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| Measurements of the Neutron Longitudinal Spin Asymmetry A1 and Flavor Decomposition in the Valence Quark Region | |
| Flay;David | |
| 出版年 | 2014 |
| 学位授予单位 | Temple University Libraries |
| 英文摘要 | Physics Ph.D. The current data for the nucleon-virtual photon longitudinal spin asymmetry A1 on the proton and neutron have shown that the ratio of the polarized-to-unpolarized down-quark parton distribution functions, Δ d/d, tends towards -1/2 at large x, in disagreement with the perturbative QCD prediction that Δ d/d approaches 1 but more in line with constituent quark models. As a part of experiment E06-014 in Hall A of Jefferson Lab, double-spin asymmetries were measured in the scattering of a longitudinally polarized electron beam of energies 4.74 and 5.89 GeV from a longitudinally and transversely polarized 3He target in the deep inelastic scattering and resonance region, allowing for the extraction of the neutron asymmetry A1n and the ratios Δ d/d and Δ u/u. We will discuss our analysis of the data and present results for A1 and g1/F1 on both 3He and the neutron, and the resulting quark ratios for the up and down quarks in the kinematic range of 0.2 2 2 for our deep inelastic scattering data. Invoking duality, we also extract A1n and g1n/F1n in the resonance region, characterized by 0.6 2 2. Our measurements are compared to the world data and various theoretical models and more recent predictions using the Dyson-Schwinger Equation approach. We also present analysis of the unpolarized cross section data, which contributes to the g1 spin structure function and eventually the a2 matrix element, an x2-weighted moment of g1. The extracted a2 data are compared to a Lattice QCD calculation. Temple University--Theses |
| 英文关键词 | Nuclear physics Particle physics |
| 语种 | 英语 |
| URL | http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/286478 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/248548 |
| 推荐引用方式 GB/T 7714 | Flay;David. Measurements of the Neutron Longitudinal Spin Asymmetry A1 and Flavor Decomposition in the Valence Quark Region[D]. Temple University Libraries,2014. |
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