中文摘要：

在手征SU（3）夸克模型和推广SU（3）手征夸克模型下，应用共振群方法研究了奇异数为-5的双重子系统的结构，主要分析了标量介子混合角对系统结合能的影响．结果表明，无论是哪种混合，双重子Θ·Ω都是束缚态．在手征夸克模型下，混合角为-18°和19°时，Θ·Ω系统结合能大致相同；但在理想混合下，因为σ场没有贡献，系统的结合能会大大减少．同时还发现，考虑混合角时的结合能远小于不考虑混合角时的结合能．本文工作对标量介子混合角问题的研究提供了一些有意义的信息．

英文摘要：

In the chiral SU （3） quark model and extended chiral SU （3） quark model, we study the structure of strangeness --5 dibaryon by solving a Resonating Group Method equation. The effects from the mixing of scalar mesons are analyzed in the chiral SU（3） quark model,the binding energies are almost the same for -18°and 19° mixing cases. But the binding energy is reduced quite a lot for ideal mixing case, since there is no contribution from σ meson. Compared with the results of no mixing case,the binding energies are reduced a lot for any ming cases. The present work might be helpful in understanding the question of mixing of scalar mesons.