학술논문
Measurement of the cross section of top quark-antiquark pair production in association with a W boson in proton-proton collisions at s = 13 TeV
Document Type
Original Paper
Author
Source
Journal of High Energy Physics. 2023(7)
Subject
Language
English
ISSN
1029-8479
Abstract
Abstract: The production of a top quark-antiquark pair in association with a W boson (tt¯Wtt¯Wtt¯Wtt¯W1.61±0.15stat−0.05+0.07syst) is measured in proton-proton collisions at a center-of-mass energy of 13 TeV. The analyzed data was recorded by the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 138 fb−1 . Events with two or three leptons (electrons and muons) and additional jets are selected. In events with two leptons, a multiclass neural network is used to distinguish between the signal and background processes. Events with three leptons are categorized based on the number of jets and of jets originating from b quark hadronization, and the lepton charges. The inclusive tt¯Wtt¯Wtt¯Wtt¯W1.61±0.15stat−0.05+0.07syst production cross section in the full phase space is measured to be 868 ± 40(stat) ± 51(syst) fb. The tt¯Wtt¯Wtt¯Wtt¯W1.61±0.15stat−0.05+0.07syst+ and tt¯Wtt¯Wtt¯Wtt¯W1.61±0.15stat−0.05+0.07syst− cross sections are also measured as 553 ± 30(stat) ± 30(syst) and 343 ± 26(stat) ± 25(syst) fb, respectively, and the corresponding ratio of the two cross sections is found to be tt¯Wtt¯Wtt¯Wtt¯W1.61±0.15stat−0.05+0.07syst. The measured cross sections are larger than but consistent with the standard model predictions within two standard deviations, and represent the most precise measurement of these cross sections to date.