Vector meson dominance, chiral loops, σ meson, and ω-ρ mixing in ω→π0π0γ decay -: art. no. 073008

被引：7

作者：

Gokalp, A ^{[1
]}

Kucukarslan, A ^{[1
]}

Yilmaz, O ^{[1
]}

机构：

[1] Middle E Tech Univ, Dept Phys, TR-06531 Ankara, Turkey

来源：

PHYSICAL REVIEW D | 2003年 / 67卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.67.073008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：6

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