Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/135884
Type: | Thesis |
Title: | Broken flavour-symmetry induced state mixing in lattice QCD+QED |
Author: | Kordov, Zeno Rafael |
Issue Date: | 2022 |
School/Discipline: | School of Physical Sciences |
Abstract: | Lattice QCD affords us the unique opportunity to study the quark structure of hadrons non-perturbatively, through the couplings of quark- field operators to hadron mass-eigenstates. In this thesis, we study cases of flavour wavefunction mixing which are induced by broken flavour-symmetry, with particular consideration for the effects of isospin-breaking and electromagnetism. Namely, we investigate mixing between the octet baryons 0 and , and the pseudoscalar mesons 0, and 0, respectively. The latter scenario introduces the computational challenge of calculating disconnected quark-loop diagrams on the lattice, and we have investigated various techniques for improving the calculation. Additionally, we calculate the masses of the pseudoscalar mesons in lattice QCD+QED simulations, and investigate their behaviour with respect to the flavour-symmetry features observed through the state mixing. Finally, we detail and present lattice determinations of the weak decay constants of the pseudoscalar mesons, with the investigation being informed by the aforementioned state mixing. The results obtained from lattice simulations in each investigation are used to t quark mass and charge extrapolations for the relevant quantities. |
Advisor: | Young, Ross Zanotti, James |
Dissertation Note: | Thesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2022 |
Keywords: | Hadron spectroscopy Lattice QCD State mixing Meson Baryon Flavour symmetry Isospin breaking QCD+QED Operator renormalization Pseudoscalar Octet Nonet |
Provenance: | This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legals |
Appears in Collections: | Research Theses |
Files in This Item:
File | Description | Size | Format | |
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Kordov2022_PhD.pdf | 1.62 MB | Adobe PDF | View/Open |
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