Vector meson dominance, chiral loops, sigma meson, and omega-rho mixing in omega ->pi(0)pi(0)gamma decay

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Gokalp A., Kucukarslan A., Yilmaz O.

PHYSICAL REVIEW D, cilt.67, sa.7, 2003 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 67 Sayı: 7
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1103/physrevd.67.073008
  • Dergi Adı: PHYSICAL REVIEW D
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

In an attempt to explain the latest experimental result about the branching ratio of omega-->pi(0)pi(0)gamma decay, we reexamine the mechanism of this decay in a phenomenological framework in which the contributions of vector meson dominance, chiral loops, sigma-meson intermediate state amplitudes, and the effects of omega-rho mixing are considered. We conclude that in order to obtain the experimental value of the branching ratio B(omega-->pi(0)pi(0)gamma) the sigma-meson amplitude, which makes a substantial contribution, should be included in the reaction mechanism and the effects of omega-rho mixing should be taken into account. We also estimate the coupling constant g(omegasigmagamma) as g(omegasigmagamma)=0.11, which is much smaller than the values suggested by light cone QCD sum rule calculations.