Vector meson dominance, chiral loops, sigma meson, and omega-rho mixing in omega ->pi(0)pi(0)gamma decay
PHYSICAL REVIEW D, cilt.67, sa.7, 2003 (SCI-Expanded)
- 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)
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Çanakkale Onsekiz Mart Üniversitesi Adresli: Hayır
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.