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arXiv 2008.00111nucl-thhep-ph
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$K(1460)$共振的三体模型

Three-body model for $K(1460)$ resonance

I. Filikhin, R. Ya. Kezerashvili, V. M. Suslov, Sh. M. Tsiklauri, B. Vlahovic

摘要:

基于位形空间中的Faddeev方程,建立了用于$K(1460)$共振的三体$KK\bar K$模型。考虑到中性和带电K介子的质量差异,采用单道方法。它表明,分裂的$K(1460)$共振的质量发生在1460 MeV左右根据$K^0K^0{\bar K}^0$,$K^0K^+K^-$和$K^+K^0{\bar K}^0$,$ K^+K^+K^-$中性和带电粒子配置,分别。计算进行了两套$KK$和$K\bar K$唯象势,后者的相互作用被认为是相同的同位旋单重态和三重态。研究了$KK$相互作用的斥力对$KK\bar K$体系质量的影响,并对质量极化的影响进行了评价。首次考虑了库仑相互作用对$K(1460)$共振的描述。考虑到库仑力,在$K$(1460)共振中的质量分裂被评估为在10 MeV的范围内。考虑了具有$K\bar K$势的三体模型,该势具有由获得准束缚三体态的条件所关联的不同的同位旋单重态和三重态部分的强度。我们的结果与$K(1460)$共振的实验质量相当一致。

英文摘要:

The three-body $KK\bar K$ model for the $K(1460)$ resonance is developed on the basis of the Faddeev equations in configuration space. A single-channel approach is using with taking into account the difference of masses of neutral and charged kaons. It is demonstrated that a splitting the mass of the $K(1460)$ resonance takes a place around 1460 MeV according to $K^0K^0{\bar K}^0$, $K^0K^+K^-$ and $K^+K^0{\bar K}^0$, $ K^+K^+K^-$ neutral and charged particle configurations, respectively. The calculations are performed with two sets of $KK$ and $K\bar K$ phenomenological potentials, where the latter interaction is considered the same for the isospin singlet and triplet states. The effect of repulsion of the $KK$ interaction on the mass of the $KK\bar K$ system is studied and the effect of the mass polarization is evaluated. The first time the Coulomb interaction for description of the $K(1460)$ resonance is considered. The mass splitting in the $K$(1460) resonances is evaluated to be in range of 10 MeV with taking into account the Coulomb force. The three-body model with the $K\bar K$ potential, which has the different strength of the isospin singlet and triplet parts that are related by the condition of obtaining a quasi-bound three-body state is also considered. Our results are in reasonable agreement with the experimental mass of the $K(1460)$ resonance.

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