2026-09-23T13:42:44Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/125586 2025-02-06 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

application/pdf en text Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms The student, JianCong Zeng, accepted the attached license on 2024-07-08 at 22:11. The student, JianCong Zeng, submitted this Dissertation for approval on 2024-07-08 at 22:26. This Dissertation was approved for publication on 2024-07-10 at 15:49. DSpace SAF Submission Ingestion Package generated from Vireo submission #20994 on 2025-02-04 at 21:04:43 Study of electroweak WW/WZ production in the semileptonic final states in association with a high-mass dijet system using the ATLAS detector Zeng, JianCong 2024-07-10 Neubauer, Mark Hooberman, Benjamin Fields, Brian D Kahn, Yonatan F Electroweak Vector Boson Scattering eng The analysis searches for electroweak 2 diboson (WW/WZ/ZZ) production in association with a high-mass dijet system, using data from proton-proton collisions at a center-of-mass energy of √s = 13TeV ; the total dataset corresponds to an integrated luminosity of 139 fb−1. The analysis is performed in the semileptonic final states which include a hadronic decay boson and a leptonic decay one. The analysis is split into three channels according to the number of electrically charged leptons from the leptonic boson decay: 0-lepton channel, 1-lepton channel, and 2-lepton channel. The focus of this thesis is an approach to enhance the separation between the VBS signal and the backgrounds in the 1-lepton channel using artificial neural network models. This approach is developed using Monte Carlo simulated events in the semi-leptonic VBS analysis and tested using ATLAS data for improving the sensitivity of the analysis to the target signal. The semileptonic vector boson scattering production of WW/WZ in the 1-lepton channel is measured with an observed (expected) significance of 5.78σ (5.98σ) standard deviations. 2024-08 Thesis https://hdl.handle.net/2142/125586 Copyright 2024 JianCong Zeng Physics Physics University of Illinois at Urbana-Champaign Ph.D. Dissertation