An Analysis of the Hadronic Spectrum from Lattice QCD

Physics – High Energy Physics – High Energy Physics - Lattice

Scientific paper

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151 pages, 43 figures, 17 tables, PhD Thesis

Scientific paper

I begin by discussing the basic ideas of quantum field theory (QFT). I provide a review of symmetries in physics and then move on to discuss the quark model. I then review lattice gauge theory with particular attention paid to lattice QCD and some of the associated problems. I discuss gauge fields on the lattice along with free lattice fermions. I follow this with a definition of the lattice QCD action and discuss how to reproduce the correct continuum physics. I include a discussion of the basic numerical techniques employed in lattice simulations. I review methods for putting particles onto the lattice and describe how to fit the resulting data. The symmetries of the QCD Lagrangian are reviewed along with various forms of symmetry breaking in physics, the PCAC relation, the Goldberger-Treiman relation and the spontaneous breakdown of the axial symmetry. I move on to discuss sigma models and finally arrive at a basic chiral perturbation theory. I present research completed with my supervisor C. Allton and collaborators A.W. Thomas, D.B. Leinweber and R. Young in the final three chapters. This work involves making lattice predictions for the Hadronic mass spectrum using extrapolation techniques based on the predictions of chiral perturbation theory which have been developed by the Adelaide group.

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