Measurement of $W\rightarrow \ell \nu$ charge asymmetry in proton-proton collisions at $\sqrt{s}=7$~TeV with the ATLAS detector

We present a measurement of the asymmetry in the production rates of positively and negatively charged $W$ bosons in $pp$ collisions at $\sqrt{s}=7$~TeV with the ATLAS detector. The $W$ candidates are reconstructed in the $\ell \nu$ final state, where $\ell=e,\mu$. In a sample corresponding to a total integrated luminosity of $35$ pb$^{-1}$, the differential charge asymmetry as a function of the pseudorapidity $\eta$ of the decay lepton is measured. The lepton charge asymmetry is compared to Standard Model predictions using different parton distribution function predictions.