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W.Yu, C.Yu, J.Yurkewicz, A.Zatserklyaniy, A.Zeitnitz, C.Zhang, D.Zhao, T.Zhou, B.Zhu, J.Zielinski, M.Zieminska, D.Zieminski, A.Zutshi, V.Zverev, E. G.2014-05-202014-05-202007-05-04Physical Review Letters. College Pk: American Physical Soc, v. 98, n. 18, 8 p., 2007.0031-9007http://hdl.handle.net/11449/23573The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron < p(p)over bar > collider. Using a 0.9 fb(-1) dataset, we apply a multivariate analysis to separate signal from background and measure sigma(< p(p)over bar >-> tb+X,tqb+X)=4.9 +/- 1.4 pb. The probability to measure a cross section at this value or higher in the absence of a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68 <vertical bar V-tb vertical bar <= 1 at 95% C.L. within the standard model.8engArtigo10.1103/PhysRevLett.98.181802WOS:000246210200017Acesso restritoWOS000246210200017.pdf