Measurements of differential cross-sections in top-quark pair events with a high transverse momentum top quark and limits on beyond the Standard Model contributions to top-quark pair production with the ATLAS detector at √s = 13 TeV
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Fecha
2022-06
Profesor/a Guía
Facultad/escuela
Idioma
en
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Editor
Springer Science and Business Media Deutschland GmbH
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Licencia CC
CC BY 4.0 DEED
Atribución 4.0 Internacional
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https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
Cross-section measurements of top-quark pair production where the hadronically decaying top quark has transverse momentum greater than 355 GeV and the other top quark decays into ℓνb are presented using 139 fb−1 of data collected by the ATLAS experiment during proton-proton collisions at the LHC. The fiducial cross-section at s = 13 TeV is measured to be σ = 1.267 ± 0.005 ± 0.053 pb, where the uncertainties reflect the limited number of data events and the systematic uncertainties, giving a total uncertainty of 4.2%. The cross-section is measured differentially as a function of variables characterising the tt¯ system and additional radiation in the events. The results are compared with various Monte Carlo generators, including comparisons where the generators are reweighted to match a parton-level calculation at next-to-next-to-leading order. The reweighting improves the agreement between data and theory. The measured distribution of the top-quark transverse momentum is used to search for new physics in the context of the effective field theory framework. No significant deviation from the Standard Model is observed and limits are set on the Wilson coefficients of the dimension-six operators OtG and Otq(8), where the limits on the latter are the most stringent to date. [Figure not available: see fulltext.]. © 2022, The Author(s).
Notas
Indexación: Scopus.
Palabras clave
Beyond Standard Model, Hadron-Hadron Scattering, Top Physics
Citación
Journal of High Energy Physics, Volume 2022, Issue 6, June 2022, Article number 63
DOI
10.1007/JHEP06(2022)063