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arXiv 1906.09002hep-ph
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$B_{s1}(5778)$作为Bethe-Salpeter方程方法中的$B^*\bar{K}$分子

$B_{s1}(5778)$ as a $B^*\bar{K}$ molecule in the Bethe-Salpeter equation approach

Zhen-Yang Wang, Jing-Juan Qi, Qi-Xin Yu, Xin-Heng Guo

摘要:

在Bethe-Salpeter方程方法中,我们将$B_{s1}(5778)$解释为$S$波$B^\ast\bar{K}$分子态。在梯形近似和瞬时近似下,在核中包含单粒子交换图,并在顶点引入三种不同的形状因子(双极、偶极和指数形状因子),我们发现存在束缚态.我们还研究了衰变$B_{s1}(5778)\rightarrow B_s^\astπ$和辐射衰变$B_{s1}(5778)\rightarrow B_sγ$和$B_{s1}(5778)\rightarrow B_s^{\ast}γ$的衰变宽度,这将对以后的实验具有指导意义。

英文摘要:

We interpret the $B_{s1}(5778)$ as an $S$-wave $B^\ast\bar{K}$ molecular state in the Bethe-Salpeter equation approach. In the ladder and instantaneous approximations, and with the kernel containing one-particle-exchange diagrams and introducing three different form factors (monopole, dipole, and exponential form factors) in the vertex, we find the bound state exists. We also study the decay widths of the decay $B_{s1}(5778)\rightarrow B_s^\astπ$ and the radiative decays $B_{s1}(5778)\rightarrow B_sγ$ and $B_{s1}(5778)\rightarrow B_s^{\ast}γ$, which will be instructive for the forthcoming experiments.

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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