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arXiv 2007.05190hep-phhep-exhep-latnucl-exnucl-th
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手征夸克模型中的$QQ\bar{s}\bar{s}$四夸克

$QQ\bar{s}\bar{s}$ tetraquarks in the chiral quark model

Gang Yang, Jialun Ping, Jorge Segovia

摘要:

在手征夸克模型的复标度范围下,系统地研究了具有$IJ^P=00^+$、$01^+$和$02^+$的低位$S$波$QQ\bar{s}\bar{s}$($Q=c, b$)四夸克态。用高斯展开法,考虑了四体扇形中的各种结构,包括介子-介子、双夸克-反双夸克和K型组态,以及所有可能的色通道。用$IJ^P=00^+$和$02^+$得到了$cc\bar{s}\bar{s}$和$bb\bar{s}\bar{s}$四夸克态的几个窄共振态和宽共振态。同时,在$IJ^P=00^+$,$01^+$和$02^+$态中也发现了$cb\bar{s}\bar{s}$四夸克态的窄共振态.这些结果证实了在非相互作用强子-强子阈值之上发现质量为$\sim\,0.6\,\text{GeV}$的强子分子的可能性。

英文摘要:

The low-lying $S$-wave $QQ\bar{s}\bar{s}$ ($Q=c, b$) tetraquark states with $IJ^P=00^+$, $01^+$ and $02^+$ are systematically investigated in the framework of complex scaling range of chiral quark model. Every structure including meson-meson, diquark-antidiquark and K-type configurations, and all possible color channels in four-body sector are considered by means of a commonly extended variational approach, Gaussian expansion method. Several narrow and wide resonance states are obtained for $cc\bar{s}\bar{s}$ and $bb\bar{s}\bar{s}$ tetraquarks with $IJ^P=00^+$ and $02^+$. Meanwhile, narrow resonances for $cb\bar{s}\bar{s}$ tetraquarks are also found in $IJ^P=00^+$, $01^+$ and $02^+$ states. These results confirm the possibility of finding hadronic molecules with masses $\sim\,0.6\,\text{GeV}$ above the noninteracting hadron-hadron thresholds.

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