| Issue |
EPJ Web Conf.
Volume 364, 2026
XXXI International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions “Quark Matter 2025”
|
|
|---|---|---|
| Article Number | 09002 | |
| Number of page(s) | 4 | |
| Section | Initial State of Hadronic and Electron-Ion Collisions & Nuclear Structure | |
| DOI | https://doi.org/10.1051/epjconf/202636409002 | |
| Published online | 17 April 2026 | |
https://doi.org/10.1051/epjconf/202636409002
Top-quark pair production in p+Pb collisions in the ATLAS experiment
AGH University of Krakow, Al. Mickiewicza 30, 30-059 Krakow
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Published online: 17 April 2026
Abstract
Measurements of top-quark pairs in heavy-ion collisions are expected to provide novel probes of nuclear parton distribution functions at high Bjorken-x values, which are difficult to access experimentally using other available probes. In this report, the observation of top-quark pair production in proton-lead collisions at the centre-of-mass energy of 8.16 TeV in the ATLAS experiment at the LHC is discussed. Top-quark pair production is measured in the lepton+jets and the di-lepton channels, with a significance well above 5 standard deviations in each channel separately. The nuclear modification factor RpA is also measured for the first time for the top-quark pair process.
© The Authors, published by EDP Sciences, 2026
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