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On the extraction of the quark mass ratio (m_d - m_u)/m_s from Gamma(eta' -> pi⁰ pi^+ pi^-)/Gamma(eta' -> eta pi^+ pi^-)
classification
✦ hep-ph
hep-exnucl-exnucl-th
keywords
gammaratiodecaymassquarkchiralclaimcritically
read the original abstract
The claim that the light quark mass ratio (m_d - m_u)/m_s can be extracted from the decay width ratio Gamma(eta' -> pi^0 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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Forward citations
Cited by 1 Pith paper
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Study of $\eta^\prime \to \eta \pi\pi $ Decays in Large-$N_C$ Chiral Perturbation Theory
Including ππ final-state interactions in large-Nc ChPT improves agreement with η′ → η ππ data and yields Dalitz parameters a = -0.085(18)stat(4)syst, b = -0.081(10)stat(6)syst, d = -0.045(6)stat(8)syst.
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