28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

Measurements of differential cross-sections of top-quark-antiquark pair-production with the ATLAS detector

28 Jul 2020, 17:45
25m
virtual conference

virtual conference

Talk 04. Top Quark and Electroweak Physics Top Quark and Electroweak Physics

Speaker

Teng Jian Khoo (University of Innsbruck (AT))

Description

Comprehensive measurements of differential cross-sections of top-quark-antiquark pair-production are presented. The measurements are performed in the electron-muon, the lepton+jets and the all-hadronic channels. The latter two allow for reconstruction of the top-quark and top-quark-pair kinematic distributions. In the electron-muon channel, kinematic properties of the two leptons are measured differentially. High sensitivity of some distributions to PDFs is demonstrated. The lepton+jets and all-hadronic channels are complementary in terms of range and resolution for several top-quark variables. All three measurements use data recorded in the years 2015 and 2016 during Run 2 of the LHC. The measurements are compared quantitatively with predictions from several setups of next-to-leading order matrix-element generators combined with parton-shower generators and from fixd order calculations at NNLO in QCD. In addition, the total cross-section is measured in the electron-muon channel. A precision of 2.4 % is reached, well below the uncertainty of predictions at next-to-next-to-leading order in QCD. The total cross-section is compared to predictions by different sets of parton distribution functions and is used to determine the top-quark mass. A total cross-section measurement based on the full Run 2 dataset in the lepton+jets channel is also presented.

Primary author

Teng Jian Khoo (University of Innsbruck (AT))

Presentation Materials