期刊
PHYSICS LETTERS B
卷 759, 期 -, 页码 178-183出版社
ELSEVIER
DOI: 10.1016/j.physletb.2016.05.065
关键词
Baryon octet; Electromagnetic form factors
资金
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-06CH11357]
- Australian Research Council through the ARC Centre of Excellence in Particle Physics at the Terascale, an ARC Australian Laureate Fellowship [FL0992247, DP151103101]
- Japanese Ministry of Education, Sports, Science and Technology [25400270]
Electromagnetic form factors of the baryon octet are studied using a Nambu-Jona-Lasinio model which utilizes the proper-time regularization scheme to simulate aspects of colour confinement. In addition, the model also incorporates corrections to the dressed quarks from vector meson correlations in the t-channel and the pion cloud. Comparison with recent chiral extrapolations of lattice QCD results shows a remarkable level of consistency. For the charge radii we find the surprising result that r(E)(p) < r(E)(Sigma+) and vertical bar r(E)(n)vertical bar < vertical bar r(E)(Xi 0)vertical bar, whereas the magnetic radii have a pattern largely consistent with a naive expectation based on the dressed quark masses. (C) 2016 The Author(s). Published by Elsevier B.V.
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