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arXiv 0902.3320hep-phhep-ex
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eta' -> eta pi0 pi0衰变中的标量介子

Scalar mesons in eta' -> eta pi0 pi0 decay

S. V. Donskov, A. K. Likhoded, A. V. Luchinsky, V. D. Samoylenko

摘要:

在等压线模型框架下研究了衰变$η'\toηπ^{0}π^{0}$.计算结果表明,如果考虑$a_0$ -和$σ$ -介子的贡献,计算结果与实验符合得很好. $a_0$ -介子的贡献占主导地位,但$σ$ -介子是再现实验Dalitz图形式所必需的。我们用$ππ$ -振幅的参数化代替了通常的Breit-Wigner形式的$σ$ -介子传播子,它满足分析性、交叉性、么正性和手征性的约束.这个振幅在复平面上有一个极点,对应于$σ$介子,描述了$K_{e4}$衰变中$ππ$散射的实验数据。

英文摘要:

The decay $η'\toηπ^{0}π^{0}$ is studied in the framework of isobar model. It is shown, that good agreement with the experiment is achieved if $a_0$- and $σ$-meson contributions are taken into account. The contribution of $a_0$-meson is dominant, but $σ$-meson is necessary to reproduce the form of experimental Dalitz plot. Instead of usual Breit-Wigner form of $σ$-meson propagator we use parametrization of $ππ$-amplitude, that satisfies analiticity, crossing, unitarity and chirality constraints. This amplitude has a pole in complex plane, that corresponds to $σ$-meson and describe experimental data on $ππ$-scattering in $K_{e4}$ decay.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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