Experimental systematic uncertainties (and object reconstruction) on top physics, their correlations, comparison ATLAS vs CMS (vs Tevatron) and common agreements

TL;DR

This paper compares the systematic uncertainties in top quark object reconstruction and calibration between ATLAS, CMS, and Tevatron, focusing on jet energy scale, b-tagging, and background estimation, highlighting correlations and agreements.

Contribution

It provides a detailed comparison of systematic uncertainties and their correlations across experiments, proposing a categorization and common understanding.

Findings

Identifies key sources of uncertainties in jet energy scale and b-tagging.

Proposes a categorization scheme for uncertainty sources.

Highlights agreements and differences between ATLAS, CMS, and Tevatron.

Abstract

The experimental systematic uncertainties associated to the reconstruction and calibration of the objects appearing in top quark final states at the LHC and Tevatron are discussed. The strategies followed in the ATLAS and CMS experiments are compared in detail for the cases of the jet energy scale and $b$-tagging calibrations, where a categorisation of the associated uncertainty sources as well as the corresponding correlations across experiments has been proposed. The estimate of the non-prompt and fake lepton background to the top quark leptonic channels is also discussed.