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Electroweak and Higgs physics at high energies

Ma, Yang (2022) Electroweak and Higgs physics at high energies. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Though the Standard Model (SM) of particle physics is one of the most successful achievements in modern physics and has been confirmed with almost all experimental results, it fails to explain mysteries such as the strong CP problem, the nature of dark matter, and the origin of neutrino mass, etc. Along this line, it is important to study phenomena at high-energy colliders to precisely test the SM and search for the hint of new physics beyond the SM. This thesis contains works in the following two related directions.

For future ultra-high-energy colliders where the collisions happen at energies well above the electroweak scale, the heavy SM particles could also be radiated off the beams. For the phenomenology studies at future high-energy colliders, all the SM particles should be treated as ``partons'' and a proper parton distribution function is needed. In this thesis, the electroweak parton distribution functions (EW PDFs) framework is introduced, where the Dokshitzer–Gribov–Lipatov–Altarelli–Parisi (DGLAP) evolution is employed to sum the large logarithms to obtain the EW PDFs at the Leading-Log accuracy. Using the EW PDFs formalism, partonic luminosities of a possible high-energy muon collider and the cross sections of typical SM processes are calculated to show the partonic picture of future ultra-high-energy lepton colliders.

The discovery of the Higgs boson at the Large Hadron Collider (LHC) is a milestone in particle physics. Since it is directly related to the electroweak symmetry breaking mechanism, Higgs is regarded as the portal to new physics. In this thesis, we suggest two approaches to test the Muon-Higgs coupling and the Charm-Higgs coupling respectively. By calculating the multi-boson production processes at a future multi-TeV muon collider, we show that it is possible to precisely measure the Muon-Higgs coupling. Using the non-relativistic QCD framework, we study the Higgs boson decay to a $J/\psi$ and a pair of free charm quarks and show the possibility to measure the Charm-Higgs coupling at a $3~{\rm ab}^{-1}$ high-luminosity LHC.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Ma, Yangmayangluon@pitt.eduyam240000-0002-9419-6598
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairHan,
Committee MemberBatell,
Committee MemberPaolone,
Committee MemberPaulini,
Committee MemberZentner,
Date: 12 October 2022
Date Type: Publication
Defense Date: 19 September 2022
Approval Date: 12 October 2022
Submission Date: 13 June 2022
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 161
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: Particle Physics, Standard Model, Collider Physics, Electroweak Physics, Higgs Physics
Date Deposited: 12 Oct 2022 15:17
Last Modified: 12 Oct 2022 15:17


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