Scalar leptoquark contributions to the g g → Z h process

In this manuscript, we study the general scalar leptoquark contributions to the g g → Z h process at a 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 + R ˜ 2 + S 3 model, which can appear in the presence of scalar leptoquark mass splittings and C P 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.