Search for Anomalous Production of Multilepton Events 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>

We report a search for the anomalous production of events with multiple charged leptons in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ using a data sample corresponding to an integrated luminosity of $346\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ collected by the CDF II detector at the Fermilab Tevatron. The search is divided into three-lepton and four-or-more-lepton data samples. We observe six events in the three-lepton sample and zero events in the $\ensuremath{\ge}4$-lepton sample. Both numbers of events are consistent with standard model background expectations. Within the framework of an $R$-parity-violating supergravity model, the results are interpreted as mass limits on the lightest neutralino (${\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0}$) and chargino (${\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{\ifmmode\pm\else\textpm\fi{}}$) particles. For one particular choice of model parameters, the limits are $M({\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{0})>110\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ and $M({\stackrel{\texttildelow{}}{\ensuremath{\chi}}}_{1}^{\ifmmode\pm\else\textpm\fi{}})>203\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ at 95% confidence level; the variation of these mass limits with model parameters is presented.

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