Year: 2002
Type: article
Abstract: Poincar\'e covariant Faddeev equations for the nucleon and $\ensuremath{\Delta}$ are solved to illustrate that an internally consistent description in terms of confined-quark and non-point-like confined-diquark correlations can be obtained. $\ensuremath{\pi}N$-loop induced self-energy corrections to the nucleon's mass are analyzed and shown to be independent of whether a pseudoscalar or pseudovector coupling is used. Phenomenological constraints suggest that this self-energy correction reduces the nucleon's mass by up to several hundred MeV. That effect does not qualitatively alter the picture, suggested by the Faddeev equation, that baryons are quark-diquark composites. However, neglecting the $\ensuremath{\pi}$ loops leads to a quantitative overestimate of the nucleon's axial-vector diquark component.
Source: Physical Review C
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2024390990