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

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.

Talk at the 18th International Workshop on Top Quark Physics (Top2025), 21-26 September 2025