Measurement of the forward-backward asymmetry of electron and muon pair-production in pp collisions at root s=7 TeV with the ATLAS detector
Abstract
This paper presents measurements from the ATLAS experiment of the forward-backward asymmetry in the reaction pp RIGHTWARDS ARROW Z/γ * RIGHTWARDS ARROW l + l MINUS SIGN , with l being electrons or muons, and the extraction of the effective weak mixing angle. The results are based on the full set of data collected in 2011 in pp collisions at the LHC at sSQUARE ROOT=7 TeV, corresponding to an integrated luminosity of 4.8 fbMINUS SIGN 1.
The measured asymmetry values are found to be in agreement with the corresponding Standard Model predictions. The combination of the muon and electron channels yields a value of the effective weak mixing angle of sin2 θ eff lept = 0.2308 +- 0.0005(stat.) +- 0.0006(syst.) +- 0.0009(PDF), where the first uncertainty corresponds to data statistics, the second to systematic effects and the third to knowledge of the parton density functions.
This result agrees with the current world average from the Particle Data Group fit.