On the extraction of the quark mass ratio (md - mu)/ms from Gamma(eta' -> pi0 pi+ pi-)/Gamma(eta' -> eta pi+ pi-)
Abstract
The claim that the light quark mass ratio (md - mu)/ms can be extracted from the decay width ratio Gamma(eta' -> pi0 pi+ pi-)/Gamma(eta' -> eta pi+ pi-) is critically investigated within a U(3) chiral unitary framework. The influence of the recent VES data on the eta' -> eta pi+ pi- decay is also discussed.
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