Type of Document Dissertation Author Chen, Shifeng URN etd-03162006-133210 Title First Measurement of Deeply Virtual Compton Scattering with Polarized Proton Target Degree Doctor of Philosophy Department Physics, Department of Advisory Committee
Advisor Name Title Alexander Ostrovidov Committee Member Larry Dennis Committee Member Paul Eugenio Committee Member Simon Capstick Committee Member Steve Bellenot Committee Member Todd Adams Committee Member Keywords
- Deeply Virtual Compton Scattering
- Jefferson Lab
- General Parton Distributions
- Target Spin Asymmetry
Date of Defense 2006-02-28 Availability unrestricted AbstractTarget 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.
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