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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00601884" target="_blank" >RIV/68378271:_____/24:00601884 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989592:15310/24:73627790

Výsledek na webu

<a href="https://hdl.handle.net/11104/0359187" target="_blank" >https://hdl.handle.net/11104/0359187</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP11(2024)101" target="_blank" >10.1007/JHEP11(2024)101</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Výzkum základních stavebních kamenů hmoty s využitím špičkových technologií</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Svazek periodika

2024

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

38

Strana od-do

101

Kód UT WoS článku

001380766500002

EID výsledku v databázi Scopus

2-s2.0-85210447863