Search for New Dielectron Resonances and Randall-Sundrum Gravitons at the Collider Detector at Fermilab

A search for new dielectron mass resonances using data recorded by the CDF II detector and corresponding to an integrated luminosity of 5.7 fb−1 is presented. No significant excess over the expected standard model prediction is observed. In this dataset, an event with the highest dielectron mass ever observed (960 GeV/c) was recorded. The results are interpreted in the Randall-Sundrum (RS) model. Combined with the 5.4 fb−1 diphoton analysis, the RS-graviton mass limit for the coupling k/MPl = 0.1 is 1058 GeV/c , making it the strongest limit to date.