학술논문
Measurement of the top quark pole mass using tt¯s+jet events in the dilepton final state in proton-proton collisions at tt¯s = 13 TeV
Document Type
Original Paper
Author
Source
Journal of High Energy Physics. 2023(7)
Subject
Language
English
ISSN
1029-8479
Abstract
Abstract: A measurement of the top quark pole mass mtpolett¯tt¯stt¯mtpole in events where a top quark-antiquark pair (mtpolett¯tt¯stt¯mtpole) is produced in association with at least one additional jet (mtpolett¯tt¯stt¯mtpole+jet) is presented. This analysis is performed using proton-proton collision data at mtpolett¯tt¯stt¯mtpole = 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to a total integrated luminosity of 36.3 fb−1 . Events with two opposite-sign leptons in the final state (e+ e− , μ+ μ− , e± μ∓ ) are analyzed. The reconstruction of the main observable and the event classification are optimized using multivariate analysis techniques based on machine learning. The production cross section is measured as a function of the inverse of the invariant mass of the mtpolett¯tt¯stt¯mtpole+jet system at the parton level using a maximum likelihood unfolding. Given a reference parton distribution function (PDF), the top quark pole mass is extracted using the theoretical predictions at next-to-leading order. For the ABMP16NLO PDF, this results in mtpolett¯tt¯stt¯mtpole = 172.93 ± 1.36 GeV.