SMuK 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 135: Top Mass, Top BSM

T 135.4: Vortrag

Donnerstag, 23. März 2023, 18:15–18:30, HSZ/0201

Measurement of the top quark pole mass using tt +1 jet events with the CMS experiment — •Ana Ventura Barroso, Sebastian Wuchterl, Roman Kogler, and Katerina Lipka — Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg

The top quark is the most massive elementary particle known. Its mass,m_t, is a fundamental parameter of the Standard Model, and its value needs to be determined experimentally. However, direct top quark mass measurements suffer from ambiguities in their interpretation because of nonperturbative effects.

In this work, the pole mass of the top quark is extracted from a precise measurement of the distribution in ρ, in events where the tt system is produced in association with at least one additional jet. The variable ρ is defined as the inverse of the invariant mass of the tt+jet system. This observable has been chosen due to strongest sensitivity to m_t at the threshold of the tt+jet production. The analysis is performed using proton-proton collision data collected by the CMS experiment in 2016-2018 with √s=13 TeV, corresponding to a total integrated luminosity of 138 fb⁻¹. Events with two opposite-sign leptons in the final state are analyzed and the cross section is measured at the parton level using a likelihood unfolding method.