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arXiv 2103.07871hep-ph
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耦合通道模型中$Z_{c}$结构的奇异伙伴

The strange partner of the $Z_{c}$ structures in a coupled-channels model

Pablo G. Ortega, David R. Entem, F. Fernandez

摘要:

在接近$D^-_s D^{*0}/D^{*-}_sD^0$阈值的$K^+$反冲质谱中发现了一种新的带电结构,被称为$Z_{cs}(3985)^-$,这加强了强子结构超越原始$qqq$和$q\bar q$结构的想法。这种态的存在,夸克含量$c\bar c s\bar u$,可以从SU(3)味对称性的公认的$Z_c(3900)^\pm$和$Z_c(4020)$态中预期。的$Z_c$结构已被解释使用手征组分夸克模型在耦合通道计算,在这项工作中,我们进行研究的$Z_{cs}(3985)^-$使用相同的模型。我们能够重现的$K^+$反冲质谱没有任何微调的模型参数。通过对S矩阵解析结构的研究,我们可以得出结论,S矩阵的解析结构是由于存在一个虚极点而产生的。第二种状态,$Z_c(4020)$的SU(3)味伴侣,预测为$\sim\!\! 4110$ MeV/ $c^2$。还预测了隐底奇异扇区中的新状态。

英文摘要:

The discovery of a new charged structure in the $K^+$ recoil-mass spectrum near the $D^-_s D^{*0}/D^{*-}_sD^0$ threshold, dubbed $Z_{cs}(3985)^-$, reinforce the idea that the structure of hadrons goes beyond the naive $qqq$ and the $q\bar q$ structures. The existence of this state, with quark content $c\bar c s\bar u$, can be expected from the well-established $Z_c(3900)^\pm$ and $Z_c(4020)$ states using SU(3) flavor symmetry. The $Z_c$ structures have been explained using the chiral constituent quark model in a coupled-channels calculation and, in this work, we undertake the study of the $Z_{cs}(3985)^-$ using the same model. We are able to reproduce the $K^+$ recoil-mass spectrum without any fine tuning of the model parameters. The study of the analytical structure of the S-matrix allows us to conclude that the structure is due to the presence of one virtual pole. A second state, the SU(3) flavor partner of the $Z_c(4020)$ is predicted at $\sim\!\! 4110$ MeV/$c^2$. New states in the hidden bottom strange sector are also predicted.

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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