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arXiv 0802.0455hep-ph
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$f_0(980)$和$a_0(980)$中的介子环辐射衰变为$ρ$、$ω$

Meson loops in the $f_0(980)$ and $a_0(980)$ radiative decays into $ρ$, $ω$

H. Nagahiro, L. Roca, E. Oset

摘要:

考虑到这些标量共振态的动力学性质,在手征么正方法的范围内,我们计算了$a_0(980)$和$f_0(980)$标量介子到$ργ$和$ωγ$的辐射衰变宽度.标量介子的辐射宽度的评估的主要成分是从衰变到其组成的赝标-赝标分量和随后的光子辐射的环。发现环中只有赝标介子的主导图是收敛的,而环中有矢量介子的主导图的发散则用易于正则化的两个介子环函数表示。我们提供了所有可能的电荷通道的结果,并获得结果,与不确定性,这与夸克环模型和矢量介子主导的一些版本显着不同。

英文摘要:

We calculate the radiative decay widths of the $a_0(980)$ and $f_0(980)$ scalar mesons into $ργ$ and $ωγ$ considering the dynamically generated nature of these scalar resonances within the realm of the Chiral Unitary Approach. The main ingredient in the evaluation of the radiative width of the scalar mesons are the loops coming from the decay into their constituent pseudoscalar-pseudoscalar components and the subsequent radiation of the photon. The dominant diagrams with only pseudoscalar mesons in the loops are found to be convergent while the divergence of those with a vector meson in the loop are written in terms of the two meson loop function easily regularizable. We provide results for all the possible charge channels and obtain results, with uncertainties, which differ significantly from quark loops models and some version of vector meson dominance.

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