Constituent quark couplings and QCD in the large N<inf>c</inf> limit

Santiago Peris, Eduardo de Rafael

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21 Citations (Scopus)


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 colours. We also discuss a possible scenario which shows that gA = 1 might not be a necessary consequence of QCD in the large Nc limit. © 1993.
Original languageEnglish
Pages (from-to)389-393
JournalPhysics Letters B
Publication statusPublished - 15 Jul 1993


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