Type of Document	Dissertation
Author	Stokes, Burnham Edward
Author's Email Address	bestokes@jlab.org
URN	etd-09192006-171254
Title	Search for Resonances in the Photoproduction of Proton-Antiproton Pairs
Degree	PhD
Department	Physics, Department of
Advisory Committee	Advisor Name Title Paul Eugenio Committee Chair Alexander Ostrovidov Committee Member Dennis Weygand Committee Member Gregory Riccardi Committee Member Jorge Piekarewicz Committee Member Larry Dennis Committee Member Todd Adams Committee Member
Keywords	proton antiproton pbar anti-p photoproduction reso
Date of Defense	2006-07-15
Availability	unrestricted
Abstract Results are reported on the reaction gamma p -> p p anti-p with beam energy in the range 4.8-5.5 GeV. The data were collected at the Thomas Jefferson National Accelerator Facility in CLAS experiment E01-017(G6C). The focus of this study is an understanding of the mechanisms of photoproduction of proton-antiproton pairs, and to search for intermediate resonances, both narrow and broad, which decay to p anti-p. The total measured cross section in the photon energy range 4.8-5.5 GeV is sigma = 33 +/- 2 nb. Measurement of the cross section as a function of energy is provided. An upper limit on the production of a narrow resonance state previously observed with a mass of 2.02 GeV/c^2 is placed at 0.35 nb. No intermediate resonance states were observed. Meson exchange production appears to dominate the production of the proton-antiproton pairs.
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