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dc.contributor.advisorHorsley, Roger
dc.contributor.advisorPendleton, Brian
dc.contributor.authorCooke, Ashley Noel
dc.date.accessioned2014-11-17T15:49:50Z
dc.date.available2014-11-17T15:49:50Z
dc.date.issued2014-11-27
dc.identifier.urihttp://hdl.handle.net/1842/9647
dc.description.abstractWe present a calculation of vector and axial-vector form factors for each of the octet hyperon semi-leptonic transition matrix elements by using the techniques of lattice QCD where simulations were performed with Nf = 2 + 1 flavours of dynamical O(a)-improved Wilson fermions. We also study the electromagnetic form factors, axial charges and other properties of octet baryons. Errors due to extrapolation to zero transferred momentum are reduced by applying a twist to the boundary conditions on the lattice. Our form factor results compare favourably with experiment and other lattice QCD determinations. By considering an expansion about the SU(3)-flavour symmetric limit we seek to investigate and quantify the symmetry breaking effects in these matrix elements due to the mass splitting between the strange and light quarks. We find good agreement with the Ademollo-Gatto theorem for the vector form factor, a measurable amount of breaking in the axial-vector form factor and significant effects in the weak magnetism form factor. Knowledge of the parameterisation of SU(3)-flavour symmetry breaking allows for a series of constrained fits to be made to the form factor results which are used to arrive at a 'baryonic' estimation of the Cabibbo-Kobayashi-Maskawa matrix element |Vus|.en_US
dc.contributor.sponsorSTRONGneten_US
dc.language.isoenen_US
dc.publisherThe University of Edinburghen_US
dc.relation.hasversionA. N. Cooke et al. The effects of flavour symmetry breaking on hadron matrix elements. PoS, LATTICE2012:116, 2012. [arXiv:1212.2564 [heplat]].en_US
dc.relation.hasversionA. N. Cooke et al. SU(3) Flavour breaking and baryon structure. PoS, LATTICE2013:278, 2013. [arXiv:1311.4916 [hep-lat]].en_US
dc.subjectQCDen_US
dc.subjectlatticeen_US
dc.subjectCKMen_US
dc.subjectform factoren_US
dc.subjectmatrix elementsen_US
dc.subjectflavour symmetryen_US
dc.titleLattice QCD study of octet hyperon semi-leptonic decaysen_US
dc.typeThesis or Dissertationen_US
dc.type.qualificationlevelDoctoralen_US
dc.type.qualificationnamePhD Doctor of Philosophyen_US


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