Observation of the associated production of a top quark and a <em>Z</em> boson in <em>pp</em> collisions at $ \sqrt{s} $= 13 TeV with the ATLAS detector [electronic resource]
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| Format: | Electronic eBook |
| Language: | English |
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Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2020.
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| Abstract: | Single top-quark production in association with a <em>Z</em> boson, where the <em>Z</em> 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<sup>-1</sup>. Events containing three isolated charged leptons (electrons or muons) and two or three jets, one of which is identified as containing a <em>b</em>-hadron, are selected. The main backgrounds are from <span class="mathjax-tex">\( t\overline{t}Z \)</span> and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for <em>t</em>?<sup>+</sup>?<sup>-</sup><em>q</em> production, including non-resonant dilepton pairs with <span class="mathjax-tex">\( {m}_{{\mathrm{\ell}}̂{+}{\mathrm{\ell}}̂{-}} \)</span><i>></i> 30 GeV, is 97 ł 13 (stat.) ł 7 (syst.) fb, consistent with the Standard Model prediction. |
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| Item Description: | Published through Scitech Connect. 07/20/2020. "Journal ID: ISSN 1029-8479." "Other: ark:/13030/qt7r47j9fz." Aad, G; Abbott, B; Abbott, DC; Abed Abud, A; Abeling, K; Abhayasinghe, DK; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, H; Abreu, H; Abulaiti, Y; Acharya, BS; Achkar, B; Adachi, S; Adam, L; Adam Bourdarios, C; Adamczyk, L; Adamek, L; Adelman, J; Adersberger, M; Adiguzel, A; Adorni, S; Adye, T; Affolder, AA; Afik, Y; Agapopoulou, C; Agaras, MN; Aggarwal, A; Agheorghiesei, C; Aguilar-Saavedra, JA; Ahmadov, F; Ahmed, WS; Ai, X; Aielli, G; Akatsuka, S; ¿kesson, TPA; Akilli, E; Akimov, AV; Al Khoury, K; Alberghi, GL; Albert, J; Alconada Verzini, MJ; Alderweireldt, S; Aleksa, M; Aleksandrov, IN; Alexa, C; Alexopoulos, T; Alfonsi, A; Alfonsi, F; Alhroob, M; Ali, B; Aliev, M; Alimonti, G; Allaire, C; Allbrooke, BMM; Allen, BW; Allport, PP; Aloisio, A; Alonso, F; Alpigiani, C; Alshehri, AA; Alunno Camelia, E; Alvarez Estevez, M; Alviggi, MG; Amaral Coutinho, Y; Ambler, A; Ambroz, L; Amelung, C; Amidei, D; Amor Dos Santos, SP; Amoroso, S; Amrouche, CS; An, F; Anastopoulos, C; Andari, N; Andeen, T; Anders, CF; Anders, JK; Andreazza, A; Andrei, V; Anelli, CR; Angelidakis, S; Angerami, A; Anisenkov, AV; Annovi, A; Antel, C; Anthony, MT; Antipov, E; Antonelli, M; Antrim, DJA; Anulli, F; Aoki, M; Aparisi Pozo, JA; Aperio Bella, L; Araque, JP; Araujo Ferraz, V; Araujo Pereira, R; Arcangeletti, C; Arce, ATH. |
| Physical Description: | Size: Article No. 124 : digital, PDF file. |