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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2112.08038hep-ph
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耦合通道模型中的$Z_{cs}(3985)^-$结构

The $Z_{cs}(3985)^-$ structure in a coupled-channels model

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

摘要:

重夸克偶素谱中$Z_c(3900)^\pm$和$Z_b(10610)^\pm$结构的发现表明,需要在夸克模型中加入除原始$qqq$和$q\bar q$系统之外的强子结构。新的带电结构称为$Z_{cs}(3985)^-$,在接近$D^-_s D^{*0}/D^{*-}_sD^0$阈值的$K^+$反冲质谱中发现,是这条线的新证据。在这项工作中,我们分析了$Z_{cs}(3985)^-$状态,以下的$Z_c$和$Z_b$状态的计算使用手征组分夸克模型的耦合通道计算,所有的参数约束从以前的计算。S-矩阵的极点结构显示了两个低于$D_s^-D^{*\,0}$和$D_s^{*\,-}D^{*\,0}$阈值的虚拟极点,与$Z_{cs}(3985)^\pm$和一个新的预测的$Z_{cs}(4110)^\pm$结构($Z_c(4020)^\pm$的SU(3)味伙伴)兼容。的$K^+$反冲质谱计算与LHCb和BESIII实验数据吻合良好,没有微调的模型参数。我们的结果表明,$Z_{cs}(3985)^\pm$和$Z_{cs}(4000)^\pm$信号来自同一个虚态。

英文摘要:

The discovery of the $Z_c(3900)^\pm$ and $Z_b(10610)^\pm$ structures in the heavy quarkonium spectrum showed the need to incorporate hadron structures beyond the naive $qqq$ and $q\bar q$ systems in quark models. The new charged structure called $Z_{cs}(3985)^-$, spotted in the $K^+$ recoil-mass spectrum close to the $D^-_s D^{*0}/D^{*-}_sD^0$ threshold, is a new evidence in this line. In this work, we analyze the $Z_{cs}(3985)^-$ state, following the calculation of the $Z_c$ and $Z_b$ states using a chiral constituent quark model in a coupled-channels calculation, with all the parameters constrained from previous calculations. The pole structure of the S-matrix shows two virtual poles below the $D_s^-D^{*\,0}$ and $D_s^{*\,-}D^{*\,0}$ thresholds compatible with the $Z_{cs}(3985)^\pm$ and a new predicted $Z_{cs}(4110)^\pm$ structure, the SU(3) flavor partner of the $Z_c(4020)^\pm$. The $K^+$ recoil-mass spectrum is calculated in good agreement with LHCb and BESIII experimental data, with no fine tuning of the model parameters. Our results indicate that the $Z_{cs}(3985)^\pm$ and $Z_{cs}(4000)^\pm$ signals originate from the same virtual state.

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