Search for the supersymmetric partner of the top quark 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 present a search for the lightest supersymmetric partner of the top quark in proton-antiproton collisions at a center-of-mass energy $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$. This search was conducted within the framework of the $R$ parity conserving minimal supersymmetric extension of the standard model, assuming the stop decays dominantly to a lepton, a sneutrino, and a bottom quark. We searched for events with two oppositely-charged leptons, at least one jet, and missing transverse energy in a data sample corresponding to an integrated luminosity of $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by the Collider Detector at Fermilab experiment. No significant evidence of a stop quark signal was found. Exclusion limits at 95% confidence level in the stop quark versus sneutrino mass plane are set. Stop quark masses up to $180\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ are excluded for sneutrino masses around $45\text{ }\text{ }\mathrm{GeV}/{c}^{2}$, and sneutrino masses up to $116\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ are excluded for stop quark masses around $150\text{ }\text{ }\mathrm{GeV}/{c}^{2}$.

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