Observation of the associated production of a top quark and a Z boson in pp collisions at √s = 13 TeV with the ATLAS detector

ATLAS Collaboration

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Abstract

Single top-quark production in association with a Z boson 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. 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 tt̅Z 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 ml+l- > 30$ GeV, is 97 ± 13 (stat.) ± 7 (syst.) fb, consistent with the Standard Model prediction.
Original languageEnglish
Article number124
Number of pages46
JournalJHEP
Volume2020
Issue number7
DOIs
Publication statusPublished - 20 Jul 2020

Bibliographical note

Comments: 44 pages in total, author list starting page 28, 6 figures, 4 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2018-01/

Keywords

  • Hadron-Hadron scattering (experiments)
  • hep-ex

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