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Analysis of the nature of the phi ---> gamma pi eta and phi ---> gamma pi0 pi0 decays

Jan, 2001
14 pages
Published in:
  • Phys.Atom.Nucl. 65 (2002) 1528-1536,
  • Yad.Fiz. 65 (2002) 1566-1574,
  • Phys.Rev.D 63 (2001) 094007
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Abstract:
We study interference patterns in the ϕ→(γa0+π0ρ)→γπη\phi\to(\gamma a_0+\pi^0\rho)\to\gamma\pi\eta and ϕ→(γf0+π0ρ)→γπ0π0\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 π0η\pi^0\eta spectrum in the decay ϕ→γπη\phi\to\gamma\pi\eta everywhere over the energy region and does not distort the π0π0\pi^0\pi^0 spectrum in the decay ϕ→γπ0π0\phi\to\gamma\pi^0\pi^0 in the wide region of the π0π0\pi^0\pi^0 system invariant mass, mππ>670m_{\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 ϕ→K+K−→γa0\phi\to K^+K^-\to\gamma a_0 and ϕ→K+K−→γf0\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 a0(980)a_0(980) and f0(980)f_0(980) mesons.
Note:
  • 15 pages, 7 figures, title is changed, a few clarifying remarks are added, accepted for publication in Physical Review D Journal-ref: Phys. Rev. D, 63 (2001) 094007
  • 12.39.-x
  • 13.65.+i
  • 13.40.Hq
  • Phi(1020): radiative decay
  • Phi(1020): hadronic decay
  • pseudoscalar meson: pair production
  • pi0
  • eta
  • scalar meson: intermediate state
  • a0(980)
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