NNLO fits of top-quark mass using total, single-differential and double-differential $t\bar{t}+X$ cross-section data

TL;DR

This paper performs NNLO fits of the top-quark mass using detailed $t\bar{t}+X$ cross-section data from ATLAS and CMS, comparing various PDF sets and analyzing dataset consistency.

Contribution

It introduces a comprehensive NNLO fitting procedure for top-quark mass using double-differential cross-section data and assesses the impact of different PDF sets and dataset tensions.

Findings

Fits are compatible across different PDF sets within uncertainties.

Some tension observed among fits to different datasets.

Results contribute to precise top-quark mass determination.

Abstract

We describe the fits of the top-quark mass value at NNLO using as input the double-differential distributions in rapidity and invariant mass of $t\bar{t}$ pairs obtained by the ATLAS and CMS collaborations from unfolding of their experimental data to the parton level, compared to NNLO theory predictions. We consider different state-of-the-art PDF sets, finding results of the fits compatible among each other within uncertainties. On the other hand, we observe some tension among the fits to different datasets.