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This discussion explores four-meson radiative processes in chiral perturbation theory, highlighting implications for experimental data.
We present a general discussion of radiative four-meson processes to O(p4) in chiral perturbation theory. We propose a definition of "generalized bremsstrahlung" that takes full advantage of experimental information on the corresponding non-radiative process. We also derive general formulae for one-loop amplitudes which can be applied, for instance, to η→3πγ, ππ→ππγ and K→3πγ.
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G. et al. (1996) studied this question.
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