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Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector

Publication ,  Journal Article
Aaboud, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abidi, SH; AbouZeid, OS; Abraham, NL; Abramowicz, H; Abreu, H; Abreu, R; Abulaiti, Y ...
Published in: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
May 10, 2018

The production of a top quark in association with a Z boson is investigated. The proton–proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of s=13TeV are used, corresponding to an integrated luminosity of 36.1fb−1. Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a b-quark jet are selected. The major backgrounds are diboson, tt¯ and Z+jets production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2σ in the data and the expected significance is 5.4σ. The measured cross-section for tZq production is 600±170(stat.)±140(syst.)fb.

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Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

May 10, 2018

Volume

780

Start / End Page

557 / 577

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

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Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abidi, S. H., … Armitage, L. J. (2018). Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 780, 557–577. https://doi.org/10.1016/j.physletb.2018.03.023
Aaboud, M., G. Aad, B. Abbott, O. Abdinov, B. Abeloos, S. H. Abidi, O. S. AbouZeid, et al. “Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 780 (May 10, 2018): 557–77. https://doi.org/10.1016/j.physletb.2018.03.023.
Aaboud M, Aad G, Abbott B, Abdinov O, Abeloos B, Abidi SH, et al. Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018 May 10;780:557–77.
Aaboud, M., et al. “Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 780, May 2018, pp. 557–77. Scopus, doi:10.1016/j.physletb.2018.03.023.
Aaboud M, Aad G, Abbott B, Abdinov O, Abeloos B, Abidi SH, AbouZeid OS, Abraham NL, Abramowicz H, Abreu H, Abreu R, Abulaiti Y, Acharya BS, Adachi S, Adamczyk L, Adelman J, Adersberger M, Adye T, Affolder AA, Afik Y, Agatonovic-Jovin T, Agheorghiesei C, Aguilar-Saavedra JA, Ahlen SP, Ahmadov F, Aielli G, Akatsuka S, Akerstedt H, Åkesson TPA, Akilli E, Akimov AV, Alberghi GL, Albert J, Albicocco P, Alconada Verzini MJ, Alderweireldt SC, Aleksa M, Aleksandrov IN, Alexa C, Alexander G, Alexopoulos T, Alhroob M, Ali B, Aliev M, Alimonti G, Alison J, Alkire SP, Allbrooke BMM, Allen BW, Allport PP, Aloisio A, Alonso A, Alonso F, Alpigiani C, Alshehri AA, Alstaty MI, Alvarez Gonzalez B, Álvarez Piqueras D, Alviggi MG, Amadio BT, Amaral Coutinho Y, Amelung C, Amidei D, Amor Dos Santos SP, Amoroso S, Amundsen G, Anastopoulos C, Ancu LS, Andari N, Andeen T, Anders CF, Anders JK, Anderson KJ, Andreazza A, Andrei V, Angelidakis S, Angelozzi I, Angerami A, Anisenkov AV, Anjos N, Annovi A, Antel C, Antonelli M, Antonov A, Antrim DJ, Anulli F, Aoki M, Aperio Bella L, Arabidze G, Arai Y, Araque JP, Araujo Ferraz V, Arce ATH, Ardell RE, Arduh FA, Arguin JF, Argyropoulos S, Arik M, Armbruster AJ, Armitage LJ. Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018 May 10;780:557–577.
Journal cover image

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

May 10, 2018

Volume

780

Start / End Page

557 / 577

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics