Tevatron Combination of Single-Top-Quark Cross Sections and Determination of the Magnitude of the Cabibbo-Kobayashi-Maskawa Matrix Element ${\mathbf{V}}_{\mathbf{tb}}$

Abstract

We present the final combination of CDF and D0 measurements of cross sections for single-top-quark production in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. The data correspond to total integrated luminosities of up to 9.7 fb${}^{-1}$ per experiment. The $t$-channel cross section is measured to be ${\sigma }_t=2.25_{-0.31}^{+0.29}$ pb. We also present the combinations of the two-dimensional measurements of the $s$- vs. $t$-channel cross sections and of the $s+t$ channel cross section measurement resulting in ${\sigma }_{s+t}=3.30_{-0.40}^{+0.52}$ pb, without assuming the standard-model value for the ratio ${\sigma }_s/{\sigma }_t$. The resulting value of the magnitude of the top-to-bottom quark coupling is $|V_{tb}|$ = $1.02_{-0.05}^{+0.06}$, corresponding to $|V_{tb}|>0.92$ at the 95% C.L.

11 pages, 4 figures

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