Measurement of single top-quark production in the s-channel in proton–proton collisions at √s=13 TeV with the ATLAS detector

Anders, J.K.; Beck, H.P.; Chatterjee, M.; Ereditato, A.; Franconi, L.; Halser, L.; Haug, S.; Ilg, A.; Müller, R.; O'Neill, A.P.; Weber, M.S. (2023). Measurement of single top-quark production in the s-channel in proton–proton collisions at √s=13 TeV with the ATLAS detector. Journal of High Energy Physics, 06 Springer 10.1007/JHEP06(2023)191

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A measurement of single top-quark production in the s-channel is performed in proton–proton collisions at a centre-of-mass energy of 13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The dataset corresponds to an integrated luminosity of 139 fb−1. The analysis is performed on events with an electron or muon, missing transverse momentum and exactly two b-tagged jets in the final state. A discriminant based on matrix element calculations is used to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W -boson production in association with jets. The observed (expected) signal significance over the background-only hypothesis is 3.3 (3.9) standard deviations, and the measured cross-section is σ = 8.2+3.5−2.9 pb, consistent with the Standard Model prediction of σSM = 10.32+0.40−0.36 pb.

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