Prediction of hidden charm strange molecular baryon states with heavy quark spin symmetry
Prediction of hidden charm strange molecular baryon states with heavy quark spin symmetry
复制标题
DOI：
10.1016/j.physletb.2019.135051
复制
发表时间：
2019-06
影响因子：
4.4
通讯作者：
C. Xiao;J. Nieves;E. Oset;E. Oset
中科院分区：
文献类型：
--
作者：
C. Xiao;J. Nieves;E. Oset;E. Oset
本文研究了等oscillator隐魅奇异扇区中介子-重子S-波相互作用，其中J P= 1/2-时，耦合道为η c Λ，J/π Λ，D ′ s Λ c，D ′ s π c′，D ′ s π c π，J/π Λ，D ′ s π c′，D ′ s π c π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。我们得到了5个1/2−态，4个3/2−态和1个5/2−态，在不久的将来可以与即将到来的LHCb实验进行比较。5/2−、三个3/2−共振和另外三个1/2−共振是由等序D <$（）c′和D <$（）c相互作用产生的。它们的位置应该比相应的阈值（4446、4513、4588和4655 MeV）低几MeV，并且应该是先前发现的同位旋1/2 D ′（π）π c（π）准束缚态的SU（3）-兄弟，这为Pc（4440）、Pc（4457）和Pc（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−态是D <$s（<$）<$c-Ds（<$）Λ c耦合通道等oscillatory相互作用的结果，比其他两个态宽得多，宽度为15 MeV，D <$s（<$）Λ c是主要的衰变通道。
We have studied the meson-baryon S− wave interaction in the isoscalar hidden-charm strange sector with the coupled-channels, η c Λ, J/ψ Λ, D¯ Ξ c, D¯ s Λ c, D¯ Ξ c′, D¯⁎ Ξ c, D¯ s⁎ Λ c, D¯⁎ Ξ c′, D¯⁎ Ξ c⁎ in J P= 1/2−, J/ψ Λ, D¯⁎ Ξ c, D¯ s⁎ Λ c, D¯⁎ Ξ c′, D¯ Ξ c⁎, D¯⁎ Ξ c⁎ in 3/2− and D¯⁎ Ξ c⁎ in 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 D¯(⁎) Ξ c′ and 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 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 D¯(⁎) Ξ c− D s (⁎) Λ c coupled-channels isoscalar interaction, are significantly broader than the others, with widths of the order of 15 MeV, being D¯ s (⁎) Λ c the dominant decay channel.