  The t t-bar charge asymmetry in proton-proton collisions at sqrt(s) = 7 TeV
is measured using the dilepton decay channel (ee, e mu, or mu mu). The data
correspond to a total integrated luminosity of 5.0 inverse femtobarns,
collected by the CMS experiment at the LHC. The t t-bar and lepton charge
asymmetries, defined as the differences in absolute values of the rapidities
between the reconstructed top quarks and antiquarks and of the pseudorapidities
between the positive and negative leptons, respectively, are measured to be Ac
= -0.010 +/- 0.017 (stat.) +/- 0.008 (syst.) and Ac[lep] = 0.009 +/- 0.010
(stat.) +/- 0.006 (syst). The lepton charge asymmetry is also measured as a
function of the invariant mass, rapidity, and transverse momentum of the t
t-bar system. All measurements are consistent with the expectations of the
standard model.
