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arXiv · 2307.02476

On the two-loop BSM corrections to $h\longrightarrow\gamma\gamma$ in the aligned THDM

Giuseppe Degrassi·Pietro Slavich
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Abstract

We compute the two-loop BSM contributions to the $h\longrightarrow \gamma\gamma$ decay width in the aligned THDM. We adopt the simplifying assumptions of vanishing EW gauge couplings and vanishing mass of the SM-like Higgs boson, which allow us to exploit a low-energy theorem connecting the $h\gamma\gamma$ amplitude to the derivative of the photon self-energy w.r.t. the Higgs field. We briefly discuss the numerical impact of the newly-computed contributions, showing that they may be required for a precise determination of $\Gamma[h\rightarrow \gamma \gamma]$ in scenarios where the quartic Higgs couplings are large.

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Giuseppe Degrassi, Pietro Slavich. 2023-07-05. On the two-loop BSM corrections to $h\longrightarrow\gamma\gamma$ in the aligned THDM. https://arxiv.org/abs/2307.02476

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