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Observation of the associated production of a top quark and a Z boson in pp collisions at √s = 13 TeV with the ATLAS detector
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SYSNO ASEP 0537658 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Observation of the associated production of a top quark and a Z boson in pp collisions at √s = 13 TeV with the ATLAS detector Author(s) Aad, G. (FR)
Abbott, B. (US)
Abbott, D.C. (US)
Chudoba, Jiří (FZU-D) RID, ORCID
Hejbal, Jiří (FZU-D) RID, ORCID
Hladík, Ondřej (FZU-D) ORCID
Jačka, Petr (FZU-D) ORCID
Jakoubek, Tomáš (FZU-D) RID, ORCID
Kepka, Oldřich (FZU-D) RID, ORCID
Kroll, Jiří (FZU-D) ORCID
Kupčo, Alexander (FZU-D) RID, ORCID
Lokajíček, Miloš (FZU-D) RID, ORCID
Lysák, Roman (FZU-D) RID, ORCID
Marčišovský, Michal (FZU-D) RID, ORCID
Mikeštíková, Marcela (FZU-D) RID, ORCID
Němeček, Stanislav (FZU-D) RID, ORCID
Penc, Ondřej (FZU-D) ORCID
Šícho, Petr (FZU-D) RID, ORCID
Staroba, Pavel (FZU-D) RID, ORCID
Svatoš, Michal (FZU-D) RID, ORCID
Taševský, Marek (FZU-D) RID, ORCIDNumber of authors 2897 Article number 124 Source Title Journal of High Energy Physics. - : Springer - ISSN 1029-8479
Roč. 2020, č. 7 (2020), s. 1-46Number of pages 46 s. Language eng - English Country US - United States Keywords ATLAS ; CERN ; LHC ; Higgs particle ; Hadron-Hadron scatering ; leptonic Subject RIV BF - Elementary Particles and High Energy Physics OECD category Particles and field physics R&D Projects LTT17018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CERN-CZ II - 90104 - Fyzikální ústav AV ČR, v. v. i. Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000565307900001 EID SCOPUS 85088394905 DOI 10.1007/JHEP07(2020)124 Annotation Single top-quark production in association with a Z boson, where the Z boson decays to a pair of charged leptons, is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment from 2015 to 2018 at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 139 fb^{−1} −1 . Events containing three isolated charged leptons (electrons or muons) and two or three jets, one of which is identified as containing a b-hadron, are selected. The main backgrounds are from toverline{t}Zt t Z and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for tℓ^{+} + ℓ^{−} − q production, including non-resonant dilepton pairs with {m}_{{mathrm{ell}}^{+}{mathrm{ell}}^{-}}m ℓ +ℓ −> 30 GeV, is 97 ± 13 (stat.) ± 7 (syst.) fb, consistent with the Standard Model prediction.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2021 Electronic address http://hdl.handle.net/11104/0315517
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