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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

Aad G.
•
Abbott B.
•
Abbott D. C.
altro
Zwalinski L.
2020
  • journal article

Periodico
JOURNAL OF HIGH ENERGY PHYSICS
Abstract
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. 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 tt ̄ 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 ml+l−> 30 GeV, is 97 ± 13 (stat.) ± 7 (syst.) fb, consistent with the Standard Model prediction. [Figure not available: see fulltext.]
DOI
10.1007/JHEP07(2020)124
WOS
WOS:000565307900001
Archivio
http://hdl.handle.net/11390/1188910
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85088394905
Diritti
open access
Soggetti
  • Hadron-Hadron scatter...

Scopus© citazioni
14
Data di acquisizione
Jun 7, 2022
Vedi dettagli
Web of Science© citazioni
19
Data di acquisizione
Mar 20, 2024
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