Search for single top quark production optimized for s-channel production at CDF

We present a search for single top quark production using 1.7 fb$^{-1}$ of data accumulated with the CDF II detector at the Fermilab Tevatron. We select events with one high-$p_{T}$ lepton, large missing transverse energy and two jets with $b$ tags. One jet must have a $b$ tag using secondary-vertex information and the other jet's $b$ tag may use secondary-vertex or impact-parameter information. The kinematic fitter and the background-separation technique are designed to maximize the sensitivity to s-channel single top production.