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Leptoquarks (LQs) are predicted within Grand Unified Theories and are wellmotivated by the current flavor anomalies. In this article we investigate theimpact of scalar LQs on Higgs decays and oblique corrections as complementaryobservables in the search for them. Taking into account all five LQrepresentations under the Standard Model gauge group and including the mostgeneral mixing among them, we calculate the effects in $h\to\gamma\gamma$,$h\to gg$, $h \to Z \gamma$ and the Peskin-Takeuchi parameters $S$, $T$ and$U$. We find that these observables depend on the same Lagrangian parameters,leading to interesting correlations among them. While the current experimentalbounds only yield weak constraints on the model, these correlations can be usedto distinguish different LQ representations at future colliders (ILC, CLIC,FCC-ee and FCC-hh), whose discovery potential we are going to discuss.

Leptoquarks in Oblique Corrections and Higgs Signal Strength: Status and Prospects