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A measurement is presented of the effective leptonic weak mixing angle($\sin^2\theta^{\ell}_{\text{eff}}$) using the forward-backward asymmetry ofDrell-Yan lepton pairs ($\mu\mu$ and ee) produced in proton-proton collisionsat $\sqrt{s}=$ 8 TeV at the CMS experiment of the LHC. The data correspond tointegrated luminosities of 18.8 and 19.6 fb$^{-1}$ in the dimuon and dielectronchannels, respectively, containing 8.2 million dimuon and 4.9 milliondielectron events. With more events and new analysis techniques, includingconstraints obtained on the parton distribution functions from the measuredforward-backward asymmetry, the statistical and systematic uncertainties aresignificantly reduced relative to previous CMS measurements. The extractedvalue of $\sin^2\theta^{\ell}_{\text{eff}}$ from the combined dilepton data is$\sin^2\theta^{\ell}_{\text{eff}} =$ 0.23101 $\pm$ 0.00036 (stat) $\pm$ 0.00018(syst) $\pm$ 0.00016 (theo) $\pm$ 0.00031 (parton distributions in proton) =0.23101 $\pm$ 0.00053.

Measurement of the weak mixing angle using the forward-backward asymmetry of Drell-Yan events in pp collisions at 8 TeV