Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/87758
Título: | Differential tt¯ cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb −1 of ATLAS data |
Autor(es): | Castro, Nuno Filipe Onofre, A. ATLAS Collaboration |
Palavras-chave: | Hadron-Hadron Scattering Jet Substructure and Boosted Jets Top Physics |
Data: | 2023 |
Editora: | Springer |
Revista: | Journal of High Energy Physics |
Citação: | Aad, G., Abbott, B., Abbott, D. C., Abed Abud, A., Abeling, K., Abhayasinghe, D. K., . . . Zwalinski, L. (2023). Differential tt¯ cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb −1 of ATLAS data. [Article]. JOURNAL OF HIGH ENERGY PHYSICS, 2023(4). doi: 10.1007/jhep04(2023)080 |
Resumo(s): | Measurements of single-, double-, and triple-differential cross-sections are presented for boosted top-quark pair-production in 13 TeV proton–proton collisions recorded by the ATLAS detector at the LHC. The top quarks are observed through their hadronic decay and reconstructed as large-radius jets with the leading jet having transverse momentum (pT) greater than 500 GeV. The observed data are unfolded to remove detector effects. The particle-level cross-section, multiplied by the tt¯ → WWbb¯ branching fraction and measured in a fiducial phase space defined by requiring the leading and second-leading jets to have pT> 500 GeV and pT> 350 GeV, respectively, is 331 ± 3(stat.) ± 39(syst.) fb. This is approximately 20% lower than the prediction of 398−49+48 fb by Powheg+Pythia 8 with next-to-leading-order (NLO) accuracy but consistent within the theoretical uncertainties. Results are also presented at the parton level, where the effects of top-quark decay, parton showering, and hadronization are removed such that they can be compared with fixed-order next-to-next-to-leading-order (NNLO) calculations. The parton-level cross-section, measured in a fiducial phase space similar to that at particle level, is 1.94 ± 0.02(stat.) ± 0.25(syst.) pb. This agrees with the NNLO prediction of 1.96−0.17+0.02 pb. Reasonable agreement with the differential cross-sections is found for most NLO models, while the NNLO calculations are generally in better agreement with the data. The differential cross-sections are interpreted using a Standard Model effective field-theory formalism and limits are set on Wilson coefficients of several four-fermion operators. [Figure not available: see fulltext.]. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/87758 |
DOI: | 10.1007/jhep04(2023)080 |
ISSN: | 1126-6708 |
e-ISSN: | 1029-8479 |
Versão da editora: | https://link.springer.com/article/10.1007/JHEP04(2023)080 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | LIP - Artigos/papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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JHEP04(2023)080.pdf | 5,46 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons