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 Publications, M. Faucci Giannelli, A. Hasib, M.P. Heath, X. Hoad, S. Palazzo, A. Søgaard, A. Strubig, E.P. Takeva, A.J. Taylor, A. Washbrook

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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
t¯tZ and diboson production. Neural networks are used to improve the background rejection and extract the signal. The measured cross-section for t`+`−q production, including nonresonant dilepton pairs with m`+`− > 30 GeV, is 97 ± 13 (stat.) ± 7 (syst.) fb, consistent with the Standard Model prediction.
Original languageEnglish
Article number124
Pages (from-to)1-45
Number of pages45
Journal Journal of High Energy Physics
Volume2020
Issue number7
DOIs
Publication statusPublished - 20 Jul 2020

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