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

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

2003-09-11

arxiv.org/abs/hep-ph/0309118v1

Nuclear Physics A 728 (2003) 425-438; Phys.Atom.Nucl. 67 (2004) 1529-1535; Yad.Fiz. 67 (2004) 1552-1557

Physics

High Energy Physics

High Energy Physics - Phenomenology

REVTeX,10 pages, 11 figures, accepted for publication in Nuclear Physics A

Scientific paper

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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