Search for high–mass dilepton resonances with 5 fb−1 of pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment

This note reports on a search for narrow high-mass resonances decaying into dilepton final states. The data, recorded by the ATLAS experiment in pp collisions at sqrt(s) = 7 TeV at the Large Hadron Collider (LHC), correspond to a total integrated luminosity of 4.9 (5.0) fb−1 in the e+ e− (µ+ µ−) channel. No statistically significant excess above the Standard Model expectation is observed, and upper limits are set at the 95% confidence level on the cross section times branching fraction of Z' resonances and Randall-Sundrum gravitons decaying into dileptons as a function of the resonance mass. A lower limit of 2.21 TeV on the mass of the Sequential Standard Model Z' boson is set. A Randall-Sundrum graviton with coupling k/M_Pl = 0.1 is excluded at 95% confidence level for masses below 2.16 TeV.