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arXiv 1906.09010hep-ph
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具有重夸克自旋对称性的隐魅奇异分子重子态的预言

Prediction of hidden charm strange molecular baryon states with heavy quark spin symmetry

C. W. Xiao, J. Nieves, E. Oset

摘要:

本文利用耦合道研究了介子-重子$S-$波相互作用在等oscillator隐魅奇异扇区和$J^P = 1/2^-,3/2^-$及$5/2^-$中的情况。我们在相互作用中施加重夸克自旋对称性的约束,并从局部隐规范方法到粲扇的扩展中获得非零矩阵元。紫外发散重整使用相同的介子重子环调节器以前在非奇怪的隐藏的魅力部门,在那里获得了新发现的五夸克态的属性的良好再现。我们得到五个状态的$1/2^-$,四个$3/2^-$和一个$5/2^-$,这可以在不久的将来与即将到来的LHCb实验进行比较。$5/2^-$、三个$3/2^-$和另外三个$1/2^-$共振源自同序$\bar D^{(*)}Ξ_c^\prime$和$\bar D^{(*)}Ξ_c^*$相互作用。它们的位置应该比相应的阈值(4446、4513、4588和4655 MeV)低几MeV,并且是先前发现的同位旋1/2 $\bar D^{(*)} Σ_c^{(*)}$准束缚态的SU(3)-兄弟,这为$P_c(4440)$、$P_c(4457)$和$P_c(4312)$ LHCb奇异态提供了一个可靠的理论描述。在这项工作中获得的另外两个$1/2^-$和$3/2^-$状态是$\bar D^{(*)}Ξ_c-D^{(*)}_sΛ_c$耦合通道等序相互作用的结果,明显比其他更宽,宽度为15 MeV的数量级,是$\bar D^{(*)}_sΛ_c$占主导地位的衰变通道。

英文摘要:

We have studied the meson-baryon $S-$wave interaction, using coupled channels, in the isoscalar hidden-charm strange sector and $J^P = 1/2^-,3/2^-$ and $5/2^-$. We impose constraints of heavy quark spin symmetry in the interaction and obtain the non vanishing matrix elements from an extension of the local hidden gauge approach to the charm sector. The ultraviolet divergences are renormalized using the same meson-baryon-loops regulator previously employed in the non-strange hidden charm sector, where a good reproduction of the properties of the newly discovered pentaquark states is obtained. We obtain five states of $1/2^-$, four of $3/2^-$ and one of $5/2^-$, which could be compared in the near future with forthcoming LHCb experiments. The $5/2^-$, three of the $3/2^-$ and another three of the $1/2^-$ resonances are originated from isoscalar $\bar D^{(*)}Ξ_c^\prime$ and $\bar D^{(*)}Ξ_c^*$ interactions. They should be located just few MeV below the corresponding thresholds (4446, 4513, 4588 and 4655 MeV), and would be SU(3)-siblings of the isospin 1/2 $\bar D^{(*)} Σ_c^{(*)}$ quasi-bound states previously found, and that provided a robust theoretical description of the $P_c(4440)$, $P_c(4457)$ and $P_c(4312)$ LHCb exotic states. The another two $1/2^-$ and $3/2^-$ states obtained in this work are result of the $\bar D^{(*)}Ξ_c-D^{(*)}_sΛ_c$ coupled-channels isoscalar interaction, are significantly broader than the others, with widths of the order of 15 MeV, being $\bar D^{(*)}_sΛ_c$ the dominant decay channel.

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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