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arXiv 2201.08253hep-ph
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$Z_c(3900)$和$Z_{cs}(3985)$奇异态的联合分析

A combined analysis of the $Z_c(3900)$ and the $Z_{cs}(3985)$ exotic states

Meng-Lin Du, Miguel Albaladejo, Feng-Kun Guo, Juan Nieves

摘要:

我们对$Z_c(3900)$和$Z_{cs}(3985)$结构的BESIII数据进行了综合分析,假设后者是前者的SU(3)味伙伴。我们已经改进了先前的分析Albaladejo $et$ $al.$ [物理快报。B 755,337(2016)],通过计算考虑$D$和$S$ -波$D_1D^*π$耦合的$D_1\bar{D}D^*$三角图的振幅。我们还研究了SU(3)光味违反的影响,发现这是适度的,约为20%。BESIII谱在隐魅区和隐魅奇异区的成功再现,有力地支持了$Z_{cs}(3985)$和$Z_c(3900)$是位于同一个八重态多重态中的SU(3)味伴。最好的结果时,得到的能量依赖项的对角$D^{(*)}\bar D_{(s)}^{(*)}$相互作用,导致共振(极点以上的阈值)来描述这些奇异的状态。我们还分别用$J^{PC}=1^{+-}$和$J^{P}=1^{+}$预测了等载体$Z_{c}^*$和等小分子$Z_{cs}^*$、$D^*\bar{D}^*$和$D^*\bar{D}_{s}^*$分子。这些态将是$Z_{c}$和$Z_{cs}$的重夸克自旋对称伙伴。除了$Z_c(3900)$和$Z_{cs}(3985)$的质量和宽度的测定,我们还预测了$Z_c^*$和$Z_{cs}^*$共振。

英文摘要:

We have performed a combined analysis of the BESIII data for both the $Z_c(3900)$ and $Z_{cs}(3985)$ structures, assuming that the latter is an SU(3) flavor partner of the former one. We have improved on the previous analysis of Albaladejo $et$ $al.$ [Phys. Lett. B 755, 337 (2016)] by computing the amplitude for the $D_1\bar{D}D^*$ triangle diagram considering both $D$ and $S$-wave $D_1D^*π$ couplings. We have also investigated effects from SU(3) light-flavor violations, which are found to be moderate and of the order of 20%. The successful reproduction of the BESIII spectra, in both the hidden-charm and hidden-charm strange sectors, strongly supports that the $Z_{cs}(3985)$ and $Z_c(3900)$ are SU(3) flavor partners placed in the same octet multiplet. The best results are obtained when an energy-dependent term in the diagonal $D^{(*)}\bar D_{(s)}^{(*)}$ interaction is included, leading to resonances (poles above the thresholds) to describe these exotic states. We have also made predictions for the isovector $Z_{c}^*$ and isodoublet $Z_{cs}^*$, $D^*\bar{D}^*$ and $D^*\bar{D}_{s}^*$ molecules, with $J^{PC}=1^{+-}$ and $J^{P}=1^{+}$, respectively. These states would be heavy-quark spin symmetry partners of the $Z_{c}$ and $Z_{cs}$. Besides the determination of the masses and widths of the $Z_c(3900)$ and $Z_{cs}(3985)$, we also predict those of the $Z_c^*$ and $Z_{cs}^*$ resonances.

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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