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Observation of 𝑡⁢𝑡 production in Pb+Pb collisions at √𝑠NN = 5.02  TeV with the ATLAS Detector

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Top-quark pair production is observed in lead-lead (Pb+Pb) collisions at √𝑠NN=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 nb−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) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Vigani, Luigi (Author) , Wessels, Martin (Author) , Zinßer, 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 √𝑠NN=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 nb−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 𝜎𝑡⁢¯𝑡=3.6⁢ +1.0−0.9⁢(stat)⁢ +0.8−0.5⁢(syst) μ⁢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. Zinßer [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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