Measurement of single top-quark production in association with a W boson in the single-lepton channel at √s=8TeV with the ATLAS detector

0551054 - FZÚ 2022 RIV DE eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2935 authors
Measurement of single top-quark production in association with a W boson in the single-lepton channel at √s=8TeV with the ATLAS detector.
European Physical Journal C. Roč. 81, č. 8 (2021), č. článku 720. ISSN 1434-6044. E-ISSN 1434-6052
R&D Projects: GA MŠMT(CZ) LTT17018
Research Infrastructure: CERN-CZ II - 90104
Institutional support: RVO:68378271
Keywords : ATLAS * neural network * TeV * muon * CERN Lab
OECD category: Particles and field physics
Impact factor: 4.994, year: 2021
Method of publishing: Open access

The production cross-section of a top quark in association with a W boson is measured using proton–proton collisions at s=8 TeVsqrt{s} = 8, ext {TeV}s ​=8TeV. The dataset corresponds to an integrated luminosity of 20.2 fb−120.2, ext {fb}^{-1}20.2fb−1, and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the tW signal from the dominant ttˉt{ ar{t}}ttˉ background. The cross-section is extracted from a binned profile maximum-likelihood fit to a two-dimensional discriminant built from the neural-network output and the invariant mass of the hadronically decaying W boson. The measured cross-section is σtW=26±7 pbsigma _{tW} = 26 pm 7, ext {pb}σtW​=26±7pb, in good agreement with the Standard Model expectation.
Permanent Link: http://hdl.handle.net/11104/0326371