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IHEP 98 - 16
A.V.Kiselev and V.A.Petrov
Box anomaly and eta' --> pi+ pi- gamma decay
Protvino, 1998.- p.5, tables 2, refs.:15.

In the framework of the "current scheme" of eta -- eta' mixing we calculate the amplitude of the decay eta' --> pi+ pi- gamma in the soft limit and compare our results with recently reported values of the phenomenological additive terms to the rho --meson background.

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