Current algebra theorems for the U(1) ``Goldstone boson''
Abstract
The U(1) problem is reconsidered from the point of view of the {1}/{N} expansion. It is argued that various heuristic ideas about the η' are valid from this point of view. Current algebra theorems, similar to soft π theorems, are derived for the η'. They are valid to lowest order in {1}/{N}.
 Publication:

Nuclear Physics B
 Pub Date:
 September 1979
 DOI:
 10.1016/05503213(79)900312
 Bibcode:
 1979NuPhB.156..269W