Selected nucleon form factors and a composite scalar diquark

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dc.creatorBloch, J. C. R.
dc.creatorRoberts, C. D.
dc.creatorSchmidt, S. M.
dc.date1999-11-22
dc.date.accessioned2026-07-07T12:29:18Z
dc.date.available2026-07-07T12:29:18Z
dc.descriptionA 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.
dc.description12 pages, REVTEX, 5 figures, epsfig
dc.identifierhttps://arxiv.org/abs/nucl-th/9911068
dc.identifierhttp://arxiv.org/abs/nucl-th/9911068
dc.identifierPhys.Rev.C61:065207,2000
dc.identifierdoi:10.1103/PhysRevC.61.065207
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/215827
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Experiment
dc.titleSelected nucleon form factors and a composite scalar diquark
dc.typetext

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