0601884 - FZÚ 2025 RIV DE eng J - Journal Article
Aad, G. - Aakvaag, E. - Abbott, B. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2900 authors
Observation of tt¯ production in the lepton+jets and dilepton channels in p+Pb collisions at √s_NN = 8.16 TeV with the ATLAS detector.
Journal of High Energy Physics. Roč. 2024, č. 11 (2024), č. článku 101. ISSN 1029-8479. E-ISSN 1029-8479
R&D Projects: GA MŠMT(CZ) EH22_008/0004632
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : ATLAS * TeV * dilepton * muon * electron
OECD category: Particles and field physics
Impact factor: 5, year: 2023 ; AIS: 0.998, rok: 2023
Method of publishing: Open access
DOI: https://doi.org/10.1007/JHEP11(2024)101

This paper reports the observation of top-quark pair production in proton-lead collisions in the ATLAS experiment at the Large Hadron Collider. The measurement is performed using 165 nb−1−1 of pp+Pb data collected at sNN=8.16sNN​ ​=8.16 TeV in 2016. Events are categorised in two analysis channels, consisting of either events with exactly one lepton (electron or muon) and at least four jets, or events with two opposite-charge leptons and at least two jets. In both channels at least one bb-tagged jet is also required. Top-quark pair production is observed with a significance over five standard deviations in each channel. The top-quark pair production cross-section is measured to be σttˉ=58.1±2.0  (stat.)  −4.4+4.8  (syst.)  nbσttˉ​=58.1±2.0(stat.)−4.4+4.8​(syst.)nb, with a total uncertainty of 9%. In addition, the nuclear modification factor is measured to be RpA=1.090±0.039  (stat.)  −0.087+0.094  (syst.)RpA​=1.090±0.039(stat.)−0.087+0.094​(syst.). The measurements are found to be in good agreement with theory predictions involving nuclear parton distribution functions.
Permanent Link: https://hdl.handle.net/11104/0359187