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Observation of tt¯ Production in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector

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Observation of tt¯ Production in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector. / The ATLAS collaboration.
In: Physical review letters, Vol. 134, No. 14, 142301, 11.04.2025.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

The ATLAS collaboration 2025, 'Observation of tt¯ Production in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector', Physical review letters, vol. 134, no. 14, 142301. https://doi.org/10.1103/physrevlett.134.142301

APA

The ATLAS collaboration (2025). Observation of tt¯ Production in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector. Physical review letters, 134(14), Article 142301. https://doi.org/10.1103/physrevlett.134.142301

Vancouver

The ATLAS collaboration. Observation of tt¯ Production in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector. Physical review letters. 2025 Apr 11;134(14):142301. Epub 2025 Apr 7. doi: 10.1103/physrevlett.134.142301

Author

The ATLAS collaboration. / Observation of tt¯ Production in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector. In: Physical review letters. 2025 ; Vol. 134, No. 14.

Bibtex

@article{5be9f5d12df24bc8a2997a081c191d9f,
title = "Observation of tt{\^A}¯ Production in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector",
abstract = "Top-quark pair production is observed in lead{\^a}€“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{\^a}ˆ{\textquoteright}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 {\"I}ƒtt{\^A}¯=3.6 {\^a}ˆ{\textquoteright}0.9+1.0(stat) {\^a}ˆ{\textquoteright}0.5+0.8(syst) {\^I}¼b, 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. {\^A}{\textcopyright} 2025 CERN, for the ATLAS Collaboration 2025 CERN",
author = "{The ATLAS collaboration} and Hanadi Ali and Zainab Alsolami and A.E. Barton and G. Borissov and E.V. Bouhova-Thacker and Ruby Ferguson and James Ferrando and H. Fox and Alina Hagan and R.C.W. Henderson and R.W.L. Jones and V. Kartvelishvili and P.A. Love and Marshall, {Emma J.} and Luke McElhinney and L. Meng and D. Muenstermann and Elliot Sampson and M. Smizanska and A.M. Wharton",
year = "2025",
month = apr,
day = "11",
doi = "10.1103/physrevlett.134.142301",
language = "English",
volume = "134",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "14",

}

RIS

TY - JOUR

T1 - Observation of tt¯ Production in Pb+Pb Collisions at sNN=5.02 TeV with the ATLAS Detector

AU - The ATLAS collaboration

AU - Ali, Hanadi

AU - Alsolami, Zainab

AU - Barton, A.E.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Ferguson, Ruby

AU - Ferrando, James

AU - Fox, H.

AU - Hagan, Alina

AU - Henderson, R.C.W.

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Love, P.A.

AU - Marshall, Emma J.

AU - McElhinney, Luke

AU - Meng, L.

AU - Muenstermann, D.

AU - Sampson, Elliot

AU - Smizanska, M.

AU - Wharton, A.M.

PY - 2025/4/11

Y1 - 2025/4/11

N2 - 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 σtt¯=3.6 −0.9+1.0(stat) −0.5+0.8(syst) μb, 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. © 2025 CERN, for the ATLAS Collaboration 2025 CERN

AB - 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 σtt¯=3.6 −0.9+1.0(stat) −0.5+0.8(syst) μb, 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. © 2025 CERN, for the ATLAS Collaboration 2025 CERN

U2 - 10.1103/physrevlett.134.142301

DO - 10.1103/physrevlett.134.142301

M3 - Journal article

VL - 134

JO - Physical review letters

JF - Physical review letters

SN - 0031-9007

IS - 14

M1 - 142301

ER -