  A measurement of the lepton charge asymmetry in inclusive pp to WX production
at sqrt(s)= 7 TeV is presented based on data recorded by the CMS detector at
the LHC and corresponding to an integrated luminosity of 36 inverse picobarns.
This high precision measurement of the lepton charge asymmetry, performed in
both the W to e nu and W to mu nu channels, provides new insights into parton
distribution functions.
