CONSTITUENT QUARK COUPLINGS AND QCD IN THE LARGE N(C) LIMIT

Citation
S. Peris et E. Derafael, CONSTITUENT QUARK COUPLINGS AND QCD IN THE LARGE N(C) LIMIT, Physics letters. Section B, 309(3-4), 1993, pp. 389-393
Citations number
17
Categorie Soggetti
Physics
Journal title
ISSN journal
03702693
Volume
309
Issue
3-4
Year of publication
1993
Pages
389 - 393
Database
ISI
SICI code
0370-2693(1993)309:3-4<389:CQCAQI>2.0.ZU;2-W
Abstract
It is shown that in the constituent quark model of Georgi-Manohar, the dispersion relation that leads to the Adler-Weisberger sum rule for t he axial vector coupling g(A) requires a subtraction constant. This fa ct explains the discrepancy between the results of different recent es timates of the 1/N(c) corrections to Weinberg's large N(c) result g(A) = 1, where N(c) is the number of QCD colours. We also discuss a possi ble scenario which shows that g(A) = 1 might not be a necessary conseq uence of QCD in the large N(c) limit.