Observation of tt¯ production in the lepton+jets and dilepton channels in p+Pb collisions at √s.sub.NN./sub. = 8.16 TeV with the ATLAS detector

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

doi:https://dx.doi.org/10.1007/JHEP11(2024)101

Number of the records: 1

Observation of tt¯ production in the lepton+jets and dilepton channels in p+Pb collisions at √s.sub.NN./sub. = 8.16 TeV with the ATLAS detector

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SYSNO ASEP	0601884
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	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
Author(s)	Aad, G. (FR) Aakvaag, E. (NO) Abbott, B. (US) Chudoba, Jiří (FZU-D)_{RID, ORCID} Federičová, Pavla (FZU-D)_ORCID Hejbal, Jiří (FZU-D)_{RID, ORCID} Jačka, Petr (FZU-D)_ORCID Kepka, Oldřich (FZU-D)_{RID, ORCID} Kroll, Jiří (FZU-D)_ORCID Kupčo, Alexander (FZU-D)_{RID, ORCID} Latoňová, Věra (FZU-D)_ORCID Lokajíček, Miloš (FZU-D)_{RID, ORCID} Lysák, Roman (FZU-D)_{RID, ORCID} Marčišovský, Michal (FZU-D)_{RID, ORCID} Mikeštíková, Marcela (FZU-D)_{RID, ORCID} Němeček, Stanislav (FZU-D)_{RID, ORCID} Šícho, Petr (FZU-D)_{RID, ORCID} Staroba, Pavel (FZU-D)_{RID, ORCID} Svatoš, Michal (FZU-D)_{RID, ORCID} Taševský, Marek (FZU-D)_{RID, ORCID}
Number of authors	2900
Article number	101
Source Title	Journal of High Energy Physics. - : Springer - ISSN 1029-8479 Roč. 2024, č. 11 (2024)
Number of pages	38 s.
Language	eng - English
Country	DE - Germany
Keywords	ATLAS ; TeV ; dilepton ; muon ; electron
Subject RIV	BF - Elementary Particles and High Energy Physics
OECD category	Particles and field physics
R&D Projects	EH22_008/0004632 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Research Infrastructure	CERN-CZ III - 90240 - Fyzikální ústav AV ČR, v. v. i.
Method of publishing	Open access
Institutional support	FZU-D - RVO:68378271
UT WOS	001380766500002
EID SCOPUS	85210447863
DOI	https://doi.org/10.1007/JHEP11(2024)101
Annotation	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.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2025
Electronic address	https://hdl.handle.net/11104/0359187

Number of the records: 1