The axial anomaly and the conversion of gluons into photons
Abstract
The axial anomaly in the divergence of the singlet axial current in QCD + QED leads to low-energy theorems for the matrix element of this operator equation over vacuum and two--photon states and for the matrix element over vacuum and two--gluon states. The solution of these theorems is related only to the nonperturbative phenomena. These matrix elements are calculated in instanton vacuum generated N-JL type quark model for arbitrary Nf . It is shown that this model does satisfy the low-energy theorems.
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