
TY  - JOUR
A1  - Christos, GA 
T1  - Some Aspects of the U(1) Problem and the Pseudoscalar Mass Spectrum
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1984
VL  - 37
IS  - 3
SP  - 241
EP  - 254
KW  - 
UR  - https://doi.org/10.1071/PH840241 
N2  - A complete discussion of the nonet pseudoscalar mass spectrum and related topics is given. The U(l) problern is briefly reviewed and the large-N point of view is considered. The necessity for a vector ghost gluonic particle, in order to resolve the U(l) problem, is stressed. Scalar ghosts and the Kogut-Susskind mechanism are shown to be insufficient. An analysis of the 1]-1]' mixing problem, with and without PCAC corrections, is made and it is suggested that the singlet decay constant may be nearly twice as large as the other octet decay constants. A general discussion of PCAC corrections is given and the remaining pseudoscalars are considered. As byproducts quark mass values are given and the rnq dependence of <ijq) is elucidated. In the usual scheme, it is found that (8S) ~ 1·48(uu). The 1] ~ tttttt decays are also discussed. 
ER  -

