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Title Study of Double Spin Asymmetries in Inclusive ep Scattering at Jefferson Lab
Abstract The spin structure of the proton has been investigated in the high Bjorken x and low momentum transfer Q^2 region. We used Jefferson Lab's polarized electron beam, a polarized target, and a spectrometer to get both the parallel and perpendicular spin asymmetries Apar and Aperp. These asymmetries produced the physics asymmetries A_1 and A_2 and spin structure functions g_1 and g_2. We found Q^2 dependences of the asymmetries at resonance region and higher-twist effects. Our result increases the available data on the proton spin structure, especially at resonance region with low Q^2. Moreover, A_2 and g_2 data show clear Q^2 evolution, comparing with RSS and SANE-BETA. Negative resonance in A_2 data needs to be examined by theory. It can be an indication of very negative transverse-longitudinal interference contribution at W ~ 1.3 GeV. Higher twist effect appears at the low Q^2 of 1.9 GeV^2, although it is less significant than lower Q^2 data of RSS. Twist03 matrix element d_2 was calcu
Author(s) Hoyoung Kang
Publication Date August 2014
Document Type Thesis
Primary Institution Seoul National University
Affiliation Exp Nuclear Physics / Experimental Halls / Hall C
Funding Source
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-14-2001 OSTI Number: 1190863
LANL Number: Other Number: DOE/OR/23177-3456
Associated with an experiment Yes
Experiment Number(s)
E07-003
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Thesis
Thesis Type PhD
Advisor Institution
1. Seonho Choi Seoul National University
Attachments/Datasets/DOI Link
Document(s)
Dataset(s) (none)
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