Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/100878
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Type: Journal article
Title: Spin of the proton in chiral effective field theory
Author: Li, H.
Wang, P.
Leinweber, D.
Thomas, A.
Citation: Physical Review C, 2016; 93(4):045203-1-045203-6
Publisher: American Physical Society
Issue Date: 2016
ISSN: 2469-9985
2469-9993
Statement of
Responsibility: 
Hongna Li, P. Wang, D.B. Leinweber, and A.W. Thomas
Abstract: Proton spin is investigated in chiral effective field theory through an examination of the singlet axial charge, a 0 , and the two nonsinglet axial charges, a 3 and a 8 . Finite-range regularization is considered as it provides an effective model for estimating the role of disconnected sea-quark loop contributions to baryon observables. Baryon octet and decuplet intermediate states are included to enrich the spin and flavor structure of the nucleon, redistributing spin under the constraints of chiral symmetry. In this context, the proton spin puzzle is well understood with the calculation describing all three of the axial charges reasonably well. The strange quark contribution to the proton spin is negative with magnitude 0.01. With appropriate Q 2 evolution, we find the singlet axial charge at the experimental scale to be ˆ a 0 = 0 . 31 + 0 . 04 − 0 . 05 , consistent with the range of current experimental values
Rights: © 2016 American Physical Society
RMID: 0030046917
DOI: 10.1103/PhysRevC.93.045203
Grant ID: http://purl.org/au-research/grants/arc/DP140103067
http://purl.org/au-research/grants/arc/DP150103164
http://purl.org/au-research/grants/arc/FL0992247
http://purl.org/au-research/grants/arc/DP150103101
Appears in Collections:Physics publications

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