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Measurement of the top-quark pole mass in dileptonic tt[bar]+ 1-jet events at √s=13 TeV with the ATLAS experiment

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A measurement of the top-quark pole mass m t pole is presented in tt̄ events with an additional jet, tt̄+ 1-jet, produced in pp collisions at √s=13 TeV. The data sample, recorded with the ATLAS experiment during Run 2 of the LHC, corresponds to an integrated luminosity of 140 fb−1. Events with one e...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Backes, Mathias (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Nandi, Abhirikshma (Author) , Rassloff, Damir Fabrice (Author) , Sanfilippo, Lorenzo (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: December 3, 2026
In: Journal of high energy physics
Year: 2025, Issue: 12, Pages: 1-50
ISSN:1029-8479
DOI:10.1007/JHEP12(2025)023
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP12(2025)023
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP12(2025)023
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Author Notes:The ATLAS collaboration
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Summary:A measurement of the top-quark pole mass m t pole is presented in tt̄ events with an additional jet, tt̄+ 1-jet, produced in pp collisions at √s=13 TeV. The data sample, recorded with the ATLAS experiment during Run 2 of the LHC, corresponds to an integrated luminosity of 140 fb−1. Events with one electron and one muon of opposite electric charge in the final state are selected to measure the tt̄+ 1-jet differential cross-section as a function of the inverse of the invariant mass of the tt̄+ 1-jet system. Iterative Bayesian Unfolding is used to correct the data to enable comparison with fixed-order calculations at next-to-leading-order accuracy in the strong coupling. The process pp →tt̄j (2→3), where top quarks are taken as stable particles, and the process pp → bb̄l+pp → bb̄l+vl̄ ν̄j (2 → 7), which includes top-quark decays to the dilepton final state and off-shell effects, are considered. The top-quark mass is extracted using a χ2 fit of the unfolded normalized differential cross-section distribution. The results obtained with the 2 → 3 and 2 → 7 calculations are compatible within theoretical uncertainties, providing an important consistency check. The more precise determination is obtained for the 2 → 3 measurement: m t pole = 70.7±0.3 (stat.)±1.4 (syst.)±0.3 (scale)±0.2 (PDF⊕αS) GeV, which is in good agreement with other top-quark mass results.
Item Description:Im Titel steht der zweite Buchstabe t mit einem Oberstrich
ATLAS Collaboration: G. Aad, A. Ackermann, M.J. Backes, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, A. Nandi, D.F. Rassloff, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser und weitere 2914
Gesehen am 27.04.2026
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP12(2025)023

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