Observation of t(t)over-bar Production in Pb plus Pb Collisions at √SNN=5.02 TeV with the ATLAS Detector
- NázevTitle
- Observation of t(t)over-bar Production in Pb plus Pb Collisions at √SNN=5.02 TeV with the ATLAS DetectorObservation of t(t)over-bar Production in Pb plus Pb Collisions at √SNN=5.02 TeV with the ATLAS Detector
- Druh výsledkuResult type
- Článek v časopiseJournal article
- AutořiAuthors
- G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, B. Ali, K. Augsten, B. Bergmann, H. Day-Hall, P. Fiedler, Z. Hubáček, S. Mondal, M. Myška, V. Petousis, S. Pospíšil, K. Smolek, A. Sopczak, V. Vacek, P. Vokáč, O. Zaplatílek
- DOIDOI
- 10.1103/PhysRevLett.134.142301
- Časopis / citaceJournal / citation
- Physical Review Letters. 2025, 134(14), ISSN 1079-7114.
- RokYear
- 2025
- JazykLanguage
- eng
- WoSWoS
- 001505417900001
- ScopusScopus
- 2-s2.0-105003765541
- RIVRIV
- RIV/68407700:21220/25:00388709!RIV26-MSM-21220___
- ProjektProject
- CERN-CZ III - Výzkumná infrastruktura pro experimenty v CERN - LM2023040 (2023–2026)CERN-CZ III - Výzkumná infrastruktura pro experimenty v CERN - LM2023040 (2023–2026); Institucionální podpora na rozvoj výzkumné org.Institucionální podpora na rozvoj výzkumné org.; Výzkum základních stavebních kamenů hmoty s využitím špičkových technologiíFundamental constituents of matter through frontier technologies
AbstraktAbstract
Top-quark pair production is observed in lead-lead (Pb+Pb) collisions at root s(NN)=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 sigma(t (t) over bar) =3.6 (+1.0)(-0.9)(stat)(-0.5) (+0.8)(syst) mu b, 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.
Top-quark pair production is observed in lead-lead (Pb+Pb) collisions at root s(NN)=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 sigma(t (t) over bar) =3.6 (+1.0)(-0.9)(stat)(-0.5) (+0.8)(syst) mu b, 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.