| A search for top, anti-top events with a semi-leptonically decaying tau lepton in the final state is presented. The data sample corresponds to an integrated luminosity of 194 pb-1 and was collected with the upgraded Collider Detector at Fermilab using proton, anti-proton collisions at a center-of-mass energy of 1.96 TeV. We observe two events with an expected background of 1.3 +/- 0.3 events. We set a 95% confidence level upper limit on an anomalous rate enhancement factor, rtau < 5.0, consistent with the Standard Model prediction of rtau = 1. |
