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arXiv 2108.12993hep-phhep-ex
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$D_{s0}(2590)$作为具有小$D^*K$组分的主导$c\bar{s}$状态

$D_{s0}(2590)$ as a dominant $c\bar{s}$ state with a small $D^*K$ component

Jia-Ming Xie, Ming-Zhu Liu, Li-Sheng Geng

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13 pages, 1 figure
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摘要：

LHCb合作组最近发现的$D_{s0}(2590)$态被认为是$^1S_{0}$粲奇异介子的第一激发态。然而，它的质量比Godfrey-Isgur夸克模型预测的低约80 MeV。在这项工作中，我们考虑到$D^{\ast}K$的贡献裸$c\bar{s}$状态，并表明，耦合通道相互作用引起的88 MeV的位移相对于传统的夸克模型$c\bar{s}$状态，这是更接近实验质量。我们的研究表明，除了$S$波，$P$波耦合通道相互作用也发挥作用的强子位于接近两个强子阈值。我们进一步研究了非猝灭夸克模型的结果与模型无关的方法。结果表明，二体$D^*K$的衰变宽度与$D^*K$组分的重量成正比.为了用$D^*K$部分衰变宽度饱和实验总衰变宽度，我们需要大约60%的权重，而为了再现未淬灭夸克模型的结果，我们需要大约5%的权重。因此，我们鼓励未来的实验研究的二体$D^*K$部分衰变的$D_{s0}(2590)$。

英文摘要：

The recently discovered $D_{s0}(2590)$ state by the LHCb collaboration was regarded as the first excited state of $^1S_{0}$ charmed-strange meson. Its mass is, however, lower than the Godfrey-Isgur quark model prediction by about 80 MeV. In this work, we take into account the $D^{\ast}K$ contribution to the bare $c\bar{s}$ state, and show that the coupled-channel interaction induces an 88 MeV shift with respect to the conventional quark model $c\bar{s}$ state, which is much closer to the experimental mass. Our study shows that in addition to $S$-wave, $P$-wave coupled-channel interactions also play a role for hadrons located close to two-hadron thresholds. We further scrutinize the unquenched quark model results with a model independent approach. It is shown that the two-body $D^*K$ decay width is proportional to the weight of the $D^*K$ component. To saturate the experimental total decay width with the $D^*K$ partial decay width we need a weight of about 60\% while to reproduce the unquenched quark model result a weight of about 5\% is needed. Therefore, we encourage future experimental studies on the two-body $D^*K$ partial decay of $D_{s0}(2590)$.

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