Flavor content of nucleon form factors in a VMD approach
Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, AP 70-543, 04510, México DF, Mexico
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Accepted: 18 March 2007
Published online: 21 June 2007
The strange form factors of the nucleon are studied in a two-component model consisting of a three-quark intrinsic structure surrounded by a meson cloud. A comparison with the available experimental world data from the SAMPLE, PVA4, HAPPEX and G0 Collaborations shows a good overall agreement. It is shown that the strangeness contribution to the electric and magnetic form factors is of the order of a few percent. In particular, the strange quark contribution to the charge radius is small 〈r 2 s〉E = 0.005 fm^2 and to the magnetic moment it is positive μs = 0.315 μN .
PACS: 13.40.Gp Electromagnetic form factors – / 12.40.Vv Vector-meson dominance – / 14.20.Dh Protons and neutrons – / 13.40.Em Electric and magnetic moments –
© Società Italiana di Fisica and Springer-Verlag, 2007