Interpreting the indications of a 95 GeV Higgs Boson through a 2-Higgs Doublet Model

Belyaev, A., Benbrik, R., Boukidi, Mohammed, Chakraborti, M., Moretti, S. and Semlali, S. (2025) Interpreting the indications of a 95 GeV Higgs Boson through a 2-Higgs Doublet Model. Tayalati, Yahya and Gouighri, Mohamed (eds.) In The First African Conference on High Energy Physics: Proceedings of ACHEP, 2023. vol. 425, Springer Cham. pp. 165-172 . (doi:10.1007/978-3-031-88933-2_27).

Abstract

In this study, we investigate the excesses in di-photon and di-tau invariant mass distributions at 95 GeV, as reported by the CMS collaboration at the Large Hadron Collider (LHC), and the long-standing discrepancy in the bb̄ invariant mass observed at the Large Electron-Positron (LEP) collider. Our analysis within the framework of the Type-III 2-Higgs Doublet Model (2HDM) reveals that these anomalies across different channels can be simultaneously explained at 1.3σ Confidence Level (C.L.) by the lightest CP-even Higgs boson while satisfying up-to-date theoretical and experimental constraints. Furthermore, the Type-III 2HDM predicts an excess in the pp→tt̄hSMproduction rate for the 125 GeV Higgs boson. This effect is caused by a up to 11.5% enhancement of the Yukawa coupling to top (anti)quarks in comparison to the Standard Model (SM) value. Such an effect can be tested soon at the High Luminosity LHC (HL-LHC), which can either discover or exclude the scenario we suggest. This unique characteristic of the 2HDM Type-III makes this scenario with the 95 GeV resonance interesting for further theoretical and experimental investigations at the (HL-)LHC and future colliders.

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Contributors

Author: A. Belyaev

Author: S. Moretti

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