Hidden-bottom pentaquarks
Hidden-bottom pentaquarks
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隐底五夸克
DOI：
10.1103/physrevd.99.014035
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发表时间：
2018-09
影响因子：
5
通讯作者：
Segovia Jorge
中科院分区：
文献类型：
--
作者：
Yang Gang;Ping Jialun;Segovia Jorge
LHCb合作最近报道了在隐藏魅力重子区存在五夸克态的强有力证据，即所谓的${P}_{c}(4380{)}^{+}$和${P}_{c}(4450{)}^{+}$信号。对于夸克-夸克相互作用，我们使用了一个手征夸克模型，它成功地解释了从轻夸克到重夸克的介子和重子现象学，探索了隐藏魅力部分的五夸克束缚态。在这里，我们将这种研究扩展到隐底五夸克区，分析了具有自旋宇称量子数${J}^{P}={\frac{1}{2}}^{\ifmmode\pm\else\textpm\fi{}}$，${\frac{3}{2}}^{\ifmmode\pm\else\textpm\fi{}}$和${\frac{5}{2}}^{\ifmmode\pm\else\textpm\fi{}}$，的可能的束缚态以及$\FRAC{1}{2}$和$\FRAC{3}{2}$同位旋区。我们没有发现隐藏在底部的正宇称五夸克态；然而，我们发现了几个具有主要重子-介子结构的负宇称候选态${\mathrm{\ensuremath{\Sigma}}}_{b}^{(*)}{\overline{B}}^{(*)}$.通过计算束缚态内任意一对夸克之间的距离，分析了它们的内部结构。这个实验反映了在耦合通道计算中只考虑单色组态时，分子类型的束缚态是有利的，而当加入隐色组态时，可以发现一些深束缚的致密五夸克。最后，我们的发现类似于在隐藏魅力区域中发现的，但正如预期的那样，我们在隐藏底部区域中发现了更大的结合能和隐藏颜色构型的更大贡献。
The LHCb Collaboration has recently reported strong evidences of the existence of pentaquark states in the hidden-charm baryon sector, the so-called ${P}_{c}(4380{)}^{+}$ and ${P}_{c}(4450{)}^{+}$ signals. Five-quark bound states in the hidden-charm sector were explored by us using, for the quark-quark interaction, a chiral quark model which successfully explains meson and baryon phenomenology, from the light to the heavy quark sector. We extend herein such study into the hidden-bottom pentaquark sector, analyzing possible bound-states with spin-parity quantum numbers ${J}^{P}={\frac{1}{2}}^{\ifmmode\pm\else\textpm\fi{}}$, ${\frac{3}{2}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${\frac{5}{2}}^{\ifmmode\pm\else\textpm\fi{}}$, and in the $\frac{1}{2}$ and $\frac{3}{2}$ isospin sectors. We do not find positive parity hidden-bottom pentaquark states; however, several candidates with negative parity are found with dominant baryon-meson structures ${\mathrm{\ensuremath{\Sigma}}}_{b}^{(*)}{\overline{B}}^{(*)}$. Their inner structures have been also analyzed with the computation of the distance among any pair of quarks within the bound-state. This exercise reflects that molecular-type bound-states are favored when only color-singlet configurations are considered in the coupled-channels calculation whereas some deeply-bound compact pentaquarks can be found when hidden-color configurations are added. Finally, our findings resemble the ones found in the hidden-charm sector but, as expected, we find in the hidden-bottom sector larger binding energies and bigger contributions of the hidden-color configurations.
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