Wang, Xing
(2019)
Some Aspects of Higgs Physics and WIMP Dark Matter.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
The discovery of the Higgs boson at the CERN Large Hadron Collider (LHC) in 2012 has filled in the last missing piece of the Standard Model (SM). Yet we would like to know where the next physics scale above the electroweak scale lies. In this thesis, I focus on two directions to search for possible new physics beyond the SM: the Higgs boson and the dark matter.
As the recently discovered Higgs boson may serve as a lamppost for new physics search, it is of great importance to scrutinize its properties and look for possible deviations from the SM. In particular, we study the Higgs boson rare decays to a pair of fermions associated with a photon and its observability at the LHC, and exploit $h\rightarrow c\bar{c}\gamma$ to probe the charm-quark Yukawa coupling.
On the other hand, the existence of the dark matter has been well-established via many astronomical observations, in spite of its unknown particle origin. The TeV scale naturally appears if we assume that the correct dark matter abundance is achieved via thermal freeze-out with interaction strength of electroweak force, which is known as the ``WIMP miracle''. It is crucial to search for such dark matter particles at the colliders. Future high-energy colliders provide excellent environments not only for discovering such particles but also for examining its properties such as spin and coupling structure. We study the search strategies and the observability of weakly interacting massive particles (WIMP) with compressed spectra at the future colliders, and exploit single-photon
processes and antler-topology processes to determine not only the spins but also the coupling structures at future high-energy $e^+e^-$ colliders.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
27 September 2019 |
| Date Type: |
Publication |
| Defense Date: |
1 May 2019 |
| Approval Date: |
27 September 2019 |
| Submission Date: |
16 May 2019 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
225 |
| 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: |
Collider Phenomenology, Higgs, Dark Matter, WIMP |
| Date Deposited: |
27 Sep 2019 17:43 |
| Last Modified: |
27 Sep 2019 17:43 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/36740 |
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