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arXiv 2603.09830hep-ph
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重双重子 $Ξ^{(*)}_{cc}Ξ^{(*)}_{cc}$ 和 $Ξ^{(*)}_{bb}Ξ^{(*)}_{bb}$

Heavy dibaryons $Ξ^{(*)}_{cc}Ξ^{(*)}_{cc}$ and $Ξ^{(*)}_{bb}Ξ^{(*)}_{bb}$

School of Physical Science and Technology, Southwest University(西南大学物理科学与技术学院)

An-Su Lu, Mao-Jun Yan, Chun-Sheng An, Cheng-Rong Deng

AI总结:

本文研究了双 $Ξ_{cc}$ 和双 $Ξ_{bb}$ 系统的束缚态形成及性质,揭示了介子交换作用在其中的关键作用。

摘要:

我们系统地研究了双重子 $Ξ^{(*)}_{cc}Ξ^{(*)}_{cc}$(双 $Ξ_{cc}$)和 $Ξ^{(*)}_{bb}Ξ^{(*)}_{bb}$(双 $Ξ_{bb}$),在非相对论夸克模型中考虑各种异ospin-自旋配置 $I(J^P)$。对于双 $Ξ_{cc}$ 系统,只有单通道 $Ξ_{cc}Ξ^*_{cc}$ 和 $Ξ^*_{cc}Ξ^*_{cc}$ 与 $0(1^+)$ 能够形成类似氘的束缚态,其中 $σ$ 质子交换起决定性作用。这些状态的束缚能约为 $-1.5$ MeV 和 $-3.3$ MeV,尺寸分别为 2.37 fm 和 1.87 fm。在双 $Ξ_{cc}$ 系统中,$0(1^+)$ 的耦合通道效应增强了吸引力。因此,该双 $Ξ_{cc}$ 系统可以建立类似氘的配置,其相对于阈值 $Ξ_{cc}Ξ_{cc}$ 的束缚能为 $-7.5$ MeV,尺寸约为 1.40 fm。对于双 $Ξ_{bb}$ 系统,$0(1^+)$、$0(2^+)$ 和 $0(3^+)$ 的单通道可以产生类似氘的束缚态,束缚能范围从 $-6.1$ MeV 到 $-14.3$ MeV。此外,双 $Ξ_{bb}$ 系统中 $1(0^+)$ 和 $1(2^+)$ 的通道也可以建立类似氘的束缚态,束缚能约为 $-0.5$ MeV。当考虑双 $Ξ_{bb}$ 系统中 $0(1^+)$ 的耦合通道效应时,会形成紧凑的六夸克态,表现出相对于阈值 $Ξ_{bb}Ξ_{bb}$ 的束缚能为 $-21.2$ MeV,尺寸为 0.53 fm。在该态中,$π$ 质子交换提供了非常强大的吸引力。在夸克模型中,介子交换相互作用在双 $Ξ_{bb}$ 束缚态中是不必要的,除了 $Ξ_{bb}^*Ξ_{bb}^*$ 与 $1(0^+)$ 的情况。

英文摘要:

We systematically investigate the dibaryons $Ξ^{(*)}_{cc}Ξ^{(*)}_{cc}$ (di-$Ξ_{cc}$) and $Ξ^{(*)}_{bb}Ξ^{(*)}_{bb}$ (di-$Ξ_{bb}$), with various isospin-spin configurations $I(J^P)$ in a nonrelativistic quark model. For the di-$Ξ_{cc}$ system, only the single channels $Ξ_{cc}Ξ^*_{cc}$ and $Ξ^*_{cc}Ξ^*_{cc}$ with $0(1^+)$ are capable of forming deuteronlike bound states, with the $σ$ meson exchange playing a decisive role. Those states have binding energies of approximately $-1.5$ MeV and $-3.3$ MeV and sizes of 2.37 fm and 1.87 fm, respectively. The coupled channel effect in the di-$Ξ_{cc}$ system with $0(1^+)$ enhances the attraction. As a result, this di-$Ξ_{cc}$ system can establish a deuteronlike configuration, with the binding energy of $-7.5$ MeV relative to the threshold $Ξ_{cc}Ξ_{cc}$ and the size of approximately 1.40 fm. For the di-$Ξ_{bb}$ system, the single channels with $0(1^+)$, $0(2^+)$, and $0(3^+)$ can give rise to deuteronlike bound states with binding energies ranging from $-6.1$ MeV to $-14.3$ MeV. Additionally, the di-$Ξ_{bb}$ system with $1(0^+)$ and $1(2^+)$ can also establish deuteronlike bound states with binding energies of around $-0.5$ MeV. When considering the coupled channel effect in the di-$Ξ_{bb}$ system with $0(1^+)$, a compact hexaquark state is formed, exhibiting a binding energy of $-21.2$ MeV relative to the threshold $Ξ_{bb}Ξ_{bb}$ and a size of 0.53 fm. In this state, the $π$ meson exchange provides a very powerful attractive force. The meson exchange interactions in the quark model is dispensable in the di-$Ξ_{bb}$ bound states, except for $Ξ_{bb}^*Ξ_{bb}^*$ with $1(0^+)$.

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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