Latest ATLAS measurements of top quark properties using ${\rm t{\bar t}}$ events

TL;DR

This paper reports recent ATLAS measurements of various top quark properties in proton-proton collisions at 8 and 13 TeV, confirming consistency with Standard Model predictions.

Contribution

It provides new experimental results on top quark width, spin, polarization, W boson helicity, charge and CP asymmetries, and colour flow effects using ${\rm t\bar{t}}$ events.

Findings

All measurements are consistent with Standard Model expectations.

New insights into top quark spin correlations and colour flow.

Precise determinations of W boson helicity fractions.

Abstract

Recent measurements of top quark properties with ${\rm t{\bar t}}$ events collected by the ATLAS experiment in proton-proton collisions at the center of mass energy $\sqrt{s}=8$ and $13$ TeV, are presented. The measurements of the top quark width, spin and spin correlations, polarisation, the $W$ boson helicity fractions, charge and CP asymmetries are discussed. Finally, recent results obtained on colour flow effects in ${\rm t{\bar t}}$ events are presented. All the measurements are consistent with the Standard Model expectations.