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Study of Double Spin Asymmetries in Inclusive ep Scattering at Jefferson Lab
제퍼슨 연구소에서의 포괄적 전자-양성자 산란을 이용한 이중 스핀 비대칭성 연구

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Authors
강호영
Advisor
최선호
Issue Date
2014-08
Publisher
서울대학교 대학원
Keywords
Double Spin Asymmetry, Proton Spin Structure, Operator Product Expansion, Nucleon Resonance, Electron-Proton Scattering, Jefferson Lab
Description
학위논문(박사)--서울대학교 대학원 :자연과학대학 물리·천문학부,2014. 8. 최선호.
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 A_para and A_perp. 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. Twist-3 matrix element d_2 was calculated using our asymmetry fits evaluated at Q^2 = 1.9 GeV^2. d_2 = -0.0087 +- 0.0014 was obtained by integrating 0.47 <= x <= 0.87.
Language
eng
URI
http://dcollection.snu.ac.kr:80/jsp/common/DcLoOrgPer.jsp?sItemId=000000021424
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College of Natural Sciences (자연과학대학)Dept. of Physics and Astronomy (물리·천문학부)Physics (물리학전공)Theses (Ph.D. / Sc.D._물리학전공)
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