Constituent Quark Couplings and QCD in the Large Nc Limit
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 the axial vector coupling gA requires a subtraction constant. This fact explains the discrepancy between the results of different recent estimates of the 1/Nc corrections to Weinberg's large Nc result gA=1, where Nc is the number of QCD colors. We also discuss a possible scenario which shows that gA=1 might not be a necessary consequence of QCD in the large Nc limit.
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