Measurements of asymmetries in top-quark production and tests of lepton universality in ATLAS

TL;DR

This paper reports on measurements of top-quark production asymmetries and tests of lepton universality using 13TeV ATLAS data, providing insights into fundamental particle properties and potential new physics.

Contribution

It presents the first test of lepton flavour universality in top-quark decays and precise asymmetry measurements at 13TeV, advancing understanding of top-quark properties.

Findings

Measured top-antitop charge asymmetry at 13TeV.

Performed the first test of lepton universality in top decays.

Results are consistent with Standard Model predictions.

Abstract

The top quark is the heaviest known fundamental particle. As it is the only quark that decays without hadronisation, it provides the unique opportunity to probe the properties of bare quarks at the Large Hadron Collider (LHC). This article will present two recent measurements of the top quark using 13TeV collision data with the ATLAS experiment: the top and anti-top quark pair charge asymmetry measurement alongside the first test of lepton flavour universality (LFU) of leptons to W bosons from tt events.