Speaker
Description
Effective field theories (EFTs) offer a rationale to classify new physics models based on the size of their contribution to the effective Lagrangian, and therefore to experimental observables. However, given the amount of UV theories, it is in practice difficult to identify the set of UV theories which can generate a particular low-energy pattern. While current matching softwares have made the top-down approach (once you have chosen a model) much more systematic, starting instead from a Wilson Coefficient and identifying the specific theories from which it can arise is still challenging. Dictionaries, which allow us to systematically go from EFT to the UV are the solution for this. In this talk I will present the first one-loop UV/IR dictionary of the complete SMEFT for extensions encompassing an arbitrary number of scalars and fermions. This dictionary is encoded in a Mathematica package called SOLD (SMEFT One Loop Dictionary), which includes further functionalities to facilitate the usage of the results. I will go over the relevance of dictionaries for phenomenological efforts and explore a particular scenario of how SOLD can help identify the UV source of an existing experimental tension.
