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Measurement of the T[bar T] Cross Section At[radical]

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A measurement of the t[bar t] cross section at[radical]s= 1.96 TeV is carried out on data samples of[approx]40 pb[sup -1] in dilepton channels (e[mu], ee and[mu][mu]) and lepton+jets channels using two complementary approaches: a fully topological analysis and a soft-muon-tag. Overall, 17 events are observed with an expected background of 6.5[+-] 0.6. This excess corresponds to an observation probability of three standard deviations and the measured t[bar t] cross section is:[sigma][sub p][bar p][yields] t[bar t]= 8.5[sub -3.6][sup+4.5] (stat)[sub -3.5][sup+6.3] (sys)[+-] 0.8 (lumi) pb.