  Effective field theory tools are essential for exploring non-Standard Model
physics at the LHC in the absence of the discovery of new light particles.
Predictions for observables are typically made at the lowest order in the QCD
and electroweak expansions in the Standard Model effective field theory (SMEFT)
and often ignore the effects of flavor. Here, we present results for
electroweak precision observables (EWPOs)at the next-to-leading order QCD and
electroweak expansions (NLO) of the SMEFT with an arbitrary flavor structure
for the fermion operators. Numerical NLO SMEFT fits toEWPOs have a strong
dependence on the assumed flavor structures and we demonstrate this using
various popular assumptions for flavor symmetries.
