  This article presents a search for high mass e e or mu mu resonances in pp
collisions at sqrt{s} = 7 TeV at the LHC. The data were recorded by the ATLAS
experiment during 2010 and correspond to a total integrated luminosity of
~40/pb. No statistically significant excess above the Standard Model
expectation is observed in the search region of dilepton invariant mass above
110 GeV. Upper limits at the 95% confidence level are set on the cross section
times branching ratio of Z' resonances decaying to dielectrons and dimuons as a
function of the resonance mass. A lower mass limit of 1.048 TeV on the
Sequential Standard Model Z' boson is derived, as well as mass limits on Z* and
E(6)-motivated Z' models.
