Home > Research > Publications & Outputs > Measurement of the tt¯ production cross-section...

Links

Text available via DOI:

View graph of relations

Measurement of the tt¯ production cross-section and lepton differential distributions in eμ dilepton events from pp collisions at √s=13TeV with the ATLAS detector

Research output: Contribution to journalJournal articlepeer-review

Published
Article number528
<mark>Journal publication date</mark>12/06/2020
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number6
Volume80
Number of pages70
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The inclusive top quark pair (tt¯) production cross-section σtt¯ has been measured in proton–proton collisions at √s=13TeV, using 36.1 fb- 1 of data collected in 2015–2016 by the ATLAS experiment at the LHC. Using events with an opposite-charge pair and b-tagged jets, the cross-section is measured to be: σtt¯=826.4±3.6(stat)±11.5(syst)±15.7(lumi)±1.9(beam)pb, where the uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, the integrated luminosity, and the LHC beam energy, giving a total uncertainty of 2.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. It is used to determine the top quark pole mass via the dependence of the predicted cross-section on mtpole, giving mtpole=173.1-2.1+2.0GeV. It is also combined with measurements at √s=7TeV and √s=8TeV to derive ratios and double ratios of tt¯ and Z cross-sections at different energies. The same event sample is used to measure absolute and normalised differential cross-sections as functions of single-lepton and dilepton kinematic variables, and the results are compared with predictions from various Monte Carlo event generators. © 2020, CERN for the benefit of the ATLAS collaboration.