Summary:

The Drell-Yan processes pp->ll and pp->lnu at high transverse momentum can provide important probes of semileptonic transitions that are complementary to low-energy flavor physics observables. We derive constraints on the New Physics contributions to these processes by recasting the latest ATLAS and CMS searches for mono- and di-lepton resonances. We then study the interplay between low-energy observables and collider constraints, using the "HighPT" package. Moreover, we investigate the limits of validity of the Standard Model Effective Field Theory (SMEFT) in these regimes by comparing the constraints obtained for some explicit tree-level mediators and their EFT equivalent.

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