Universal Scalar Leptoquark Action for Matching

Understand

In this study we present a universal effective action for one-loop matching of all scalar leptoquarks.

• We use both the Universal One-Loop Effective Action (UOLEA) and covariant diagrams to evaluate the Wilson coefficients directly in the Green basis for up-to dimension-6 operators.
• On the technical side, we use the newly developed method of evaluating supertraces, to further validate the results stemming from the use of covariant diagrams.
• As an application, we perform a fully functional matching onto Standard Model Effective Field Theory (SMEFT) of a model with two scalar leptoquark fields: a weak isospin singlet and a doublet.