标题： 像$P_c$的五夸克的重夸克自旋多重态结构作为 P 波强子分子态 显示英文标题

标题： Heavy quark spin multiplet structure of $P_c$-like pentaquark as P-wave hadronic molecular state

摘要： 我们研究作为重介子和重重子分子的P波$Q\bar{Q}qqq$型五夸克的重夸克自旋（HQS）多重态结构。我们定义了轻云自旋（LCS）基，将介子-重子自旋波函数分解为LCS和HQS部分。引入LCS基后，我们发现按LCS分类的HQS多重态；五个HQS单态，两个HQS双态和三个HQS三重态。我们构建了一个尊重重夸克自旋和手征对称性的π介子交换势，以证明哪些HQS多重态作为束缚态实现。通过求解耦合通道薛定谔方程，我们研究了具有$I=1/2$和$J^P=(1/2^+, 3/2^+, 5/2^+, 7/2^+)$的重介子-重子系统。具有相同LCS结构的束缚态在重夸克极限下简并，对于有限质量，简并被解除。这种HQS多重态结构将在未来的实验中被测量。 显示英文摘要

摘要： We study the heavy quark spin (HQS) multiplet structure of P-wave $Q\bar{Q}qqq$-type pentaquarks treated as molecules of a heavy meson and a heavy baryon. We define the light-cloud spin (LCS) basis decomposing the meson-baryon spin wavefunction into the LCS and HQS parts. Introducing the LCS basis, we find HQS multiplets classified by the LCS; five HQS singlets, two HQS doublets, and three HQS triplets. We construct the one-pion exchange potential respecting the heavy quark spin and chiral symmetries to demonstrate which HQS multiplets are realized as a bound state. By solving the coupled channel Schr\"odinger equations, we study the heavy meson-baryon systems with $I=1/2$ and $J^P=(1/2^+, 3/2^+, 5/2^+, 7/2^+)$. The bound states which have same LCS structure are degenerate at the heavy quark limit, and the degeneracy is resolved for finite mass. This HQS multiplet structure will be measured in the future experiments.