Selected nucleon form factors and a composite scalar diquark

Details Selected nucleon form factors and a composite scalar diquark Selected nucleon form factors and a composite scalar diquark

1999-11-22

arxiv.org/abs/nucl-th/9911068v1

Phys.Rev.C61:065207,2000

Physics

Nuclear Physics

Nuclear Theory

12 pages, REVTEX, 5 figures, epsfig

Scientific paper

10.1103/PhysRevC.61.065207

A covariant, composite scalar diquark, Fadde'ev amplitude model for the nucleon is used to calculate pseudoscalar, isoscalar- and isovector-vector, axial-vector and scalar nucleon form factors. The last yields the nucleon sigma-term and on-shell sigma-nucleon coupling. The calculated form factors are soft, and the couplings are generally in good agreement with experiment and other determinations. Elements in the dressed-quark-axial-vector vertex that are not constrained by the Ward-Takahashi identity contribute ~20% to the magnitude of g_A. The calculation of the nucleon sigma-term elucidates the only unambiguous means of extrapolating meson-nucleon couplings off the meson mass-shell.

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