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arXiv 1706.07553hep-ph
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$[cc][\bar{c}\bar{c}]$四夸克态的非相对论模型

A non-relativistic model for the $[cc][\bar{c}\bar{c}]$ tetraquark

V. R. Debastiani, F. S. Navarra

摘要:

我们用非相对论模型研究了由$[cc][\bar{c}\bar{c}]$组成的双夸克-反双夸克组态的四夸克态的光谱。通过数值求解带有Cornell激发势的薛定谔方程,我们将四体问题分解为三个两体问题。用自旋相关项(自旋-自旋、自旋-轨道和张量)描述了$c\bar{c}$谱的分裂结构,并将其推广到双夸克相互作用。最新的实验数据的粲偶素状态被用来固定的模型参数和光谱得到满意的描述。我们发现,自旋相关的相互作用是相当大的双夸克-反双夸克系统,尽管重双夸克质量,也有一个有限的大小,如果以同样的方式处理的$c\bar{c}$系统的双夸克。我们发现,最低的$S$波$T_{4c}$四夸克可能低于它们自发解离成低位粲偶素对的阈值,而轨道和径向激发则大多高于相应的粲偶素对阈值。最后,我们去掉势的限制部分,重复计算,得到了束缚双夸克态和束缚四夸克态。这可能与夸克-胶子等离子体中奇异粲偶素的研究有关。$T_{4c}$状态可以在LHC和Belle II即将进行的实验中进行研究。

英文摘要:

We use a non-relativistic model to study the spectroscopy of a tetraquark composed of $[cc][\bar{c}\bar{c}]$ in a diquark-antidiquark configuration. By numerically solving the Schrödinger equation with a Cornell-inspired potential, we separate the four-body problem into three two-body problems. Spin-dependent terms (spin-spin, spin-orbit and tensor) are used to describe the splitting structure of the $c\bar{c}$ spectrum and are also extended to the interaction between diquarks. Recent experimental data on charmonium states are used to fix the parameters of the model and a satisfactory description of the spectrum is obtained. We find that the spin-dependent interaction is sizable in the diquark-antidiquark system, despite the heavy diquark mass, and also that the diquark has a finite size if treated in the same way as the $c\bar{c}$ systems. We find that the lowest $S$-wave $T_{4c}$ tetraquarks might be below their thresholds of spontaneous dissociation into low-lying charmonium pairs, while orbital and radial excitations would be mostly above the corresponding charmonium pair thresholds. Finally, we repeat the calculations without the confining part of the potential and obtain bound diquarks and bound tetraquarks. This might be relevant to the study of exotic charmonium in the quark-gluon plasma. The $T_{4c}$ states could be investigated in the forthcoming experiments at the LHC and Belle II.

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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