Observation of s-channel production of single top quarks at the Tevatron

Abstract

We report the first observation of single-top-quark production in the s channel through the combination of the CDF and D0 measurements of the cross section 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 measured cross section is ${\sigma }_s=1.29_{-0.24}^{+0.26}$ pb. The probability of observing a statistical fluctuation of the background to a cross section of the observed size or larger is $1.8\times 10^{-10}$, corresponding to a significance of 6.3 standard deviations for the presence of an s-channel contribution to the production of single-top quarks.

11 pages, 5 figures, submitted to Phys. Rev. Lett

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