Abstract

The top-down matching of specific scenarios for new physics onto the Standard Model Effective Field Theory (SMEFT) is well-understood and easy to automise. The inverse approach, however, the bottom-up matching of the SMEFT to UV models and in particular a systematic exploration of these discoverable UV models is more difficult. I will present a diagrammatic technique to construct in an automated way a complete (under certain, well specified assumptions) set of possible UV models that produce specific groups of SMEFT operators. As an illustration I will focus on generating models with no tree-level contributions to four-fermion (4F) operators. Those scenarios, which only contribute to 4F operators at one-loop order, can contain relatively light particles that could be discovered at the LHC in direct searches and lead to an interesting interplay between indirect SMEFT and direct searches. As an example I will discuss minimal models for 4F operators, their matching to the SMEFT and their role in the interplay between direct and indirect searches at the LHC .