Author:Gluckman, Gary RichardDate:1994Ratios of Laplace QCD sum rules are used in order to determine the on-shell charm- and beauty-quark masses. After confronting the experimental data in the charmonium and bottonium systems with theory, we obtain mc = 1.46 ± 0.07 GeV and mb = ...Read more
Author:Castillo, Hernan; Dominguez, Cesareo A; Loewe, MarceloDate:2005The electromagnetic form factors of the nucleon, in the space-like region, are determined from three-point function Finite Energy QCD Sum Rules. The QCD calculation is performed to leading order in perturbation theory in the chiral limit, and ...Read more
Author:Rozowsky, Joel SolomonDate:1994The electromagnetic form factor of the pion in the space-like region, and at finite temperature, Fπ(Q²,T), is obtained from a Finite Energy QCD Sum Rule. The form factor decreases with increasing T, and vanishes at some critical temperature, ...Read more
Author:Dominguez, Cesareo A; Thapedi, TebohoDate:2004The electromagnetic form factors of the proton are obtained using a particular realization of QCD in the large Nc limit (QCD∞), which sums up the infinite number of zero-width resonances to yield an Euler's Beta function (Dual-QCD∞). The form ...Read more
Author:Ramlakan, AlastairDate:2000The subject of this thesis is the determination of the size of SU(3) flavour symmetry breaking in the QeD vacuum, as measured by the ratio of the strange to non-strange quark vacuum condensates <ss>/<uu> (with <ūu>Read more
Author:Hernandez, Luis AlbertoDate:2016This work consists of two themes. First, we work with Finite Energy QCD Sum Rules (FESR) approach in the vacuum. We tackle the problem of quark-hadron duality violation (DV), using the vector and axial-vector hadronic spectral function from ...Read more
Author:Van Gend, CarelDate:1991Sum rules in QCD are discussed and finite energy and Laplace transform sum rules are used to determine the strange-quark mass. We use improved QCD input and experimental data to obtain for the invariant mass: mₛ= 266 ± 29 MeV, or for the ...Read more
Author:Jonker, JanoDate:1995Octet and decuplet baryon masses are studied at finite temperature in the framework of finite energy QCD sum rules. In all cases it is found that the mass stays fairly constant over a range of temperatures, increasing sharply near the critical ...Read more
Author:Willers, BernardDate:2008The renormalizable Abelian quantum field theory model of Kroll, Lee and Zumino is used to calculate next-to-leading order corrections to the pion electromagnetic form factor in vector meson dominance. At zero temperature the predictions for ...Read more
Author:Fetea, Mirela SimonaDate:1998The temperature corrections to the current algebra Gell-Mann, Oakes and Renner(GMOR) relation in SU(2) X SU(2), the temperature behaviour of the pion mass and the q2 and T dependence of the ρππ vertex function in the space-like region are ...Read more
Author:Moodley, PreshinDate:2017We extend the Kroll-Lee-Zumino model in its particle content to include the charged rho vector mesons and the neutral pion meson. This entailed using the larger SU(2) gauge group. The masses for the vector mesons were generated via spontaneous ...Read more
Author:Lushozi, MawandeDate:2017The Kroll-Lee-Zumino theory, an Abelian renormalizable quantum field theory of charged pions and a neutral ρ meson, provides a framework to compute corrections to the tree-level Vector-Meson-Dominance model. Despite a large ρππ coupling (gρππ ...Read more
Author:Lushozi, MawandeDate:2014The Abelian Kroll-Lee-Zumino theory is a renormalizable quantum field theory of charged pions and neutral rho-mesons. It provides the quantum field theory platform for the vector meson dominance model, allowing for a systematic computation ...Read more