Precision Measurements of the Electroweak Mixing Angle in the Region of the Z pole

We review the current status and techniques used in precision measurements of the effective leptonic weak mixing angle  sin² θ^ℓ_eff  (a fundamental parameter of the Standard Model (SM)) in the region of the Z pole with emphasis on hadron colliders. We build on these techniques to extract the most precise single measurement to date of in² θ^ℓ_eff  from a new analysis of the published forward-backward asymmetry (AFB) in Drell-Yan dielpton production in proton-proton collisions at a center of mass energy of 13 TeV measured by the CMS collaboration at the large hadron collider. The uncertainty in in² θ^ℓ_eff. published by CMS is dominated by uncertainties in Parton Distribution Functions (PDFs), which are reduced by PDF profiling using the dilepton mass dependence of  A_FB. Our new extraction ofin² θ^ℓ_eff from the CMS values of A_FB includes profiling with additional new CMS measurements of the W-boson decay lepton asymmetry, and W/Z cross section ratios. We obtain the most precise single measurement of in² θ^ℓ_eff to date of 0.23156±0.00024, which is in excellent agreement with the SM prediction of 0.23161±0.00004.