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

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

Description

Title

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

Author(s)

Zeng, JianCong

Issue Date

2024-07-10

Director of Research (if dissertation) or Advisor (if thesis)

Neubauer, Mark

Doctoral Committee Chair(s)

Hooberman, Benjamin

Committee Member(s)

• Fields, Brian D
• Kahn, Yonatan F

Department of Study

Physics

Discipline

Physics

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• Electroweak
• Vector boson scattering

Abstract

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.

Graduation Semester

2024-08

Type of Resource

Thesis

Handle URL

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

Copyright and License Information

Copyright 2024 JianCong Zeng

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