Precise measurement of the $t\bar{t}$ production cross-section and lepton differential distributions in $e\mu$ dilepton events

TL;DR

This paper reports precise measurements of top-quark pair production cross-sections and lepton distributions in proton-proton collisions at 13 TeV, using ATLAS data, and explores implications for the top-quark mass.

Contribution

It provides the first detailed differential and inclusive $tar{t}$ cross-section measurements at 13 TeV with a large dataset, and uses these to determine the top-quark pole mass.

Findings

Measured inclusive $tar{t}$ cross-section with high precision.

Provided differential distributions of leptons in $tar{t}$ events.

Estimated the top-quark pole mass from cross-section dependence.

Abstract

Measurements of the inclusive and differential top-quark pair ($t\bar{t}$) cross-sections in proton--proton collisions at $\sqrt{s} = 13$ TeV, using 140 fb$^{-1}$ of data collected by the ATLAS experiment at the Large Hadron Collider, are presented. Events with an opposite-charge $e\mu$ pair and $b$-tagged jets are selected, and the inclusive cross-section measurement is used to determine the top-quark pole mass via the dependence of the predicted cross-section on $m_t^\mathrm{pole}$. Complementary measurements of $e\mu b\bar{b}$ production, treating both $t\bar{t}$ and $tW$ events as signal, are also provided.