Measurements of the Neutron Longitudinal Spin Asymmetry A1n and Flavor Decomposition in the Valence Quark Region
- Temple University, Philadelphia, PA (United States)
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-quarkparton distribution functions,Dd=d, tends towards -1/2 at large x, in disagreement with the perturbative QCD prediction that Dd/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 An1 and the ratios Dd/d and Du/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
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1182583
- Report Number(s):
- JLAB-PHY--14-1933; DOE/OR/23177--3352
- Country of Publication:
- United States
- Language:
- English
Similar Records
A Preliminary Measurement of the Longitudinal Spin Asymmetry An1*
Precision Measurement of the Neutron $d_{2}$ : A Probe of the Color Force
Measuring the Neutron Spin Asymmetry A1n in the Valence Quark Region in Hall C at Jefferson Lab
Conference
·
Mon Oct 01 00:00:00 EDT 2012
·
OSTI ID:1993503
Precision Measurement of the Neutron $d_{2}$ : A Probe of the Color Force
Conference
·
Mon Oct 01 00:00:00 EDT 2012
·
OSTI ID:1993370
Measuring the Neutron Spin Asymmetry A1n in the Valence Quark Region in Hall C at Jefferson Lab
Thesis/Dissertation
·
Mon May 01 00:00:00 EDT 2023
·
OSTI ID:2396741