Evidence for Top at CDF

CDF has analysed 19.3 pb1 data collected in 1992-93 looking for standard model tt pairs in the dilepton (ee, mm, em )and single lepton (e,m) + jets modes. In three analyses,an excess of rate is found over expected background.One finds that the observed rate is 2,8 sigma away from background expectation. An additional anlysis studied the single lepton + jets channel with optimized cuts on jet angle and energies to enhance the top signal. The Et structure of the selected events does not fit with background and is as expected for top. The tt production cross section is found to be consistent with the QCD predictions.Seven tagged events with 4 or more jets allow to reconstruct the top mass. One finds mtop = 174±17 GeV/c2.