Doctor of Philosophy (PhD)
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Antibaryon Photoproduction, Antiproton, Proton-Antiproton photoproduction
Date of Defense
Antibaryon production has been investigated since the advent of nuclear
physics, largely motivated by the potential for baryon-antibaryon bound states.
Due to the recent availability of high statistics experiments there has been a
renewed interest in how antibaryons are created in photoproduction. The g12
(E04-005) experiment conducted at Thomas Jefferson National Accelerator Fa-
cility used the CEBAF Large Acceptance Spectrometer to provide the world’s
largest dataset for baryon-antibaryon photoproduction on a liquid hydrogen tar-
get. The focus of this work is to investigate the photoproduction mechanism of
γp → ppp ̄ through detailed differential cross section measurements from 3.95
to 5.45 GeV. These first time results as well as the resulting total cross section
measurement are reported. In particular the energy dependence (σ(Eγ)) and the
angular dependence (dσ/dcos(θCM)) have interesting features that have never p ̄
been seen before. On the other hand, the mass distributions (dσ/dM(pp) and dσ/dM(pp ̄) do not show evidence for previously reported narrow resonances. In addition, the first time total cross section mesurement of an antineutron in photoproduction using the reaction γp → ppn ̄π− is reported. The significance and implications of these results will be discussed as well.
Phelps, William B., "Antibaryon Photoproduction using CLAS at Jefferson Lab" (2017). FIU Electronic Theses and Dissertations. 3507.
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