Scalar leptoquark contributions to the $gg\to Zh$ process

Abstract

In this manuscript, we study the general scalar leptoquark contributions to the $gg\to Zh$ process at one-loop level. We find that the contributions only show up for the off-diagonal Higgs and $Z$ boson interactions with scalar leptoquarks, which can lead to new tensor structures different from the standard model. In the one-field and two-field models, the contributions vanish exactly; thus, the contributions are possible at least in the three-field models. We exemplify the contributions in the $S_1+{\tilde{R}}_2+S_3$ model, which can appear in the presence of scalar leptoquark mass splittings and $CP$ violation. In view of the heavy scalar leptoquark mass suppression, the leading contributions are typically small and difficult to observe at hadron colliders. However, this work offers a quantitative and systematic investigation of scalar leptoquark contributions, also making it valuable for the new physics studies in other models.

arXiv comment43 pages, 4 captioned figures, 1 table. Match the published version in Physical Review D. Enhance the motivation and improve the presentation. Expand more details on Jarlskog-like invariants. Add analyses from the SMEFT operators. Gain numerical discussions. Suggestions and comments are welcome

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