Abstract

The Standard Model Effective Field Theory (SMEFT) has become the preferred tool for parameterizing potential beyond the Standard Model physics effects in precision measurements at the LHC . While the observation of a nonzero operator coefficient in the SMEFT would be a clear sign of new physics, gleaning information about the nature of the underlying model at the high scale presents a number of challenges. In this talk, I will discuss recent progress in using SMEFT fits to LHC and electroweak precision data to constrain the parameters of simple extensions of the Standard Model, focusing in particular on the examples of a singlet scalar, a right-handed top partner, and a 2HDM. Focusing on these simple extensions allows us to study the process of extracting limits from SMEFT fits in detail, including the effects of running between the matching scale and the weak scale, the impact of one loop matching contributions, and the relative importance of dimension-8 operators. Including dimension-8 operators highlights interesting subtleties in the matching procedure that can affect the interpretation of SMEFT fit results.