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Observation of š‘”ā¢š‘” production in Pb+Pb collisions at āˆšš‘ NN = 5.02ā€‰ā€‰TeV with the ATLAS Detector

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Top-quark pair production is observed in lead-lead (Pb+Pb) collisions at āˆšš‘ NN=5.02 TeV at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of 1.9 nbāˆ’1. Events with exactly one electron and one muon and at least tw...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Sanfilippo, Lorenzo (Author) , SchoĢˆning, AndreĢ (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Vigani, Luigi (Author) , Wessels, Martin (Author) , ZinƟer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 7 April 2025
In: Physical review letters
Year: 2025, Volume: 134, Issue: 14, Pages: 1-22
ISSN:1079-7114
DOI:10.1103/PhysRevLett.134.142301
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.134.142301
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.134.142301
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Author Notes:G. Aad et al. (ATLAS Collaboration)
Description
Summary:Top-quark pair production is observed in lead-lead (Pb+Pb) collisions at āˆšš‘ NN=5.02 TeV at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of 1.9 nbāˆ’1. Events with exactly one electron and one muon and at least two jets are selected. Top-quark pair production is measured with an observed (expected) significance of 5.0 (4.1) standard deviations. The measured top-quark pair production cross section is šœŽš‘”ā¢ĀÆš‘”=3.6ā¢ +1.0āˆ’0.9ā¢(stat)ā¢ +0.8āˆ’0.5ā¢(syst) Ī¼ā¢b, with a total relative uncertainty of 31%, and is consistent with theoretical predictions using a range of different nuclear parton distribution functions. The observation of this process consolidates the evidence of the existence of all quark flavors in the preequilibrium stage of the quark-gluon plasma at very high energy densities, similar to the conditions present in the early Universe.
Item Description:Im Titel steht sNN unter dem Wurzelsymbol, NN ist dabei tiefgestellt
Atlas Collaboration: G. Aad, A. Ackermann, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, T. Junkermann, T. Mkrtchyan, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, L. Vigani, M. Wessels, J. ZinƟer [und zahlreiche weitere]
Gesehen am 09.04.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.134.142301

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