The "96 GeV excess" at the LHC

Abstract

The CMS collaboration reported an intriguing \sim 3 sigma (local) excess at 96 GeV in the light Higgs-boson search in the diphoton decay mode. This mass coincides with a \sim 2 sigma (local) excess in the bb final state at LEP. We briefly review the proposed combined interpretations for the two excesses. In more detail we review the interpretation of this possible signal as the lightest Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). We show which channels have the best prospects for the discovery of additional Higgs bosons at the upcoming Run 3 of the LHC.

7 pages, 1 figure. Talk presented at the IAS Program on High Energy Physics (HEP) 2020. These proceedings complement with new material the original paper, arXiv:1903.11661, and the subsequent arXiv:1910.06858, arXiv:2002.06904. On popular demand we have included again a list of models explaining the excesses

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• Scrutinizing the 95-100 GeV di-tau excess in the top associated process
• Scotogenic $U(1{)}_{L_{\mu }-L_{\tau }}$ origin of $(g-2{)}_{\mu }$, W-mass anomaly and 95 GeV excess
• Dark Matter Phenomenology in 2HDMS in light of the 95 GeV excess
• Phenomenology of a Supersymmetric Model Inspired by Inflation
• 95 GeV excess in a $CP$-violating $\mu$-from-$\nu$ SSM
• 95 GeV light Higgs in the top-pair-associated diphoton channel at the LHC in the minimal dilaton model
• Interpretation of 95 GeV Excess within the Georgi-Machacek Model in Light of Positive Definiteness Constraints
• Explaining excesses in four-leptons at the LHC with a double peak from a CP violating Two Higgs Doublet Model
• 96 GeV Scalar Boson in the 2HDM with U(1)_H Gauge Symmetry
• Testing a 95 GeV Scalar at the CEPC with Machine Learning
• Higgs sector phenomenology in the 3-3-1 model with an axionlike particle
• Particle-level transformers for 95 GeV Higgs boson searches at future $e^{+}{e}^{-}$ Higgs factories
• Confronting the broken phase N2HDM with Higgs Data
• Phenomenology of the standard HVM and 95.4 GeV excess
• Mounting evidence for a 95 GeV Higgs boson
• Search for Dark Matter in 2HDMS at LHC and future Lepton Colliders