Abstract
The top quark is the heaviest known fundamental particle. As it is the only quark that decays before it hadronizes, it allows us to probe the properties of bare quarks at the Large Hadron Collider. Highlights of a few recent precision measurements by the ATLAS Collaboration of the top quark using 13 TeV and 8 TeV collision data will be presented: top-quark pair and single top production cross sections including differential distributions will be presented alongside measurements of top-quark properties, including results using boosted top quarks, probe our understanding of top-quark production in the TeV regime. Measurements of the top-quark mass and searches for rare top quark decays are also presented.
Highlights
New results with 36 fb−1@ 13 TeV σtZ(3 ) = 600 ± 170(stat) ± 140(syst) fb Single top w/ W boson in agreement with predictions Colour flow according to SM preferred by data
Measurement of the production cross-section of a single top quark in association with a Z boson in proton-proton collisions at 13 TeV with the ATLAS detector https://cds.cern.ch/record/2273868
Summary
New results with 20 fb−1 @ 8 TeV ALCHC8 = 0.0055 ± 0.0023(stat) ± 0.0025(syst) mtcoopmb = 172.51 ± 0.27(stat) ± 0.42(syst) GeV Γt = 1.76 ± 0.33(stat)+−00..7698(syst) GeV. New results with 14.7 fb−1 @ 13 TeV σtfitd(boost) = 374 ± 13(stat)+−19121(syst) fb. New results with 36 fb−1@ 13 TeV σtZ(3 ) = 600 ± 170(stat) ± 140(syst) fb Single top w/ W boson in agreement with predictions Colour flow according to SM preferred by data. Consistent MS and ID good quality track match pT > 25 GeV, |η| < 2.5 Separated from jets Track isolation. Track and calorimeter quality and match criteria, exclude 1.37 < |η| < 1.52 Cluster energy deposit shape ET > 15 GeV (pT > 25 GeV), |η| < 2.47 Jet overlap removal Track and energy isolation. Vector sum of transverse momenta of all calibratd leptons and jets, and unassociated PV
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