Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-07-09
Phys. Rev. D84, 054014 (2011)
Physics
High Energy Physics
High Energy Physics - Phenomenology
Published in PRD. Text modified according to the PRD journal style and format. 28 pages, 15 figures, 8 tables
Scientific paper
10.1103/PhysRevD.84.054014
We study the octet baryon electromagnetic properties by applying the covariant spectator quark model, and provide covariant parametrization that can be used to study baryon electromagnetic reactions. While we use the lattice QCD data in the large pion mass regime (small pion cloud effects) to determine the parameters of the model in the valence quark sector, we use the nucleon physical and octet baryon magnetic moment data to parameterize the pion cloud contributions. The valence quark contributions for the octet baryon electromagnetic form factors are estimated by extrapolating the lattice parametrization in the large pion mass regime to the physical regime. As for the pion cloud contributions, we parameterize them in a covariant, phenomenological manner, combined with SU(3) symmetry. We also discuss the impact of the pion cloud effects on the octet baryon electromagnetic form factors and their radii.
Ramalho G.
Tsushima Kazuo
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