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arXiv 2209.01103hep-phhep-ex
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PDMATHAAC中$D^*_{s0}(2317)$和$D_{s1}(2460)$的产生衰变为$D^{(*)}K$和$D^{(*)}_sη$分子

Production of $D^*_{s0}(2317)$ and $D_{s1}(2460)$ in $B$ decays as $D^{(*)}K$ and $D^{(*)}_sη$ molecules

Ming-Zhu Liu, Xi-Zhe Ling, Li-Sheng Geng, En-Wang, Ju-Jun Xie

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17 pages, 4 figures; to appear in Physical Review D
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摘要：

$D_{s0}^{\ast}(2317)$和$D_{s1}(2460)$的分子性质已经从它们的质量、衰变性质和产生速率的角度进行了广泛的研究。在本工作中，我们利用三角图研究了$B \to \bar{D}^{(\ast)}D_{s0}^{*}(2317)$和$B \to \bar{D}^{(\ast)}D_{s1}(2460)$的弱衰变，其中$B$介子首先弱衰变为$\bar{D}^{(\ast)}D_{s}^{(\ast)}$和$J/ψK$（$η_{c}K$），然后通过$η$和$D^{(\ast)}$介子交换，由$D_{s}^{(\ast)}η$和$D^{(\ast)}K$的末态相互作用动态生成$D_{s0}^{\ast}(2317)$和$D_{s1}(2460)$.得到的绝对分支分数的Br $[B \to \bar{D}^{(\ast)}D_{s0}^{*}(2317)]$是在合理的协议与实验数据，而分支分数的Br $[B \to \bar{D}^{(\ast)}D_{s1}(2460)]$是小于实验中心值的几乎2至3倍。我们暂时将这种差异归因于本工作中缺少的反应机制或可能存在的相对较大的$D_{s1}(2460)$波函数中的$c\bar{s}$成分。

英文摘要：

The molecular nature of $D_{s0}^{\ast}(2317)$ and $D_{s1}(2460)$ have been extensively studied from the perspective of their masses, decay properties, and production rates. In this work, we study the weak decays of $B \to \bar{D}^{(\ast)}D_{s0}^{*}(2317)$ and $B \to \bar{D}^{(\ast)}D_{s1}(2460)$ by invoking triangle diagrams where the $B$ meson first decays weakly into $\bar{D}^{(\ast)}D_{s}^{(\ast)}$ and $J/ψK$($η_{c}K$), and then the $D_{s0}^{\ast}(2317)$ and $D_{s1}(2460)$ are dynamically generated by the final-state interactions of $D_{s}^{(\ast)}η$ and $D^{(\ast)}K$ via exchanges of $η$ and $D^{(\ast)}$ mesons. The obtained absolute branching fractions of Br$[B \to \bar{D}^{(\ast)}D_{s0}^{*}(2317)]$ are in reasonable agreement with the experimental data, while the branching fractions of Br$[B \to \bar{D}^{(\ast)}D_{s1}(2460)]$ are smaller than the experimental central values by almost a factor of two to three. We tentatively attribute such a discrepancy to either reaction mechanisms missing in the present work or the likely existence of a relatively larger $c\bar{s}$ component in the $D_{s1}(2460)$ wave function.

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