Chiral-loop and vector-meson contributions to eta -> pi pi gamma gamma decays
Ll. Ametller, J. Bijnens, A. Bramon, P. Talavera
Abstract
The process eta -> pi0 pi0 gamma gamma is discussed in Chiral Perturbation Theory (ChPT) extending two recent analyses. Special attention is devoted to one-loop corrections, eta-eta' mixing effects and vector-meson dominance of ChPT counter-terms. The less interesting eta -> pi+ pi- gamma gamma transition is briefly discussed too.
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