Differential tt(bar) cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb-1 of ATLAS data

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10475911" target="_blank" >RIV/00216208:11320/23:10475911 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=OvnmoTap9a" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=OvnmoTap9a</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP04(2023)080" target="_blank" >10.1007/JHEP04(2023)080</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Differential tt(bar) cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb-1 of ATLAS data

Popis výsledku v původním jazyce

Measurements of single-, double-, and triple-differential cross-sections are presentedfor boosted top-quark pair-production in 13 TeV proton-proton collisions recordedby the ATLAS detector at the LHC. The top quarks are observed through their hadronicdecay and reconstructed as large-radius jets with the leading jet having transverse momentum(pT) greater than 500 GeV. The observed data are unfolded to remove detectoreffects. The particle-level cross-section, multiplied by the t-t ! WWb-b branching fractionand measured in a fiducial phase space defined by requiring the leading and second-leadingjets to have pT &gt; 500 GeV and pT &gt; 350 GeV, respectively, is 331 +- 3(stat.) +- 39(syst.) fb.This is approximately 20% lower than the prediction of 398+48-49 fb by Powheg+Pythia 8with next-to-leading-order (NLO) accuracy but consistent within the theoretical uncertainties.Results are also presented at the parton level, where the effects of top-quarkdecay, parton showering, and hadronization are removed such that they can be comparedwith fixed-order next-to-next-to-leading-order (NNLO) calculations. The partonlevelcross-section, measured in a fiducial phase space similar to that at particle level, is1.94 +- 0.02(stat.) +- 0.25(syst.) pb. This agrees with the NNLO prediction of 1.96+0.02-0.17 pb.Reasonable agreement with the differential cross-sections is found for most NLO models,while the NNLO calculations are generally in better agreement with the data. The differentialcross-sections are interpreted using a Standard Model effective field-theory formalismand limits are set on Wilson coefficients of several four-fermion operators.

Název v anglickém jazyce

Differential tt(bar) cross-section measurements using boosted top quarks in the all-hadronic final state with 139 fb-1 of ATLAS data

Popis výsledku anglicky

Measurements of single-, double-, and triple-differential cross-sections are presentedfor boosted top-quark pair-production in 13 TeV proton-proton collisions recordedby the ATLAS detector at the LHC. The top quarks are observed through their hadronicdecay and reconstructed as large-radius jets with the leading jet having transverse momentum(pT) greater than 500 GeV. The observed data are unfolded to remove detectoreffects. The particle-level cross-section, multiplied by the t-t ! WWb-b branching fractionand measured in a fiducial phase space defined by requiring the leading and second-leadingjets to have pT &gt; 500 GeV and pT &gt; 350 GeV, respectively, is 331 +- 3(stat.) +- 39(syst.) fb.This is approximately 20% lower than the prediction of 398+48-49 fb by Powheg+Pythia 8with next-to-leading-order (NLO) accuracy but consistent within the theoretical uncertainties.Results are also presented at the parton level, where the effects of top-quarkdecay, parton showering, and hadronization are removed such that they can be comparedwith fixed-order next-to-next-to-leading-order (NNLO) calculations. The partonlevelcross-section, measured in a fiducial phase space similar to that at particle level, is1.94 +- 0.02(stat.) +- 0.25(syst.) pb. This agrees with the NNLO prediction of 1.96+0.02-0.17 pb.Reasonable agreement with the differential cross-sections is found for most NLO models,while the NNLO calculations are generally in better agreement with the data. The differentialcross-sections are interpreted using a Standard Model effective field-theory formalismand limits are set on Wilson coefficients of several four-fermion operators.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

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

2023

Číslo periodika v rámci svazku

04

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

108

Strana od-do

080

Kód UT WoS článku

001022682600001

EID výsledku v databázi Scopus

2-s2.0-85156104827