Differential $t\bar{t}$ Cross Section Measurements as a Function of Variables other than Kinematics

TL;DR

This paper reviews measurements of top-antitop quark pair production cross sections related to jet multiplicities and kinematics at the LHC, comparing experimental results with various theoretical models.

Contribution

It provides a comprehensive overview of differential cross section measurements as functions of non-kinematic variables in $t\bar{t}$ production, highlighting comparisons with different theoretical predictions.

Findings

Measurements span multiple energies and decay channels.

Significant differences observed between models and data.

Uncertainties mainly from parton shower modeling.

Abstract

An overview of cross section measurements as a function of jet multiplicities and jet kinematics in association with $t\bar{t}$ production is presented. Both the ATLAS and the CMS collaborations performed a large number of measurements at different center-of-mass energies of the LHC using various $t\bar{t}$ decay channels. Theoretical predictions of these quantities usually rely on parton shower simulations that strongly depends on tunable parameters and come with large uncertainties. The measurements are compared to various theoretical descriptions based on different combinations of matrix-element calculations and parton-shower models.