dorsal/arxiv
View SchemaSelected nucleon form factors and a composite scalar diquark
| Authors | J. C. R. Bloch, C. D. Roberts, S. M. Schmidt |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9911068 |
| URL | https://arxiv.org/abs/nucl-th/9911068 |
| DOI | 10.1103/PhysRevC.61.065207 |
| Journal | Phys.Rev.C61:065207,2000 |
Abstract
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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"abstract": "A covariant, composite scalar diquark, Fadde\u0027ev amplitude model for the\nnucleon is used to calculate pseudoscalar, isoscalar- and isovector-vector,\naxial-vector and scalar nucleon form factors. The last yields the nucleon\nsigma-term and on-shell sigma-nucleon coupling. The calculated form factors are\nsoft, and the couplings are generally in good agreement with experiment and\nother determinations. Elements in the dressed-quark-axial-vector vertex that\nare not constrained by the Ward-Takahashi identity contribute ~20% to the\nmagnitude of g_A. The calculation of the nucleon sigma-term elucidates the only\nunambiguous means of extrapolating meson-nucleon couplings off the meson\nmass-shell.",
"arxiv_id": "nucl-th/9911068",
"authors": [
"J. C. R. Bloch",
"C. D. Roberts",
"S. M. Schmidt"
],
"categories": [
"nucl-th",
"hep-lat",
"hep-ph",
"nucl-ex"
],
"doi": "10.1103/PhysRevC.61.065207",
"journal_ref": "Phys.Rev.C61:065207,2000",
"title": "Selected nucleon form factors and a composite scalar diquark",
"url": "https://arxiv.org/abs/nucl-th/9911068"
},
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