Type of Document	Dissertation
Author	Chen, Shifeng
URN	etd-03162006-133210
Title	First measurement of deeply virtual compton scattering with polarized proton target
Degree	PhD
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	jefferson lab CLAS general parton distributions target spin asymmetry deeply virtual compton scattering
Date of Defense	2006-02-28
Availability	unrestricted
Abstract 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.
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