标题： ρ和ω衰变到π0π0γ中的σ介子效应 显示英文标题

标题： Scalar sigma meson effects in rho and omega decays into pi0 pi0 gamma

摘要： 利用Chiral微扰理论与线性σ模型在标量道中的互补性，研究了$\pi^0\pi^0$在$\rho$和$\omega$辐射衰变中的产生，其中低质量标量共振态$\sigma(500)$的效应应该显现出来。 最近报道的$\rho\to\pi^0\pi^0\gamma$数据似乎需要一个低质量和适度宽度的$\sigma(500)$的贡献。 通过提高这些测量的精度，可以确定这个有争议状态的性质。 数据也可以纳入我们的框架中，但对 $\omega\to\pi^0\pi^0\gamma$ 特性敏感得多，而对 $\sigma(500)$ 特性却不那么敏感。 显示英文摘要

摘要： The complementarity between Chiral Perturbation Theory and the Linear Sigma Model in the scalar channel is exploited to study $\pi^0\pi^0$ production in $\rho$ and $\omega$ radiative decays, where the effects of a low mass scalar resonance $\sigma(500)$ should manifest. The recently reported data on $\rho\to\pi^0\pi^0\gamma$ seem to require the contribution of a low mass and moderately narrow $\sigma(500)$. The properties of this controversial state could be fixed by improving the accuracy of these measurements. Data on $\omega\to\pi^0\pi^0\gamma$ can also be accommodated in our framework, but are much less sensitive to the $\sigma(500)$ properties.