Abstract We recall the predictions made ten years ago about a bound state of J P = 0 + in I = 0 of the D ⁎ K ¯ ⁎ system, which is manifestly exotic, and we associate it to the X 0 ( 2866 ) state reported in the recent LHCb experiment. Fine tuning the parameters to reproduce exactly the mass and width of the X 0 ( 2866 ) state, we report two more states stemming from the same interaction, one with 1 + and the other with 2 + . For reasons of parity, the 1 + state cannot be observed in D K ¯ decay, and we suggest to observe it in the D ⁎ K ¯ spectrum. On the other hand, the 2 + state can be observed in D K ¯ decay but the present experiment has too small statistics in the region of its mass to make any claim. We note that measurements of the D ⁎ K ¯ spectrum and of the D K ¯ with more statistics should bring important information concerning the nature of the X 0 ( 2866 ) and related ones that could be observed.

中文翻译：

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X0(2866) 作为 D⁎K¯⁎ J = 0+ 状态和相关的 1+,2+ 状态的分子图

摘要 我们回忆十年前对 D ⁎ K ¯ ⁎ 系统的 I = 0 中 JP = 0 + 束缚态的预测，这显然是奇异的，我们将其与 X 0 (2866) 状态相关联最近的 LHCb 实验。微调参数以精确再现 X 0 (2866) 状态的质量和宽度，我们报告了源自相同相互作用的另外两种状态，一种具有 1 + ，另一种具有 2 + 。由于奇偶性的原因，在 DK ¯ 衰变中无法观察到 1 + 状态，我们建议在 D ⁎ K ¯ 光谱中观察它。另一方面，可以在 DK 衰变中观察到 2+ 态，但本实验在其质量区域的统计数据太少，无法做出任何声明。