Analysis of the nature of the $φ\toγπη$ and $φ\toγπ^0π^0$ decays

Details Analysis of the nature of the $φ\toγπη$ and $φ\toγπ^0π^0$ decays Analysis of the nature of the $φ\toγπη$ and $φ\toγπ^0π^0$ decays

2001-01-03

arxiv.org/abs/hep-ph/0101024v2

Phys.Atom.Nucl.65:1528-1536,2002; Yad.Fiz.65:1566-1574,2002; Phys.Rev.D63:094007,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 7 figures, title is changed, a few clarifying remarks are added, accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.63.094007

We study interference patterns in the $\phi\to(\gamma a_0+\pi^0\rho)\to\gamma\pi\eta$ and $\phi\to(\gamma f_0+\pi^0\rho)\to\gamma \pi^0\pi^0$ reactions. Taking into account the interference, we fit the experimental data and show that the background reaction does not distort the $\pi^0\eta$ spectrum in the decay $\phi\to\gamma\pi\eta$ everywhere over the energy region and does not distort the $\pi^0\pi^0$ spectrum in the decay $\phi\to\gamma\pi^0\pi^0$ in the wide region of the $\pi^0\pi^0$ system invariant mass, $m_{\pi\pi}>670$ MeV, or when the photon energy is less than 300 MeV. We discuss the details of the scalar meson production in the radiative decays and note that there are reasonable arguments in favor of the one-loop mechanism $\phi\to K^+K^-\to\gamma a_0$ and $\phi\to K^+K^-\to\gamma f_0$. We discuss also distinctions between the four-quark, molecular, and two-quark models and argue that the Novosibirsk data give evidence in favor of the four-quark nature of the scalar $a_0(980)$ and $f_0(980)$ mesons.

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