Explanation of the 95 GeV $\gamma \gamma$ and $b\bar{b}$ excesses in the Minimal Left-Right Symmetric Model

Abstract

We propose a simple interpretation of the $\gamma \gamma$ excesses reported by both CMS and ATLAS groups at 95 GeV together with the LEP excess in the $Zb\bar{b}$ channel around the same mass in terms of a neutral scalar field in the minimal left-right symmetric model (LRSM). We point out that the scalar field which implements the seesaw mechanism for neutrino masses has all the right properties to explain these observations, without introducing any extra scalar fields. The key point is that this scalar particle is hardly constrained because it couples only to heavy right-handed particles. As a result, the diphoton decay mode receives contributions from both mixing with the Standard Model (SM) Higgs and the heavy charged bosons in the LRSM, depending on the $SU(2{)}_R\times U(1{)}_{B-L}$ symmetry breaking scale $v_R$. The complete allowed parameter space for explaining the 95 GeV excesses in this model can be probed with the high-precision measurements of the SM Higgs mixing with other scalars at the high-luminosity LHC and future Higgs factories.

arXiv comment9 pages + references, 6 figures; minor changes, version published in Phys. Lett. B

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• Explaining 95 GeV Anomalies in the 2-Higgs Doublet Model Type-I
• Probing Type-I 2HDM light Higgs in the top-pair-associated diphoton channel
• Bayesian Active Search on Parameter Space: a 95 GeV Spin-0 Resonance in the ($B-L$)SSM
• Testing a 95 GeV Scalar at the CEPC with Machine Learning
• 96 GeV Scalar Boson in the 2HDM with U(1)_H Gauge Symmetry
• Interpreting the 650 GeV and 95 GeV Higgs anomalies in the next-to-two-Higgs-doublet model
• Particle-level transformers for 95 GeV Higgs boson searches at future $e^{+}{e}^{-}$ Higgs factories
• Interpretation of LHC excesses at 95 GeV and 152 GeV in an extended Georgi-Machacek model
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