Measurement of the top quark pole mass using $\text{t}\bar{\text{t}}$+jet events in the dilepton final state at $\sqrt{s}=$ 13 TeV with the CMS experiment

TL;DR

This paper measures the top quark pole mass using $ ext{t}ar{ ext{t}}$+jet events in the dilepton final state at 13 TeV with CMS data, employing machine learning and unfolding techniques to compare with theoretical predictions.

Contribution

It introduces a novel measurement of the top quark pole mass using $ ext{t}ar{ ext{t}}$+jet events with advanced reconstruction and unfolding methods at 13 TeV.

Findings

Top quark pole mass measured as 172.94 ± 1.37 GeV.

Used machine learning for event reconstruction.

Compared measurements with NLO theoretical predictions.

Abstract

In this contribution, a measurement of the top quark pole mass $m_{\text{t}}^{\text{pole}}$ is presented. Events where a top quark-antiquark pair ($\text{t}\bar{\text{t}}$) is produced in association with at least one additional energetic jet ($\text{t}\bar{\text{t}}$+jet) are analyzed. The data set recorded by the CMS experiment at a center-of-mass energy of 13 TeV, corresponding to a total integrated luminosity of 36.3fb$^{-1}$, is used. Reconstructed events are required to contain two opposite-sign leptons in the final state. Machine learning methods are employed for the reconstruction of the main observable event classification. The normalized $\text{t}\bar{\text{t}}$+jet production cross section as a function of the inverse of the invariant mass of the $\text{t}\bar{\text{t}}$+jet system is measured at the parton level using a likelihood unfolding method. The value for $m_{\text{t}}^{\text{pole}}$ is extracted by comparing the measurement to next-to-leading order theoretical predictions using two parton distribution functions (PDFs). For a reference set of the ABMP16NLO PDF, the resulting value is $m_{\text{t}}^{\text{pole}} = 172.94\pm1.37$ GeV.