Differential tt̄ cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb−1 of ATLAS data
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 w...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
April 18, 2023
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| In: |
Journal of high energy physics
Year: 2023, Heft: 4, Pages: 1-108 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP04(2023)080 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP04(2023)080
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| Verfasserangaben: | The ATLAS collaboration |
MARC
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| 245 | 1 | 0 | |a Differential tt̄ cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb−1 of ATLAS data |c The ATLAS collaboration |
| 246 | 3 | 3 | |a Differential t t overline cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb −1 of ATLAS data |
| 264 | 1 | |c April 18, 2023 | |
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| 500 | |a The ATLAS collaboration: G. Aad, L.M. Baltes, F. Bartels, F.L. Castillo, S. Dittmeier, M. Dunford, S. Franchino, M. Klassen, T. Mkrtchyan, P. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H.C. Schultz-Coulon, R. Stamen, P. Starovoitov, L. Vigani, S. Weber, M. Wessels, J. Zinsser [und viele weitere] | ||
| 500 | |a Gesehen am 06.11.2023 | ||
| 520 | |a 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 $$ t\overline{t}\to WWb\overline{b} $$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. | ||
| 650 | 4 | |a Hadron-Hadron Scattering | |
| 650 | 4 | |a Jet Substructure and Boosted Jets | |
| 650 | 4 | |a Top Physics | |
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