAS search studying tau leptons, ${\tau }^{+}{\tau }^{-}$, local excesses of about $3\sigma$ standard deviations or above have been observed at a mass scale of approximately $400$GeV. We investigate to what extent a possible signal in these channels could be accommodated in the Next-to-Two-Higgs-Doublet Model (N2HDM) or the Next-to Minimal Supersymmetric Standard Model (NMSSM). In a second step we analyze whether such a model could be compatible with both a signal at around $400$GeV and $96$GeV, where the latter possibility is motivated by observed excesses in searches for the $b\bar{b}$ final state at LEP and the di-photon final state at CMS. The analysis for the N2HDM reveals that the observed excesses at $400GeV$ in the $t\bar{t}$ and ${\tau }^{+}{\tau }^{-}$ channels point towards different regions of the parameter space, while one such excess and an additional Higgs boson at around $96$GeV could simultaneously be accommodated. In the context of the NMSSM an experimental confirmation of a signal in the $t\bar{t}$ final state would favour the alignment-without-decoupling limit of the model, where the Higgs boson at $125$GeV could be essentially indistinguishable from the Higgs boson of the standard model. In contrast, a signal in the ${\tau }^{+}{\tau }^{-}$ channel can only be accommodated outside of this limit, and parts of the investigated parameter space could be probed with Higgs signal-rate measurements at the (HL-)LHC.

56 pages, 22 figures, v2: Parts of the discussion moved to the appendix, 2 new plots, matches published version

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