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A search for high-mass resonances in the $e^+e^-$ final state is presentedbased on 2.5 fb$^{-1}$ of $\sqrt{s}=$1.96 TeV $p\bar{p}$ collision data fromthe CDF II detector at the Fermilab Tevatron. The largest excess over thestandard model prediction is at an $e^+e^-$ invariant mass of 240 GeV/$c^2$.The probability of observing such an excess arising from fluctuations in thestandard model anywhere in the mass range of 150--1,000 GeV/$c^2$ is 0.6%(equivalent to 2.5 $\sigma$). We exclude the standard model coupling $Z'$ andthe Randall-Sundrum graviton for $k/\overline{M}_{Pl}=0.1$ with masses below963 and 848 GeV/$c^2$ at the 95% credibility level, respectively.

Search for High-Mass \boldmath$e^+e^-$ Resonances in \boldmath$p\bar{p}$ Collisions at \boldmath$\sqrt{s}=$1.96 TeV