Top decays in the dilepton channel at CDF

The author presents an observation of t anti t production in the dilepton decay channel using the CDF detector at the Fermilab Tevatron Collider. This measurement was made using ∼ 67 pb-1 of data, 19.3 of which was taken during the 1992--93 data run while the remaining data has been acquired this past year (94--95). He observed 6 events in the t anti t signal region with an expected background of 1.3 ± 0.3 events. This signal is inconsistent with the background prediction by 2.7σ. Additionally, three of these events contain a total of 5 b-tags--strong evidence for WWb production. He measured the t anti t production cross section in the dilepton channel to be σtantit = 10.9-4.5+5.9pb