Abstract
Measurements of the inclusive and differential cross-sections for top quark pair and single top production cross-sections in proton-proton collisions with the ATLAS detector at the Large Hadron Collider (LHC) are presented at centre-of-mass energies of 8 TeV and 13 TeV. These measurements reach high precision and are compared to the best available theoretical calculations. The differential measurements, including results using boosted topology, probe our understanding of top quark pair production in the TeV regime. Measurements of top-quark pair with additional jets enable the study of effect of gluon radiation, especially the measurement with additional heavy flavour jets provides test of multi-scale QCD calculation. The first evidence of single top quark production in the s-channel is quoted. Interference of top quark pair and single top productions is investigated, and the single top production cross-section in association with a Z boson is measured. Measurements of the properties of the Wtb vertex in single top quark production allow to set limits on anomalous couplings.
Highlights
Even after more than two decades from its discovery, the unique properties of the top quark are still intriguing the researchers
With its mass close to the electroweak symmetry breaking scale, it is the heaviest of all known particles of the Standard Model (SM) [1]. This implies large couplings with the Higgs boson and with new particles predicted in physics beyond the SM (BSM)
Email address: akanksha.vishwakarma@desy.de (Akanksha Vishwakarma) production it a large background to many important and rare processes, it is crucial to understand and model this process with great precision. This overview presents recent measurements of single top and ttproduction cross-section performed by the A√TLAS collaboration [2] using the 2015-2016 data at s = 13 TeV and 2012 data at 8 TeV
Summary
Even after more than two decades from its discovery, the unique properties of the top quark are still intriguing the researchers. With its mass close to the electroweak symmetry breaking scale, it is the heaviest of all known particles of the Standard Model (SM) (mt = 173.3 ± 0.7 GeV) [1] This implies large couplings with the Higgs boson (yt ∼ 1) and with new particles predicted in physics beyond the SM (BSM). The measurements are performed at different centre-of-mass energies, in different decay channels and are found to be in good agreement with the SM predictions within the uncertainties. The events are required to contain either one electron or one muon; the sample is split into three signal regions with different jet multiplicities and number of b-tagged jets, in order to reduce the most relevant uncertainties coming from jet-energy scale and b-tagging efficiency. This analysis strategy improved the previous result which achieved a total uncertainty of 9.4% [7] using the same dataset
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