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We report the observation of single top-quark production using 3.2fb-1 of pp̄ collision data with s=1.96TeV collected by the Collider Detector at Fermilab. The significance of the observed data is 5.0 standard deviations, and the expected sensitivity for standard model production and decay is in excess of 5.9 standard deviations. Assuming mt=175GeV/c2, we measure a cross section of 2.3-0.5+0.6(stat+syst)pb, extract the CKM matrix-element value |Vtb|=0.91±0.11(stat+syst)±0.07(theory), and set the limit |Vtb|>0.71 at the 95% C.L. © 2009 The American Physical Society.

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Physical Review Letters