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https://hdl.handle.net/10316/107969
Title: | 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 | Authors: | Santos, S. P. Amor dos Fiolhais, M. C. N. Galhardo, B. Veloso, F. Wolters, H. ATLAS Collaboration |
Issue Date: | 2018 | Publisher: | Elsevier | Serial title, monograph or event: | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Volume: | 780 | Abstract: | The production of a top quark in association with a Zboson 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=13 TeVare used, corresponding to an integrated luminosity of 36.1 fb−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, t¯tand Z+jetsproduction. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2σin the data and the expected significance is 5.4σ. The measured cross-section for tZqproduction is 600 ±170 (stat.)±140 (syst.)fb. | URI: | https://hdl.handle.net/10316/107969 | DOI: | 10.1016/j.physletb.2018.03.023 | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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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.pdf | 1.52 MB | Adobe PDF | View/Open |
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