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arXiv 1802.01384hep-phhep-exhep-lat
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分子图象中$P_c(4380)$五夸克态的强衰变

Strong Decay of $P_c(4380)$ Pentaquark in a Molecular Picture

K. Azizi, Y. Sarac, H. Sundu

摘要:

对LHCb合作组在$J/ψN $不变质量下新发现的五夸克$P_c(4380)$和$P_c(4450)$的亚结构有不同的假设,给出了与实验观测一致的质量结果.对它们质量的实验数据和最近的理论研究表明,这些态分别被解释为自旋3/2负宇称和自旋5/2正宇称五夸克态。也可能存在对应于这些粒子的相反宇称态。然而,尽管有很多研究,这些五夸克的性质和内部组织在夸克和胶子方面并不清楚。为此,我们需要对这些状态的其他物理性质进行更多的理论研究。在此基础上,我们用三点QCD求和规则方法研究了$P_c(4380)$到$J/ψ$和$N$的强主导衰变.采用分子形式的内插电流计算了正负宇称自旋3/2五夸克态跃迁的六个强耦合形状因子。耦合常数的值用于计算这些跃迁的衰减宽度。所得结果与现有的实验数据进行了比较。

英文摘要:

There are different assumptions on the substructure of the pentaquarks $P_c(4380)$ and $P_c(4450)$, newly founded in $J/ψN $ invariant mass by the LHCb collaboration, giving consistent mass results with the experimental observations. The experimental data and recent theoretical studies on their mass suggest interpretation of these states as spin-3/2 negative-parity and spin-5/2 positive-parity pentaquarks, respectively. There may exist opposite-parity states corresponding to these particles, as well. Despite a lot of studies, however, the nature and internal organization of these pentaquarks in terms of quarks and gluons are not clear. To this end we need more theoretical investigations on other physical properties of these states. In this accordance, we study a strong and dominant decay of the $P_c(4380)$ to $J/ψ$ and $N$ in the framework of three point QCD sum rule method. An interpolating current in a molecular form is applied to calculate six strong coupling form factors defining the transitions of the positive and negative parity spin-3/2 pentaquark states. The values of the coupling constants are used in the calculation of the decay widths of these transitions. The obtained results are compared with the existing experimental data.

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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