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Title: Selected nucleon form factors and a composite scalar diquark

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 {approx}20% to the magnitude of g{sub A}. The calculation of the nucleon {sigma} term elucidates the only unambiguous means of extrapolating meson-nucleon couplings off the meson mass shell. (c) 2000 The American Physical Society.

Authors:
 [1];  [1];  [1]
  1. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
20216935
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; NUCLEONS; FORM FACTORS; QUARK MODEL; COMPOSITE MODELS; THEORETICAL DATA

Citation Formats

Bloch, J. C. R., Roberts, C. D., and Schmidt, S. M. Selected nucleon form factors and a composite scalar diquark. United States: N. p., 2000. Web. doi:10.1103/PhysRevC.61.065207.
Bloch, J. C. R., Roberts, C. D., & Schmidt, S. M. Selected nucleon form factors and a composite scalar diquark. United States. doi:10.1103/PhysRevC.61.065207.
Bloch, J. C. R., Roberts, C. D., and Schmidt, S. M. Thu . "Selected nucleon form factors and a composite scalar diquark". United States. doi:10.1103/PhysRevC.61.065207.
@article{osti_20216935,
title = {Selected nucleon form factors and a composite scalar diquark},
author = {Bloch, J. C. R. and Roberts, C. D. and Schmidt, S. M.},
abstractNote = {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 {approx}20% to the magnitude of g{sub A}. The calculation of the nucleon {sigma} term elucidates the only unambiguous means of extrapolating meson-nucleon couplings off the meson mass shell. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevC.61.065207},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 61,
place = {United States},
year = {2000},
month = {6}
}