Speaker
Description
Standard Model Effective Field Theory (SMEFT) provides a robust approach to explore short-distance new physics effects in a model-independent way. One of the inherent shortcomings of SMEFT is the number of independent parameters, which need to be taken into account to perform the SMEFT analysis in full generality. In this presentation, some of the well-motivated options to reduce the number of independent parameters by means of flavor symmetries are explored, providing a very useful organizing principle. Moreover, this approach is then also applied to the new spin-0, 1/2, and 1 fields, which integrate out to the dimension-6 SMEFT operators at tree level. The full classification of these mediators under the $U(3)^5$ flavor symmetry is performed. Additionally, once integrated out, the vast majority of flavor-symmetric interactions predict a single SMEFT operator with a definite sign, and these operators are referred to as leading SMEFT directions. Utilizing the available SMEFT fits, bounds for various mediators entering the leading directions can be estimated.
