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https://hdl.handle.net/10316/106297
Título: | Observation of the associated production of a top quark and a Z boson in pp collisions at √s = 13 TeV with the ATLAS detector | Autor: | Fiolhais, M. C. N. Veloso, F. Wolters, H. ATLAS Collaboration |
Data: | 2020 | Editora: | Springer Nature | Título da revista, periódico, livro ou evento: | Journal of High Energy Physics | Volume: | 2020 | Número: | 7 | Resumo: | 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. | URI: | https://hdl.handle.net/10316/106297 | DOI: | 10.1007/JHEP07(2020)124 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Física - Artigos em Revistas Internacionais |
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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-detectorJournal-of-High-Energy-Physics.pdf | 834.29 kB | Adobe PDF | Ver/Abrir |
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