  We study the impact of LHC forward-backward asymmetry (AFB) measurements at
high invariant-mass in the Drell-Yan process on probes of semileptonic
four-fermion operators in the Standard Model effective field theory (SMEFT). In
particular, we study whether AFB measurements can resolve degeneracies in the
Wilson coefficient parameter space that appear when considering invariant-mass
and rapidity measurements alone. We perform detailed fits of the available
high-energy and high-luminosity ATLAS and CMS data for both invariant-mass
distributions and AFB. While each type of measurement separately exhibits
degeneracies, combining them removes these blind spots in some cases. In other
situations it does not, highlighting the importance of incorporating future
datasets from other experiments to fully explore this sector of the SMEFT. We
investigate the impact of contributions quadratic in the Wilson coefficients on
the description of Drell-Yan data and discuss when such terms are important in
joint fits of the AFB and invariant-mass data.
