Comprehensive measurements of t-channel single top-quark production cross sections at [radical]s = 7 TeV with the ATLAS detector

This article presents measurements of the t-channel single top-quark (t) and top-antiquark (t) total production cross sections [sigma](tq) and [sigma](tq), their ratio R sub(t) = [sigma](tq)/[sigma](tq), and a measurement of the inclusive production cross section [sigma](tq + tq) in proton-proton collisions at [radical]s = 7 TeV at the LHC. Differential cross sections for the tq and tq processes are measured as a function of the transverse momentum and the absolute value of the rapidity of t and t, respectively. The analyzed data set was recorded with the ATLAS detector and corresponds to an integrated luminosity of 4.59 fb super(-1). Selected events contain one charged lepton, large missing transverse momentum, and two or three jets. The cross sections are measured by performing a binned maximum-likelihood fit to the output distributions of neural networks. The resulting measurements are [sigma](tq) = 46 + or - 1(stat) + or - 6(syst) pb [sigma](tq) = 23 + or - 1(stat) + or - 3(syst) pb R sub(t) = 2.04 + or - 0.13 (stat) + or - 0.12(syst), and [sigma](tq + tq) = 68 + or - 2 (stat) + or - 8(syst) pb consistent with the Standard Model expectation. The uncertainty on the measured cross sections is dominated by systematic uncertainties, while the uncertainty on R sub(t) is mainly statistical. Using the ratio of [sigma](tq + tq) to its theoretical prediction, and assuming that the top-quark-related CKM matrix elements obey the relation V sub(tb) >> V sub(ts), V sub(td), we determine V sub(tb) = 1.02 + or - 0.07.