Selected nucleon form factors and a composite scalar diquark

1999/11/22 by J. C. R. Bloch, Jacques Bloch, Craig D. Roberts +3 · 4 citations
Physics and Astronomy · #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.61.065207

published as Phys.Rev.C61:065207,2000 · 12 pages, REVTEX, 5 figures, epsfig

arxiv created 1999/11/22 · openalex publication_date 2000/05/22 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 \ensuremathσ term and on-shell \ensuremathσ-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 \ensuremath∼20% to the magnitude of g_A. The calculation of the nucleon \ensuremathσ term elucidates the only unambiguous means of extrapolating meson-nucleon couplings off the meson mass shell.

Citations

• Pseudovector components of the pion,π0→γγ,andFπ(q2)
• J PC -Exotic Mesons from the Bethe-Salpeter Equation
• Inside Mesons: Coupling Constants and Form Factors
• Describinga1andb1decays
• Modeling Nonperturbative QCD for Mesons and Couplings
• Nucleon form factors and a nonpointlike diquark
• Octet and decuplet baryons in a covariant and confining diquark-quark model

Cited by

• K→ππand a light scalar meson
• Nucleon mass and pion loops
• Nucleon and pion distribution functions in the valence region
• Relativistic three-quark bound states in separable two-quark approximation
• Quark tensor charge and electric dipole moment within the Schwinger-Dyson formalism