On the two-loop BSM corrections to h\longrightarrowγγ in the aligned THDM

2023/07/05 by Degrassi, Giuseppe, Slavich, Pietro · 1 citation
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2307.02476

Abstract

We compute the two-loop BSM contributions to the h\longrightarrow γγ 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 hγγ 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 Γ[h→ γγ] in scenarios where the quartic Higgs couplings are large.

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