Heavy quark spin multiplet structure of Pc-like pentaquarks as a P-wave hadronic molecular state
Heavy quark spin multiplet structure of Pc-like pentaquarks as a P-wave hadronic molecular state
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DOI：
10.1093/ptep/ptz146
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发表时间：
2019-01
影响因子：
3.5
通讯作者：
Y. Shimizu;Y. Yamaguchi;M. Harada
中科院分区：
文献类型：
--
作者：
Y. Shimizu;Y. Yamaguchi;M. Harada
将P波$Q\bar{Q}qqq$型五夸克态作为一个重介子和一个重子的分子，研究了其重夸克自旋多重态结构.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两部分。引入LCS的基础上，我们发现HQS多重峰分类的LCS：五个HQS单峰，两个HQS双峰，和三个HQS三重峰。我们构建了一个介子交换势尊重重夸克自旋和手征对称性，以证明HQS多重态实现为束缚态。通过求解耦合道薛定谔方程，我们研究了重介子-重子系统，$I=1/2$，$J^P=（1/2^+，3/2^+，5/2^+，7/2^+）$.具有相同LCS结构的束缚态在重夸克极限处是简并的，并在有限质量下解决了简并问题。这种HQS多重峰结构将在未来的实验中测量。
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 wave function into 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 Schrödinger 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 the 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 future experiments.