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arXiv · hep-ph/0309118

Radiative decays of phi-meson about nature of light scalar resonances

N. N. Achasov
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Abstract

We show on gauge invariance grounds that the fine threshold phenomenon is discovered in the radiative decays phi->gamma a0->gamma pi0 eta and phi->gamma f0->gamma pi0pi0. This enables to conclude that production of the lightest scalar mesons a0(980) and f0(980) in these decays is caused by the four-quark transitions, resulting in strong restrictions on the large NC expansions of the decay amplitudes. The analysis shows that these constraints give new evidences in favor of the four-quark nature of a0(980) and f0(980) mesons.

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N. N. Achasov. 2003-09-11. Radiative decays of phi-meson about nature of light scalar resonances. https://doi.org/10.1134/1.1788044

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