Model-independent approach to eta -> pi+ pi- gamma and eta' -> pi+ pi- gamma

Details Model-independent approach to eta -> pi+ pi- gamma and eta' -> pi+ pi- gamma Model-independent approach to eta -> pi+ pi- gamma and eta' -> pi+ pi- gamma

2011-08-11

arxiv.org/abs/1108.2419v3

Phys.Lett.B707:184-190,2012

Physics

Nuclear Physics

Nuclear Theory

16 pages, 4 figures

Scientific paper

10.1016/j.physletb.2011.12.008

We present a new, model-independent method to analyze radiative decays of mesons to a vector, isovector pair of pions of invariant mass square below the first significant pion-pion threshold in the vector channel. It is based on a combination of chiral perturbation theory and dispersion theory. This allows for a controlled inclusion of resonance physics without the necessity to involve vector meson dominance explicitly. As an example, the method is applied to an analysis of the reactions eta -> pi+ pi- gamma and eta'->pi+ pi- gamma.

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