Dilepton Forward-Backward Asymmetry and electroweak mixing angle at ATLAS and CMS

We present measurements of the forward-backward asymmetry in Drell-Yan dilepton ( ee and μ μ ) events with the data sample of pp collisions at √ s = 7 TeV and 8 TeV collected by ATLAS and CMS detector. At CMS, the measurements are extended up to the boson rapidity, | y | =5, by including forward electrons. At ATLAS, the measured forward-backward asymmetry is used to extract the effective electroweak mixing angle, sin 2 θ lept e f f . The measured sin 2 θ lept e f f from combining all channels is 0.2308 ± 0.0005(stat.) ± 0.0006(syst.) ± 0.0009(PDF)