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Type: Journal article
Title: Nucleon mass and pion loops
Author: Hecht, M.
Roberts, C.
Oettel, M.
Thomas, A.
Schmidt, S.
Tandy, P.
Citation: Physical Review C, 2002; 65(5):1-17
Publisher: American Physical Soc
Issue Date: 2002
ISSN: 0556-2813
Statement of
M. B. Hecht, C. D. Roberts, M. Oettel, A. W. Thomas, S. M. Schmidt, P. C. Tandy
Abstract: Poincaré covariant Faddeev equations for the nucleon and Δ are solved to illustrate that an internally consistent description in terms of confined-quark and non-point-like confined-diquark correlations can be obtained. πN-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 π loops leads to a quantitative overestimate of the nucleon’s axial-vector diquark component.
Rights: ©2002 American Physical Society
RMID: 0020020656
DOI: 10.1103/PhysRevC.65.055204
Appears in Collections:Special Research Centre for the Subatomic Structure of Matter publications

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