Search for Resonances in the Dilepton Mass Distribution in pp Collisions at sqrt(s) = 7 TeV

A search for narrow resonances at high mass in the dimuon and dielectron channels has been performed by the CMS experiment at the CERN LHC, using $\mathrm{pp}$ collision data recorded at $\sqrt{s}=7$~TeV. The event samples correspond to an integrated luminosity of \anaLumi. Heavy dilepton resonances are predicted in theoretical models with extra gauge bosons ($\mathrm{Z}^\prime$) or as Kaluza--Klein graviton excitations ($\mathrm{G}_\mathrm{KK}$) in the Randall-Sundrum model. Upper limits on the inclusive cross section of $\mathrm{Z}^\prime(\mathrm{G}_\mathrm{KK})\rightarrow\ell^+\ell^-$ relative to $\mathrm{Z}\rightarrow\ell^+\ell^-$ are presented. These limits exclude at 95\% confidence level a $\mathrm{Z}^\prime$ with standard-model-like couplings below \limitZssm\GeV, the superstring-inspired $\mathrm{Z}^\prime_\psi$ below \limitZpsi\GeV, and, for values of the coupling parameter $k/\overline{M}_{\rm Pl}$ of 0.05 (0.1), Kaluza--Klein gravitons below \limitGlow\ (\limitGhigh)\GeV.