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arXiv · 2608.17126

Forward--backward asymmetry in the $H\to Zγ\to\overline{f}{f}γ$ decay

A. I. Hernández-Juárez·G. Tavares-Velasco·A. Fernández-Téllez·D. Watko
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Abstract

We study the forward--backward asymmetry in the three-body decay process $H\to Zγ\to\overline{f}fγ$, induced by complex form factors in the $HZγ$ vertex. To estimate its magnitude, we derive constraints on the real and imaginary parts of the $CP$-violating form factor $h_3^{Zγ}$ using current LHC measurements, obtaining upper limits of about $0.9$ GeV. These bounds are of the same order of magnitude as those derived from electric dipole moments (EDM). We find that the asymmetry can reach values of order $10^{-1}$ and may be accessible at the HL-LHC.

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A. I. Hernández-Juárez, G. Tavares-Velasco, A. Fernández-Téllez, D. Watko. 2026-08-17. Forward--backward asymmetry in the $H\to Zγ\to\overline{f}{f}γ$ decay. https://doi.org/10.1103/7ctd-6fmw

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