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Type: Conference paper
Title: What we know and what we don't know about the origin of the spin of the proton
Author: Thomas, A.
Casey, A.
Matevosyan, H.
Citation: International Journal of Modern Physics A, 2010 / vol.25, iss.22, pp.4149-4162
Publisher: World Scientific Publ Co Pte Ltd
Issue Date: 2010
ISSN: 0217-751X
Abstract: The origin of the spin of the proton is one of the most fundamental questions in modern hadron physics. Although tremendous progress has been made since the discovery of the "spin crisis" brought the issue to the fore, much remains to be understood. We carefully review what is known and, especially in the case of lattice QCD, what is not known. We also explain the importance of QCD inspired models in providing a physical picture of proton structure and the connection between those models and what is measured experimentally and on the lattice. We specifically apply these ideas to the issue of quark orbital angular momentum in the proton. We show that the Myhrer-Thomas resolution of the proton spin crisis is remarkably consistent with modern information from lattice QCD.
Keywords: Proton spin; quark spin and orbital angular momentum; gluon angular momentum; quark models; lattice QCD; chiral symmetry
Rights: Copyright © 2010 World Scientific Publishing Co.
RMID: 0020100916
DOI: 10.1142/S0217751X10050470
Appears in Collections:Physics publications

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