Unified interpretation of 95 GeV di-photon and di-tau Excesses in the Georgi-Machacek Model
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| Format: | Preprint |
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2025
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| _version_ | 1866912984630034432 |
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| author | Chang, Qin Du, Xiaokang Zhu, Pengxuan |
| author_facet | Chang, Qin Du, Xiaokang Zhu, Pengxuan |
| contents | We revisit the 95 GeV excesses in the $γγ$ and $ττ$ channels in the Georgi-Machacek model, where a single light $CP$-even custodial singlet $H$ can account for both hints. Using one-loop renormalization group-improved effective potential and positive-definiteness conditions for vacuum stability, together with perturbative unitarity, electroweak precision tests, $B$-physics, and Higgs data, we identify a narrow but viable parameter region. In this region, charged and doubly charged scalars enhance $H\toγγ$, while the fermionic rescaling controls $H \to ττ$, yielding combined signal strengths compatible at the $2σ$ level. The scenario predicts characteristic patterns in the singlet mixing and triplet vacuum expectation values and is highly testable at the HL-LHC and future lepton colliders via precision $κ_V$ measurements and direct exotic searches. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_26155 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unified interpretation of 95 GeV di-photon and di-tau Excesses in the Georgi-Machacek Model Chang, Qin Du, Xiaokang Zhu, Pengxuan High Energy Physics - Phenomenology We revisit the 95 GeV excesses in the $γγ$ and $ττ$ channels in the Georgi-Machacek model, where a single light $CP$-even custodial singlet $H$ can account for both hints. Using one-loop renormalization group-improved effective potential and positive-definiteness conditions for vacuum stability, together with perturbative unitarity, electroweak precision tests, $B$-physics, and Higgs data, we identify a narrow but viable parameter region. In this region, charged and doubly charged scalars enhance $H\toγγ$, while the fermionic rescaling controls $H \to ττ$, yielding combined signal strengths compatible at the $2σ$ level. The scenario predicts characteristic patterns in the singlet mixing and triplet vacuum expectation values and is highly testable at the HL-LHC and future lepton colliders via precision $κ_V$ measurements and direct exotic searches. |
| title | Unified interpretation of 95 GeV di-photon and di-tau Excesses in the Georgi-Machacek Model |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.26155 |