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

G. Aad; T.P.A. Åkesson; K.S.V. Astrand; C. Doglioni; P.A. Ekman; V. Hedberg; H. Herde; B. Konya; E. Lytken; R. Poettgen; O. Smirnova; E.J. Wallin; L. Zwalinski; ATLAS Collaboration

doi:10.1103/PhysRevLett.134.142301

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

G. Aad, T.P.A. Åkesson, K.S.V. Astrand, C. Doglioni, P.A. Ekman, V. Hedberg, H. Herde, B. Konya, E. Lytken, R. Poettgen, O. Smirnova, E.J. Wallin, L. Zwalinski, ATLAS Collaboration

Research output: Contribution to journal › Article › peer-review

Abstract

Top-quark pair production is observed in lead-lead ((Formula presented)) collisions at (Formula presented) at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of (Formula presented). 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 (Formula presented), 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.

Original language	English
Article number	142301
Journal	Physical Review Letters
Volume	134
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.134.142301
Publication status	Published - 2025

Subject classification (UKÄ)

Subatomic Physics

Free keywords

Colliding beam accelerators
Electrons
Protons
ATLAS detectors
Data sample
Integrated luminosity
Large Hadron Collider
Large-hadron colliders
Pair production
Pb-Pb collisions
Production cross section
Standard deviation
Top quarks
article
cosmos
human
Ions

Access to Document

10.1103/PhysRevLett.134.142301Licence: CC BY

Cite this

Aad, G., Åkesson, T. P. A., Astrand, K. S. V., Doglioni, C., Ekman, P. A., Hedberg, V., Herde, H., Konya, B., Lytken, E., Poettgen, R., Smirnova, O., Wallin, E. J., Zwalinski, L., & ATLAS Collaboration (2025). Observation of 𝑡⁢¯𝑡 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

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title = "Observation of 𝑡⁢¯𝑡 Production in Pb+Pb Collisions at √𝑠NN=5.02 TeV with the ATLAS Detector",

abstract = "Top-quark pair production is observed in lead-lead ((Formula presented)) collisions at (Formula presented) at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of (Formula presented). 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 (Formula presented), 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. {\textcopyright} 2025 CERN, for the ATLAS Collaboration.",

keywords = "Colliding beam accelerators, Electrons, Protons, ATLAS detectors, Data sample, Integrated luminosity, Large Hadron Collider, Large-hadron colliders, Pair production, Pb-Pb collisions, Production cross section, Standard deviation, Top quarks, article, cosmos, human, Ions",

author = "G. Aad and T.P.A. {\AA}kesson and K.S.V. Astrand and C. Doglioni and P.A. Ekman and V. Hedberg and H. Herde and B. Konya and E. Lytken and R. Poettgen and O. Smirnova and E.J. Wallin and L. Zwalinski and \{ATLAS Collaboration\}",

year = "2025",

doi = "10.1103/PhysRevLett.134.142301",

language = "English",

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journal = "Physical Review Letters",

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Aad, G, Åkesson, TPA , Astrand, KSV, Doglioni, C, Ekman, PA, Hedberg, V , Herde, H , Konya, B , Lytken, E , Poettgen, R , Smirnova, O , Wallin, EJ, Zwalinski, L & ATLAS Collaboration 2025, 'Observation of 𝑡⁢¯𝑡 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

TY - JOUR

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

AU - Aad, G.

AU - Åkesson, T.P.A.

AU - Astrand, K.S.V.

AU - Doglioni, C.

AU - Ekman, P.A.

AU - Hedberg, V.

AU - Herde, H.

AU - Konya, B.

AU - Lytken, E.

AU - Poettgen, R.

AU - Smirnova, O.

AU - Wallin, E.J.

AU - Zwalinski, L.

AU - ATLAS Collaboration

PY - 2025

Y1 - 2025

N2 - Top-quark pair production is observed in lead-lead ((Formula presented)) collisions at (Formula presented) at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of (Formula presented). 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 (Formula presented), 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.

AB - Top-quark pair production is observed in lead-lead ((Formula presented)) collisions at (Formula presented) at the Large Hadron Collider with the ATLAS detector. The data sample was recorded in 2015 and 2018, amounting to an integrated luminosity of (Formula presented). 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 (Formula presented), 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.

KW - Colliding beam accelerators

KW - Electrons

KW - Protons

KW - ATLAS detectors

KW - Data sample

KW - Integrated luminosity

KW - Large Hadron Collider

KW - Large-hadron colliders

KW - Pair production

KW - Pb-Pb collisions

KW - Production cross section

KW - Standard deviation

KW - Top quarks

KW - article

KW - cosmos

KW - human

KW - Ions

U2 - 10.1103/PhysRevLett.134.142301

DO - 10.1103/PhysRevLett.134.142301

M3 - Article

C2 - 40279599

SN - 0031-9007

VL - 134

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 142301

ER -