Search for New Physics in High-Mass Electron-Positron Events inpp¯Collisions ats=1.96TeV

We report the results of a search for a narrow resonance in electron-positron events in the invariant mass range of $150–950\mathrm{GeV}/c^2$ using $1.3{\mathrm{fb}}^{-1}$ of $p\overline{p}$ collision data at $\sqrt{s}=1.96\mathrm{TeV}$ collected by the CDF II detector at Fermilab. No significant evidence of such a resonance is observed and we interpret the results to exclude the standard-model-like $Z^{\prime }$ with a mass below $923\mathrm{GeV}/c^2$ and the Randall-Sundrum graviton with a mass below $807\mathrm{GeV}/c^2$ for $k/{\overline{M}}_{\mathrm{pl}}=0.1$, both at the 95% confidence level. Combining with diphoton data excludes the Randall-Sundrum graviton for masses below $889\mathrm{GeV}/c^2$ for $k/{\overline{M}}_{\mathrm{pl}}=0.1$.