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arXiv 2008.01631hep-phhep-exnucl-th
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动力学双夸克模型中$c\bar c c\bar c$态的简单谱

The Simple Spectrum of $c\bar c c\bar c$ States in the Dynamical Diquark Model

Jesse F. Giron, Richard F. Lebed

摘要:

在动力学双夸克模型下,我们研究了$c\bar c c\bar c$和其它重子四夸克态的光谱。在模型的最小形式中(例如,每个双夸克只出现在颜色三重态组合中;非轨道自旋耦合只连接每个双夸克中的夸克),光谱学非常简单。也就是说,$S$波多重态精确地包含3个简并态($0^{++}$,$1^{+-}$,$2^{++}$),当张量耦合可以忽略时,这7个$P$波态满足等间距规则.当数值比较最近的LHCb的结果,我们发现最好的解释是分配$X(6900)$的$2S$多重峰,而较低的状态建议在约$6740$ MeV适合与成员的$1P$多重峰。我们还预测了其他多重峰($1S$,$1D$等)的位置。并讨论$cc$开放味阈值的意义。

英文摘要:

We develop the spectroscopy of $c\bar c c\bar c$ and other all-heavy tetraquark states in the dynamical diquark model. In the most minimal form of the model (e.g., each diquark appears only in the color-triplet combination; the non-orbital spin couplings connect only quarks within each diquark), the spectroscopy is extremely simple. Namely, the $S$-wave multiplets contain precisely 3 degenerate states ($0^{++}$, $1^{+-}$, $2^{++}$) and the 7 $P$-wave states satisfy an equal-spacing rule when the tensor coupling is negligible. When comparing numerically to the recent LHCb results, we find the best interpretation is assigning $X(6900)$ to the $2S$ multiplet, while a lower state suggested at about $6740$ MeV fits well with the members of the $1P$ multiplet. We also predict the location of other multiplets ($1S$, $1D$, etc.) and discuss the significance of the $cc$ open-flavor threshold.

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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