Abstract
The highlights of the measurements of top quark production in proton-proton collisions at the Large Hadron Collider with the ATLAS detector are presented. The inclusive measurements of the top-pair production cross section have reached high precision and are compared to the best available theoretical calculations. The differential cross section measurements, including results using boosted top quarks, probe our understanding of top-pair production in the TeV regime. The results are compared to Monte Carlo generators implementing LO and NLO matrix elements matched with parton showers. Measurements of the single top quark production cross section are presented in the t -channel and s -channel, and with associated production with a W boson. For the t -channel production, results on the ratio between top quark and antitop quark production cross sections and differential measurements are also included.
Highlights
Millions of top quarks have been produced in proto√n-proton collisi√ons at the Large Ha√dron Collider (LHC) at three different center-of-mass energies: s = 7 TeV, s = 8 TeV, and s = 13 TeV allowing us to precisely measure its production cross sections
The results are compared to Monte Carlo generators implementing LO and NLO matrix elements matched with parton showers
The single top production consists of three separate physics processes: t-channel production, s-channel production and production associated with a W boson (Wt)
Summary
The measurement is performed in the full phase space and unfolded to parton level, where the differential cross section is expressed as a function of the pT of the top quark. The unfolding was performed to particle level with the differential cross section expressed as a function of the pT of the large radius jet in a fiducial phase space similar to the selection criteria. The measurement using data differential cross section is measured in a fiducial phase space as a function of the pT and absolute rapidity of the top quark, and of the pT, absolute rapidity and invariant mass of the ttsystem, where the top quark is defined using particle-level objects. A similar inconsistency between data and the Powheg-Box + Herwig++ prediction is observed for the top quark pT spectrum, while the other MC predictions are consistent with data
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