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arXiv · 2509.26155

Interpreting the 95 GeV di-photon and di-tau Excesses in the Georgi-Machacek Model

Qin Chang·Xiaokang Du·Pengxuan Zhu
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Abstract

We revisit the 95~GeV $\gamma\gamma$ and $\tau\tau$ excesses in the Georgi--Machacek model using a combined fit to a single light $CP$-even custodial singlet $H$. Using the 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 the allowed region $\mu_{\gamma\gamma}$ approaches the experimental central value, while $\mu_{\tau\tau}$ reaches only $\sim0.5$ (about $1.4\sigma$ below the CMS central value) and remains within the $2\sigma$ interval - a good description of the di-photon excess but only a partial accommodation of the di-tau excess. 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 $\kappa_V$ measurements and direct exotic searches.

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Qin Chang, Xiaokang Du, Pengxuan Zhu. 2025-09-30. Interpreting the 95 GeV di-photon and di-tau Excesses in the Georgi-Machacek Model. https://arxiv.org/abs/2509.26155

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