Radiative decays of φ-meson and nature of light scalar resonances
نویسنده
چکیده
Based on gauge invariance, we show that the new threshold phenomenon is discovered in the φ radiative decays φ → γa0 → γπη and φ → γf0 → γππ. 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. PACS number(s): 12.39.-x, 13.40.Hq, 13.65.+i Typeset using REVTEX
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