Observation of Electroweak Single Top-Quark Production

Aaltonen,; And Adelman, T.; And Akimoto, J.; And Alvarez Gonzalez, T.; And Amerio, B.; And Amidei, S.; And Anastassov, D.; And Annovi, A.; And Antos, A.; And Apollinari, J.; And Apresyan, G.; And Arisawa, A.; And Artikov, T.; And Ashmanskas, A.; And Attal, W.; And Aurisano, A.; And Azfar, A.; And Badgett, F.; and Barbaro-Galtieri, W.; And Barnes, A.; And Barnett, V. E.; And Barria, B. A.; And Bartsch, P.; And Bauer, V.; And Beauchemin, G.; And Bedeschi, P. -H.; And Beecher, F.; And Behari, D.; And Bellettini, S.; And Bellinger, G.; And Benjamin, J.; And Beretvas, D.; And Beringer, A.; And Bhatti, J.; And Binkley, A.; And Bisello, M.; And Bizjak, D.; And Blair, I.; And Blocker, R. E.; And Blumenfeld, C.; And Bocci, B.; And Bodek, A.; And Boisvert, A.; And Bolla, V.; And Bortoletto, G.; And Boudreau, D.; And Boveia, J.; And Brau, A.; And Bridgeman, B.; And Brigliadori, A.; And Bromberg, L.; And Brubaker, C.; And Budagov, E.; And Budd, J.; And Budd, H. 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doi:10.1103/PhysRevLett.103.092002

We report the observation of single top-quark production using 3.2 fb(-1) of pp collision data with s=1.96 TeV 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 m(t)=175 GeV/c(2), we measure a cross section of 2.3(-0.5)(+0.6)(stat+syst) pb, extract the CKM matrix-element value |V-tb|=0.91 +/- 0.11(stat+syst)+/- 0.07(theory), and set the limit |V-tb|> 0.71 at the 95\% C.L.