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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 \(b\bar b\) 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 1.3 \(\sigma \) 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 \(pp\to t\bar t h_{\mathrm {SM}}\) production 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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Interpreting the Indications of a 95 GeV Higgs Boson Through a 2-Higgs Doublet Model

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  • 出版模式：

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  • 发表日期：

    2026年

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  • A. Belyaev,
  • R. Benbrik,
  • Mohammed Boukidi,
  • M. Chakraborti,
  • S. Moretti,
  • S. Semlali

摘要

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 \(b\bar b\) 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 1.3 \(\sigma \) 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 \(pp\to t\bar t h_{\mathrm {SM}}\) production 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.