Measurement of t-channel single-top-quark production in pp collisions at sqrt(s) = 5.02 TeV with the ATLAS detector

The observation of the electroweak production of single-top-quarks is made using 255 pb^{-1} of proton-proton collision data recorded at $\sqrt{s} = 5.02$ TeV with the ATLAS detector at the Large Hadron Collider. An event selection is used to identify single-top-quark candidates arising from $t$-channel production with the top quark decaying semi-leptonically. Events passing the selection are then used to measure the inclusive cross-section for the combined production of single-top-quarks and antiquarks, $\sigma({tq + \bar{t}q})$, and the ratio $R_t$ between these two. They are measured to be $\sigma({tq + \bar{t}q}) = 27.1^{+4.4}_{-4.1} (stat.) ^{+4.4}_{-3.7} (syst.)$ pb and $R_t = 2.73^{+1.43}_{-0.82} (stat.) ^{+1.01}_{-0.29} (syst.)$. The individual single-top-quark ($t q$) and single-top-antiquark ($\bar{t} q$) production cross-sections are measured to be $\sigma(t q) = 19.8^{+3.9}_{-3.1} (\text{stat.}) ^{+2.9}_{-2.2} (\text{syst.})$ pb and $\sigma(\bar{t}q) = 7.3^{+3.2}_{-2.1} (stat.) ^{+2.8}_{-1.5} (syst.)$ pb. All measurements are in good agreement with the Standard Model predictions.