论文标题
紧凑的隐藏魅力pentaquark状态和QCD异构体
Compact hidden charm pentaquark states and QCD isomers
论文作者
论文摘要
我们对Pentaquark说明$ QQQC \ bar {c} $（$ q = u，d $和$ s $）进行了详尽的调查，并在多Quark Color Flux-tube-tube模型中讨论了颜色结构的效果。我们展示了LHCB协作观察到的状态$ p_c $和$ p_c $ $ p_c $的结构和属性的新颖图片。我们可以将状态描述为模型中紧凑型五角夸。 $ p_c（4312）^+$和$ p_c（4337）^+$的旋转 - - $ \ frac {1} {1} {2}^ - 而$ p_c（4380） $ \ frac {3} {2}^ - $。它们的结构分别是五角大楼，diquark，Pentagon，Diquark和Octet。每个组中的成员都可以被类似地称为QCD异构体，因为它们具有相同的自旋 - 含量和夸克含量，但颜色结构不同。 singlet $ p_ {cs}（4459）^0 $具有五角形结构和$ \ frac {1} {2} {2}^ - $的旋转率。此外，我们还预测了模型中的$ p_ {cs} $，$ p_ {c ss} $和$ p_ {csss} $。基于颜色通量管图的五体限制潜力，这是集体的自由度，并诱导QCD异构体现象，在紧凑状态的形成中起着重要作用。
We make an exhaustive investigation on the pentaquark states $qqqc\bar{c}$ ($q=u, d$ and $s$) and discuss the effect of color structures in a multiquark color flux-tube model. We exhibit a novel picture of the structure and properties of the states $P_c$ and $P_{cs}$ observed by the LHCb Collaboration. We can describe the states as the compact pentaquark states in the model. The spin-parity of the group of $P_c(4312)^+$ and $P_c(4337)^+$ is $\frac{1}{2}^-$ while that of the group of $P_c(4380)^+$, $P_c(4440)^+$ and $P_c(4457)^+$ is $\frac{3}{2}^-$. Their structures are pentagon, diquark, pentagon, diquark, and octet, respectively. The members in each group can be analogically called QCD isomers because of their the same spin-parity and quark content but different color structures. The singlet $P_{cs}(4459)^0$ has pentagon structure and spin-parity of $\frac{1}{2}^-$. In addition, we also predict the $P_{cs}$, $P_{c ss}$ and $P_{csss}$ families in the model. The five-body confinement potential based on the color flux-tube picture, which is a collective degree of freedom and induces QCD isomer phenomenon, plays an important role in the formation of the compact states.
