Study of electroweak WW/WZ production in the semileptonic final states in association with a high-mass dijet system using the ATLAS detector

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2024

Author dc:creator

• Zeng, JianCong

Contributors dc:contributor

• Neubauer, Mark
• Hooberman, Benjamin
• Fields, Brian D
• Kahn, Yonatan F

• Electroweak
• Vector Boson Scattering

Statement dc:rights

• Copyright 2024 JianCong Zeng

Language dc:language

en, eng

Handle dc:identifier

https://hdl.handle.net/2142/125586

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F125586