Searching for narrow graviton resonances with the ATLAS detector at the large hadron collider

A spectrum of massive graviton states is present in several recenttheoretical models that include extra space dimensions. In some such models thegraviton states are well separated in mass, and can be detected as resonancesin collider experiments. The ability of the ATLAS detector at the Large HadronCollider to identify such states and measure their properties is considered, inthe case that the resonances are narrow compared to the experimentalresolution. The discovery limits for the detection of the decay mode G->e+e-are derived. The angular distribution of the lepton pair is used to determinethe spin of the intermediate state. In one specific model, the resonance can bedetected up to a graviton resonance mass of 2080 GeV, while the angulardistribution favours a spin-2 hypothesis over a spin-1 hypothesis at 90%confidence for resonance masses up to 1720 GeV.Comment: 12 pages, 5 figures. v2 has corrected cross-sections leading to favourable quantitative changes to result