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Makins, Naomi C.R. Bailey, Paul Spencer 2012-06-27T20:03:07Z 2012-06-27T20:03:07Z 10000-01-01 2006 This dissertation presents the results of an investigation into the contribution to the spin of the nucleon from the gluons mediating the strong force within the nucleon. The experimental data was obtained using the HERMES instrument at the Deustches Elektronen-Synchroton (DESY) in Hamburg, Germany during the year 2000. The effort was motivated by an earlier observation at HERMES that not all of the spin could be attributed to the quarks making up the nucleon The approach utilized in the work reported herein was to employ the polarized gas target at HERMES to provide a polarized target of nucleons and then to probe the attendant polarization of the gluons with the polarized positron beam of the experiment. This was accomplished by seeking evidence of photon-gluon fusion (PGF) deep inelastic scattering events in the form of elementary particles resulting from the decay of charmed particles, which were known to be unique indicators of PGF. Best results indicate ΔG/G = 0.131± 0.164 (stat.) ± 0.131(syst.) at xg = 0.35 and Q2 = 0.18, a result consistent with zero or a slightly positive value. Submitted by Megan O'Donnell (mnodonn2@illinois.edu) on 2012-06-27T20:03:07Z No. of bitstreams: 1 Bailey_Paul.pdf: 5313145 bytes, checksum: c009b15e7cccd124f3ddad5198a84577 (MD5) Made available in DSpace on 2012-06-27T20:03:07Z (GMT). No. of bitstreams: 1 Bailey_Paul.pdf: 5313145 bytes, checksum: c009b15e7cccd124f3ddad5198a84577 (MD5) Previous issue date: 2006 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Megan O'Donnell (mnodonn2@illinois.edu) on 2012-06-27T20:03:07Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:33:06-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: dissertation/thesis dissertation/thesis U of I Only 5384553 http://hdl.handle.net/2142/31908 en © 2006 Paul Spencer Bailey gluons HERMES photon-gluon fusion (PGF) Bose-Einstein condensates Monte Carlo Simulation (MCS) A measurement of the contribution of the gluon to the spin of the nucleon Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.