Search for the supersymmetric partner of the top quark in pp¯ collisions at s=1.96 TeV

Le résumé fourni par la source

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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