期刊
PHYSICAL REVIEW D
卷 99, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.014035
关键词
-
资金
- National Natural Science Foundation of China [11535005, 11775118]
- European Union [665919]
- Spanish MINECO's Juan de la Cierva-Incorporacion programme [IJCI-2016-30028]
- Spanish Ministerio de Economia, Industria y Competitividad [FPA2014-55613-P, FPA2017-86989-P, SEV-2016-0588]
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) = 1/2 +/-, 3/2 +/- and 5/2 +/- and in the 1/2 and 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 Sigma(b)(*)(B) over bar(*) Their inner structures have been also analyzed with the computation of the distance among any pair of quarks within the hound-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-hound 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据