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Higgs Boson Properties at Colliders

Qian, Zhuoni (2017) Higgs Boson Properties at Colliders. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Since its discovery at the large hadron collider (LHC) in 2012, the Higgs boson and its properties are under intense investigation from both theorists and experimentalists. As the only scalar particle in the Standard Model (SM), the Higgs is believed to be closely related to the nature of electroweak symmetry breaking and the mass generation of fundamental massive particles. Respectively, they manifest as the couplings between the Higgs to the massive bosons (gauge couplings) and the Higgs to the massive fermions (Yukawa couplings). Thus, measurements of the Higgs sector properties are highly motivated either to confirm our current theory, the standard model, or to reveal possible new theories.
With the ongoing effort at the LHC, the Higgs is studied through various production and decay channels. However at a hadron collider, the large background and the ignorance of the partonic center of mass energy make testing many parameters of the Higgs sector challenging. For this dissertation I studied Higgs processes at a lepton collider, explored mass determination abilities for certain processes at a lepton collider and also studied the challenging Higgs decay to light jets at the LHC. These studies suggest new observables to improve our sensitivity to the Higgs sector and to constrain possible new physics deviations.
In order, I present in Chapter 1 an introduction of the Standard Model Higgs and its detection at colliders. Chapter 2 details the study on Higgs production through the ZZ fusion process at the lepton collider and the measurement of the inclusive rate. Our study improves the prospecting sensitivities on the standard model couplings, and puts further constraints on dimension-6 effective operators which are generic in quantifying beyond standard model (BSM) deviations. Chapter 3 describes the Higgs to light jets decays through the boosted Vh associated production at the LHC. Extrapolation of sensitivities on small Yukawa couplings at the hadron collider are discussed and achieved. Chapter 4 presents another study on linear collider, further exploring its many advantages on kinematic reconstruction and precision measurement.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Qian, Zhuonizhq8@pitt.eduzhq80000-0002-2914-7255
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairHan, Taothan@pitt.eduthan
Committee MemberAyres, Freitasafreitas@pitt.eduafreitas
Committee MemberAnna, Veinchteinaav4@pitt.eduaav4
Committee MemberJohn, Hillierhillier@pitt.eduhillier
Committee MemberJames, Muellermueller@pitt.edumueller
Date: 28 September 2017
Date Type: Publication
Defense Date: 1 May 2017
Approval Date: 28 September 2017
Submission Date: 3 July 2017
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 128
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Higgs, Colliders, ILC
Date Deposited: 29 Sep 2017 00:05
Last Modified: 29 Sep 2017 00:05


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