Measurement of the $W$ Charge Asymmetry in the $W \rightarrow μν$ Decay Mode in $pp$ Collisions at $\sqrt{s} = 7$ TeV with the ATLAS detector

The ATLAS Collaboration

Paper

Measurement of the $W$ Charge Asymmetry in the $W \rightarrow μν$ Decay Mode in $pp$ Collisions at $\sqrt{s} = 7$ TeV with the ATLAS detector

Abstract

This letter reports a measurement of the muon charge asymmetry from

bosons produced in proton-proton collisions at a centre-of-mass energy of 7 TeV with the ATLAS experiment at the LHC. The asymmetry is measured in the

decay mode as a function of the muon pseudorapidity using a data sample corresponding to a total integrated luminosity of 31 pb

. The results are compared to predictions based on next-to-leading order calculations with various parton distribution functions. This measurement provides information on the

and

quark momentum fractions in the proton.