Radiative decays of ϕ-meson and nature of light scalar resonances

Abstract

Based on gauge invariance, we show that the new threshold phenomenon is discovered in the ϕradiative decays ϕ\toγa0\toγ\pi0ηand ϕ\toγf0\toγ\pi0\pi0. 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.

12 pages, 5 figures, revtex

References in corpus (10)

• Scalar mesons above and below 1 GeV
• Study of the Decay phi --> pi0 pi0 gamma with the KLOE Detector
• Study of the Decay phi --> eta pi0 gamma with the KLOE detector
• Hadronic D Decays Involving Scalar Mesons
• Analysis of the nature of the $\varphi \to \gamma \pi \eta$ and $\varphi \to \gamma {\pi }^0{\pi }^0$ decays
• Analysis of the nature of the $\varphi \to \gamma \pi \eta$ and $\varphi \to \gamma {\pi }^0{\pi }^0$ decays
• The new analysis of the KLOE data on the phi->eta pi0 gamma decay
• Finite width effects in ϕradiative decays
• Search for $a_0(980)$ and $f_0(980)$ mesons in $\varphi \to \gamma K\bar{K}$
• Analysis of nature of phi -> gamma pi0 eta and phi -> gamma pi0 pi0 decays

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