Hidden charm pentaquarks and the nature of Pc states observed at LHCb
Abstract
We carry out a unified study of the low-lying 1S-wave compact states and hadronic molecules composed of hidden charm pentaquarks qqqcc̅ (q=u,d) within a semirelativistic potential quark model. Apart from the linear confinement and one-gluon exchange potential between quarks and/or antiquarks, one-boson exchange potential is also included for baryon and meson clusters within the pentaquark system. We also evaluate the fall-apart decays by combining the obtained spectra within the quark exchange model. It is found that the Pc (4312)+, Pc (4440)+, and Pc (4457)+ observed by the LHCb Collaboration in 2019 can be well explained by the hadronic molecules of [ΣcD̅]1/2-1/2(4318), [ΣcD̅*]1/2-1/2(4437), and [ΣcD̅*]3/2-1/2(4458), respectively. Meanwhile, Pc(4380)+ reported by LHCb in 2015 may be assigned as the molecule [Σc*D̅]3/2-1/2(4382), except that it turns to be a narrow state other than a broad one shown by the experimental data. Our study shows that the σ- and ρ-meson exchanges are crucial for the formation of Σc(*)D̅(*) bound states with isospin I=1/2. Depending on the potential strength of the σ exchange, there may exist very shallow bound states of ΛcD̅(*) with isospin I=1/2 and Σc(*)D̅(*) with isospin I=3/2. Our study may provide useful information for further exploring the hidden-charm pentaquarks in future experiments.
Related
- Chiral mass corrections to decuplet hidden-charm pentaquark states
- Pion radiative decays of excited hidden-charm pentaquark molecules: from Σc(*)D̅(*)(2S) molecules to the reported Pc states
- Analysis of the two-body strong decays of the hidden-charm pentaquark states in QCD sum rules
- Hidden-heavy Pentaquarks in the Born-Oppenheimer Approximation for QCD
- Five-flavor udscb¯ molecular pentaquarks from heavy-quark and local hidden gauge symmetries
BibTeX
@misc{liang2026hidden,
title = {{Hidden charm pentaquarks and the nature of $P_c$ states observed at LHCb}},
author = {Zhi-Biao Liang and Jun-Jie Liu and Mu-Yang Chen and Xian-Hui Zhong and Qiang Zhao},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.19749},
eprint = {2609.19749},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.19749},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Hidden charm pentaquarks and the nature of P_c states observed at LHCb
AU - Zhi-Biao Liang
AU - Jun-Jie Liu
AU - Mu-Yang Chen
AU - Xian-Hui Zhong
AU - Qiang Zhao
PY - 2026
DA - 2026/09/28
PB - arXiv
DO - 10.48550/arxiv.2609.19749
UR - https://arxiv.org/abs/2609.19749
AB - We carry out a unified study of the low-lying 1S-wave compact states and hadronic molecules composed of hidden charm pentaquarks qqqcc̅ (q=u,d) within a semirelativistic potential quark model. Apart from the linear confinement and one-gluon exchange potential between quarks and/or antiquarks, one-boson exchange potential is also included for baryon and meson clusters within the pentaquark system. We also evaluate the fall-apart decays by combining the obtained spectra within the quark exchange model. It is found that the P_c (4312)^+, P_c (4440)^+, and P_c (4457)^+ observed by the LHCb Collaboration in 2019 can be well explained by the hadronic molecules of [Σ_cD̅]_1/2^-^1/2(4318), [Σ_cD̅^*]_1/2^-^1/2(4437), and [Σ_cD̅^*]_3/2^-^1/2(4458), respectively. Meanwhile, P_c(4380)^+ reported by LHCb in 2015 may be assigned as the molecule [Σ_c^*D̅]_3/2^-^1/2(4382), except that it turns to be a narrow state other than a broad one shown by the experimental data. Our study shows that the σ- and ρ-meson exchanges are crucial for the formation of Σ_c^(*)D̅^(*) bound states with isospin I=1/2. Depending on the potential strength of the σ exchange, there may exist very shallow bound states of Λ_cD̅^(*) with isospin I=1/2 and Σ_c^(*)D̅^(*) with isospin I=3/2. Our study may provide useful information for further exploring the hidden-charm pentaquarks in future experiments.
ER -