Study of methods of resolved top quark reconstruction in semileptonic $t\bar{t}$ decay

TL;DR

This paper compares and improves methods for reconstructing top quark kinematics in semileptonic $t\bar{t}$ decays, analyzing their performance at particle and detector levels to enhance accuracy in high energy physics measurements.

Contribution

It evaluates existing pseudo-top reconstruction algorithms and proposes improvements to better reconstruct the top-quark mass and correlations across different analysis levels.

Findings

Improved top-quark mass line shape reconstruction.

Enhanced correlation between detector, particle, and parton levels.

Insights into algorithm performance for unfolding procedures.

Abstract

Study of methods of resolved top quarks kinematic reconstruction in the $t\bar{t} \rightarrow \ell+$jets channel is presented at the particle level as well as the fast-simulation detector level. Previous and current pseudo-top quark reconstruction algorithms are compared with suggestions presented on how to improve the reconstructed top-quark mass line shape, including the check of performance on physics observables in terms of correlations between detector, particle and parton levels, and in unfolding, with implications for current high energy physics experiments.