Measurement of the electron charge asymmetry in inclusive W production in pp collisions at sqrt(s) = 7 TeV

A measurement of the electron charge asymmetry in inclusive $\mathrm{pp}\rightarrow\mathrm{W }+X$ production at $\sqrt{s}= 7\,\mathrm{Te\hspace{-.08em}V} $ is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of $840\ \mathrm{pb}^{-1}$. The electron charge asymmetry is measured in eleven bins of absolute value of lepton pseudorapidity and it varies from 0.102 to 0.224. The total uncertainty on the measured asymmetry ranges between 0.006 and 0.014. This high precision measurement of the electron charge asymmetry provides new constraints into parton distribution functions.