1994/03/20 by A. Blotz, Michał Praszałowicz, M. Praszalowicz +1 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.53.485
published as Phys.Rev. D53 (1996) 485-503 · 60 pages, (Bochum report No. RUB-TPII-41/93)
arxiv created 1994/03/20 · openalex publication_date 1996/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Expectation values of the axial-vector currents are calculated within the semibosonized SU(3)-NJL model in the next to leading order of a 1/Nc expansion. These 1/Nc corrections are shown to come from two distinctive sources: (1) the anomalous part of the Euclidean effective action related to the Wess-Zumino term of the SU(3) Skyrme model and (2) the real, nonanomalous part which in this order of 1/Nc has no counterpart within any local effective meson theory. The appearance of the type (2) terms is due to the time ordering of the collective operators entering the formulas for the axial-vector constants. They substantially improve the phenomenology of the model. The question of regularization of these quantities is discussed. The analytic symmetry-breaking terms in the strange quark mass play a minor role for gA(3) and gA(0). They are, however, important for gA(8). Finally, the numerical values for the gA's, gA(0)=0.37, gA(3)=1.38, and gA(8)=0.31, reproduce reasonably well the recent data from lepton scattering (gA(0)=0.31, gA(3)=1.26, and gA(8)=0.35). \textcopyright 1995 The American Physical Society.