New Methods for Top-Quark Mass Measurements at the LHC

TL;DR

This paper reviews recent alternative methods for measuring the top-quark mass at the LHC, highlighting new observables, techniques, and production modes that improve systematic understanding and consistency of results.

Contribution

It introduces novel measurement approaches using alternative observables and production channels, enhancing the precision and robustness of top-quark mass determinations.

Findings

Different techniques yield consistent top-quark mass results.

Alternative observables help reduce systematic uncertainties.

Mass measurements from electroweak-mediated single top production agree with standard methods.

Abstract

Several recent new measurements of the top-quark mass that use alternative observables and reconstruction techniques are presented, performed by the ATLAS and CMS collaborations at the CERN LHC. Alternative observables can help provide insight by presenting different systematic sensitivities and by constraining prevailing systematic uncertainties of standard measurements, such as jet energy calibrations. Furthermore, the top-quark mass is extracted from theoretically well-defined observables, such as the inclusive production cross section for top quark pairs. Finally, the mass is measured in event topologies dominated by electroweak-mediated single top production by both experiments. The results of different techniques and production modes are found to be consistent with what is obtained in standard measurements.