Search for High-Mass<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Resonances in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>1.96</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>

A search for high-mass resonances in the ${e}^{+}{e}^{\ensuremath{-}}$ final state is presented based on $2.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ $p\overline{p}$ collision data from the CDF II detector at the Fermilab Tevatron. The largest excess over the standard model prediction is at an ${e}^{+}{e}^{\ensuremath{-}}$ invariant mass of $240\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. The probability of observing such an excess arising from fluctuations in the standard model anywhere in the mass range of $150--1000\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ is 0.6% (equivalent to $2.5\ensuremath{\sigma}$). We exclude the standard model coupling ${Z}^{\ensuremath{'}}$ and the Randall-Sundrum graviton for $k/{\overline{M}}_{\mathrm{Pl}}=0.1$ with masses below 963 and $848\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ at the 95% credibility level, respectively.

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