Inclusive and differential cross-section measurements of t(t)over-barZ production in pp collisions at √s=13 TeV with the ATLAS detector, including EFT and spin-correlation interpretations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F24%3A73628591" target="_blank" >RIV/61989592:15310/24:73628591 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/JHEP07(2024)163" target="_blank" >https://link.springer.com/article/10.1007/JHEP07(2024)163</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP07(2024)163" target="_blank" >10.1007/JHEP07(2024)163</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Inclusive and differential cross-section measurements of t(t)over-barZ production in pp collisions at √s=13 TeV with the ATLAS detector, including EFT and spin-correlation interpretations

Popis výsledku v původním jazyce

Measurements of both the inclusive and differential production cross sections of a top-quark-top-antiquark pair in association with a Z boson (t (t) over barZ) are presented. Final states with two, three or four isolated leptons (electrons or muons) are targeted. The measurements use the data recorded by the ATLAS detector in pp collisions at root s = 13 TeV at the Large Hadron Collider during the years 2015-2018, corresponding to an integrated luminosity of 140 fb(-1). The inclusive cross section is measured to be sigma(t (t) over barZ) = 0.86 +/- 0.04 (stat.) +/- 0.04 (syst.) pb and found to be in agreement with the most advanced Standard Model predictions. The differential measurements are presented as a function of a number of observables that probe the kinematics of the t (t) over barZ system. Both the absolute and normalised differential cross-section measurements are performed at particle level and parton level for specific fiducial volumes, and are compared with NLO+NNLL theoretical predictions. The results are interpreted in the framework of Standard Model effective field theory and used to set limits on a large number of dimension-6 operators involving the top quark. The first measurement of spin correlations in t (t) over barZ events is presented: the results are in agreement with the Standard Model expectations, and the null hypothesis of no spin correlations is disfavoured with a significance of 1.8 standard deviations.

Název v anglickém jazyce

Inclusive and differential cross-section measurements of t(t)over-barZ production in pp collisions at √s=13 TeV with the ATLAS detector, including EFT and spin-correlation interpretations

Popis výsledku anglicky

Measurements of both the inclusive and differential production cross sections of a top-quark-top-antiquark pair in association with a Z boson (t (t) over barZ) are presented. Final states with two, three or four isolated leptons (electrons or muons) are targeted. The measurements use the data recorded by the ATLAS detector in pp collisions at root s = 13 TeV at the Large Hadron Collider during the years 2015-2018, corresponding to an integrated luminosity of 140 fb(-1). The inclusive cross section is measured to be sigma(t (t) over barZ) = 0.86 +/- 0.04 (stat.) +/- 0.04 (syst.) pb and found to be in agreement with the most advanced Standard Model predictions. The differential measurements are presented as a function of a number of observables that probe the kinematics of the t (t) over barZ system. Both the absolute and normalised differential cross-section measurements are performed at particle level and parton level for specific fiducial volumes, and are compared with NLO+NNLL theoretical predictions. The results are interpreted in the framework of Standard Model effective field theory and used to set limits on a large number of dimension-6 operators involving the top quark. The first measurement of spin correlations in t (t) over barZ events is presented: the results are in agreement with the Standard Model expectations, and the null hypothesis of no spin correlations is disfavoured with a significance of 1.8 standard deviations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

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

—

Svazek periodika

2024

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

108

Strana od-do

"163-1"-"163-108"

Kód UT WoS článku

001394631700001

EID výsledku v databázi Scopus

2-s2.0-85199420138