Higgs Boson Phenomenology at the LHC: the Standard Model and BeyondLeung, Sze Ching (2023) Higgs Boson Phenomenology at the LHC: the Standard Model and Beyond. Doctoral Dissertation, University of Pittsburgh. (Unpublished)
AbstractThis thesis focuses on exploring the interactions of the Higgs boson with other particles and their connections to Beyond the Standard Model (BSM) physics at the future High Luminosity LHC (HL-LHC). Four studies are presented to probe the Higgs boson couplings at high energy scales and test for new physics effects. In Chapter 2, a novel search strategy is proposed to study the Higgs decay $H\to c\bar c$ in association with vector boson fusion (VBF) jets and a photon. The photon acts as an effective trigger handle, suppressing the challenging QCD background. The projected sensitivity for $H\to c\bar c$ at HL-LHC is about 13 times the SM charm-Yukawa coupling. Chapter 3 explores the sensitivity to off-shell Higgs boson measurements in the process $pp\to H^* \to Z(l^+l^-) Z(\nu\bar{\nu})$ at HL-LHC. Machine-learning techniques are employed to enhance the sensitivity, leading to significant results beyond existing literature. In Chapter 4, the $pp\to t\bar{t}H$ process at the HL-LHC is used to probe the coupling between the Higgs boson and the top quark at high energy scales. The study focuses on the boosted Higgs regime with jet substructure techniques, resulting in a strong sensitivity to the new physics scale. Chapter 5 investigates the sensitivity to high momentum Higgs boson production through VBF. We show that even with the challenging channel $H \to b\bar{b}$, new physics up to TeV scale can be reached at the HL-LHC. We also first point out that comparable sensitivity can be obtained with the VBF jet kinematics without reconstructing the Higgs boson. Share
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