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|Title:||Charge Symmetry Violation in the Extraction of Strangeness Form Factors of the Nucleon|
|Author:||Alkathiri, Ali Abdullah M.|
|School/Discipline:||School of Physical Sciences : Physics|
|Abstract:||The strange quark contributions to the electromagnetic form factors of the proton are ideal quantities to study the role of hidden avour in the properties of the proton. This has motivated intense experimental measurements of these form factors. A major remaining source of systematic uncertainty in these determinations is the assumption that charge symmetry violation (CSV) is negligible. In this analysis, recent theoretical determinations of the CSV form factors are used and the available parity-violating electron scattering (PVES) data, up to Q2 ~ 1GeV2, are reanalysed. This analysis considers systematic expansions of the strangeness electric and magnetic form factors of the proton. The results provide an update to the determination of strangeness over a range of Q2 where, under certain assumptions about the effective axial form factor, an emergence of non-zero strangeness is revealed in the vicinity of Q2 ~ 0:6 GeV2. Given the recent theoretical calculations, it is apparent that the current limits on the CSV do not have a significant impact on the interpretation of the measurements and hence suggests an opportunity for a next generation of parity-violating measurements to more precisely map the distribution of strange quarks. The size of the Z box correction is particularly significant to the Standard Model (SM) test by the Qweak Experiment. The uncertainties that arise from the underlying γZ interference structure functions can be constrained by phenomenological models such as the Adelaide-Jefferson Lab-Manitoba (AJM) model. Recently, a new lattice method was proposed to compute the structure functions directly from a lattice calculation of the electromagnetic Compton amplitude T(1)(γγ) This method paves the way for a possible extension that involves studying the γZ interference Compton amplitude T₁(γZ) at low Q(2). The question about the required accuracy of T₁(γZ) 1 on the lattice to improve the phenomenological models was studied.|
|Advisor:||Young, Ross D.|
Zanotti, James M.
|Dissertation Note:||Thesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2019|
|Keywords:||Strange quark charge symmetry violation|
strange magnetic moment
strange charge reading
|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|
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