Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/100942
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Type: Journal article
Title: Pure sea-quark contributions to the magnetic form factors of Σ baryons
Other Titles: Pure Pure sea-quark contributions to the magnetic form factors of Sigma baryons
Author: Wang, P.
Leinweber, D.
Thomas, A.
Citation: Physical Review D - Particles, Fields, Gravitation, and Cosmology, 2015; 92(3):034508-1-034508-6
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1550-2368
1550-2368
Statement of
Responsibility: 
P. Wang, D. B. Leinweber, and A. W. Thomas
Abstract: We propose the pure sea-quark contributions to the magnetic form factors of Σ baryons, GuΣ− and GdΣ+, as priority observables for the examination of sea-quark contributions to baryon structure, both in present lattice QCD simulations and possible future experimental measurement. GuΣ−, the u-quark contribution to the magnetic form factor of Σ−, and GdΣ+, the d-quark contribution to the magnetic form factor of Σ+, are similar to the strange-quark contribution to the magnetic form factor of the nucleon, but promise to be larger by an order of magnitude. We explore the size of this quantity within chiral effective field theory, including both octet and decuplet intermediate states. The finite range regularization approach is applied to deal with ultraviolet divergences. Drawing on an established connection between quenched and full QCD, this approach makes it possible to predict the sea-quark contribution to the magnetic form factor purely from the meson loop. In the familiar convention where the quark charge is set to unity GuΣ−=GdΣ+. We find a value of −0.38+0.16−0.17 μN, which is about seven times larger than the strange magnetic moment of the nucleon found in the same approach. Including quark charge factors, the u-quark contribution to the Σ− magnetic moment exceeds the strange-quark contribution to the nucleon magnetic moment by a factor of 14.
Rights: © 2015 American Physical Society
RMID: 0030034914
DOI: 10.1103/PhysRevD.92.034508
Grant ID: http://purl.org/au-research/grants/arc/FL0992247
http://purl.org/au-research/grants/arc/DP140103067
http://purl.org/au-research/grants/arc/DP150103164
Appears in Collections:Physics publications

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