Journal
PHYSICAL REVIEW C
Volume 61, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.61.065207
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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 similar to 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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