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We present measurements of production cross sections of single top quarks in$\ppbar$ collisions at $\sqrt{s}=1.96\;\rm TeV$ in a data sample correspondingto an integrated luminosity of $5.4\;\rm fb^{-1}$ collected by the D0 detectorat the Fermilab Tevatron Collider. We select events with an isolated electronor muon, an imbalance in transverse energy, and two, three, or four jets, withone or two of them containing a bottom hadron. We obtain an inclusive crosssection of $\sigma({\ppbar}{\rargap}tb+X, tqb+X) = 3.43\pm^{0.73}_{0.74}\;\rmpb$ and use it to extract the CKM matrix element $0.79 < |V_{tb}| \leq 1$ atthe 95% C.L. We also measure $\sigma({\ppbar}{\rargap}tb+X) =0.68\pm^{0.38}_{0.35}\;\rm pb$ and $\sigma({\ppbar}{\rargap}tqb+X) =2.86\pm^{0.69}_{0.63}\;\rm pb$ when assuming, respectively, $tqb$ and $tb$production rates as predicted by the standard model.

Measurements of single top quark production cross sections and |Vtb| in ppbar collisions at sqrt{s}=1.96 TeV