Broken flavour-symmetry induced state mixing in lattice QCD+QED

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dc.contributor.advisorYoung, Ross
dc.contributor.advisorZanotti, James
dc.contributor.authorKordov, Zeno Rafael
dc.contributor.schoolSchool of Physical Sciencesen
dc.date.issued2022
dc.description.abstractLattice 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.en
dc.description.dissertationThesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2022en
dc.identifier.urihttps://hdl.handle.net/2440/135884
dc.language.isoenen
dc.provenanceThis 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/legalsen
dc.subjectHadron spectroscopyen
dc.subjectLattice QCDen
dc.subjectState mixingen
dc.subjectMesonen
dc.subjectBaryonen
dc.subjectFlavour symmetryen
dc.subjectIsospin breakingen
dc.subjectQCD+QEDen
dc.subjectOperator renormalizationen
dc.subjectPseudoscalaren
dc.subjectOcteten
dc.subjectNoneten
dc.titleBroken flavour-symmetry induced state mixing in lattice QCD+QEDen
dc.typeThesisen

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