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Publication Information
Title Precision Measurement of the Neutron Asymmetry An 1 at Large Bjorken x at 12GeV Jefferson Lab
Abstract The virtual photon asymmetry A1 is one of the fundamental quantities that provide information on the spin structure of the nucleon. The value of A1 at high xBj is of particular interest because valence quarks dominate in this region, which makes it a relatively clean region to study the nucleon structure. Several theoretical calculations, including naive SU(6) quark model, relativistic constituent quark model (RCQM), perturbative QCD (pQCD), predict the behavior for A1 and the quark polarization in the high xBj valence quark region. The An 1 experiment during the 6 GeV JLab era showed that An 1 turns positive at x ? 0.5, while up to the highest measured x value of 0.61 the down quark polarization ?d/d remains negative, in contrast to the pQCD prediction. Subsequent theoretical studies following the 6 GeV results claimed that quark orbital angular momentum could delay the upward turn of ?d/d to higher xBj or the non-perturbative nature of the strong interaction could keep it negative
Author(s) Mingyu Chen
Publication Date November 2023
Document Type Thesis
Primary Institution Thomas Jefferson National Accelerator Facility, Newport News
Affiliation Exp Nuclear Physics / Experimental Halls / Hall C
Funding Source Nuclear Physics (NP)
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-23-4012 OSTI Number: 2326020
LANL Number: Other Number: DOE/OR/23177-7428
Associated with an experiment Yes
Experiment Number(s)
E12-06-110
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Thesis
Thesis Type PhD
Advisor Institution
1. Jian-Ping Chen JLAB
2. Xiaochao Zheng UVA
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Document(s)
Dataset(s) (none)
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