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Stollenwerk, F.; Hanhart, C.; Kupsc, A.; Meißner, U.-G.; Wirzba, A.
Physics letters. B, 01/2012, Letnik: 707, Številka: 1Journal Article
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 ππ 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 η→π+π−γ and η′→π+π−γ.
