Observation of t(t)over-bar Production in Pb plus Pb Collisions at root SNN=5.02 TeV with the ATLAS Detector

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00388709" target="_blank" >RIV/68407700:21220/25:00388709 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21240/25:00388709 RIV/68407700:21340/25:00388709 RIV/68407700:21670/25:00388709
Result on the web
<a href="https://doi.org/10.1103/PhysRevLett.134.142301" target="_blank" >https://doi.org/10.1103/PhysRevLett.134.142301</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.134.142301" target="_blank" >10.1103/PhysRevLett.134.142301</a>

Result language
angličtina
Original language name
Observation of t(t)over-bar Production in Pb plus Pb Collisions at root SNN=5.02 TeV with the ATLAS Detector
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics

Project
<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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