The Universal One-Loop Effective Action
Jérémie Quevillon (King's College London)

In this talk, we present the universal one-loop effective action obtained by integrating out massive, non- degenerate multiplets, focusing on the coefficients of operators of dimension up to six composed of Standard Model fields. Our general results may be applied to loops of non-degenerate heavy fermions or bosons. We discuss the relationship of our results to the SM Effective Field Theory. As an example, we apply our method to the general MSSM with non-degenerate stop squarks.
We then discuss the present and possible future indirect constraints on stop masses.