Declaration of Authorship The work described in this thesis was carried out in collaboration with Professor Nick Evans and Tom Waterson. The following list details our original work and gives references for the material. • Chapter 6: Nick Evans, Andrew Tedder and Tom Waterson, JHEP v.01 2007, p.058, arXiv:hep-ph/0603249 • Chapter 7: Nick Evans and Andrew Tedder, Phys. Lett. B642 2006, p.546-550, arXiv:hep-ph/0609112 • Chapter 8: Nick Evans and Andrew Tedder, 2007, arXiv:0711.0300 (hep-ph), accepted for publication in Physics Review Letters There is also some original work of ours in chapter 4 (the quantitative glueball spectrum, and the m$_{ρ}$ : m 2 π graph) and chapter 5 (the possible effect of gluonic contributions to g$_{5}$ ). However no claims to originality are made for the rest of chapters 4 and 5, and all of chapters 1 to 3, whose content has been complied from a variety of sources. viii