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Target Spin Asymmetry is first measured in the exclusive Deeply Virtual Compton Scattering (DVCS). The asymmetry is the results of interference between the DVCS and the Bethe-Heitler (BH) process, and gives access to the Generalized Parton Distributions (GPD) H˜ and H. The data were recorded with the CLAS detector at the Thomas Jefferson National Accelerator Facility. Both the electron beam (of energy 5.7 GeV) and the solid NH3 target were longitudinally polarized. Exclusive DVCS events were selected by requiring identifying the scattered electron, recoil proton, and detected photon. Monte-Carlo (MC) simulation is studied to estimate the background from π0 events. The acceptance corrected single photon asymmetry is well described by the function F=p0sinΦ+p1sin2Φ with p0=0.252 ± 0.042(stat) ± 0.020(sys) and p1=-0.022 ± 0.045(stat) ± 0.021(sys). This result agrees rather well with the predictions of a model of GPDs.
Deeply Virtual Compton Scattering, Jefferson Lab, CLAS, General Parton Distributions, Target Spin Asymmetry
Date of Defense
February 28, 2006.
A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Includes bibliographical references.
Paul Eugenio, Professor Directing Dissertation; Steve Bellenot, Outside Committee Member; Todd Adams, Committee Member; Simon Capstick, Committee Member; Larry Dennis, Committee Member; Alexander Ostrovidov, Committee Member.
Florida State University
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