Abstract
A selection of recent top quark measurements performed with the ATLAS detector is presented here, with data taken in 2011 and 2012 at centre-of-mass energies of 7 TeV and 8 TeV, respectively. The analyses cover the determination of the top pole mass by a cross-section measurement, the top/anti-top quark mass difference, the spin correlation and the charge asymmetry. No hints for physics beyond the Standard Model have been found but a great reduction of uncertainties compared to former results was achieved.
Highlights
The top quark is the heaviest elementary particle known today and has a strong connection to the Higgs particle and the vacuum stability
4.7 fb−1 ttevent recorded at the ATLAS detector in the lepton+jets channel was reconstructed with a kinematic χ2 fitter method while the top/anti-top mass difference was set as free parameter
Charge asymmetry measurements in ttevents are an important test of higher order QCD, deviations from the theoretical predictions could point to new physics
Summary
The top quark is the heaviest elementary particle known today and has a strong connection to the Higgs particle and the vacuum stability. Precision studies testing the physics of the Standard Model (SM) and beyond are driven by top quark measurements. The top lifetime τtop ≈ 0.5 × 10−25 s [1] is very short which does not allow hadronisation before its decay, giving the opportunity to study a bare quark with its initial properties. The advantage of the ATLAS experiment [2] compared to former experiments, is the high amount of top quarks produced in proton-proton collisions at the LHC. The production channel is dominated by the strong interaction and the main process is the gluon-gluon fusion
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