Eur. Phys. J. Plus (2025) 140: 783
https://doi.org/10.1140/epjp/s13360-025-06732-z

Regular Article

Doubly-charmed pentaquark states in a mass splitting model

School of Physics, Shandong University, 250100, Jinan, Shandong, China

^a This email address is being protected from spambots. You need JavaScript enabled to view it.

Received: 27 April 2025
Accepted: 5 August 2025
Published online: 22 August 2025

Abstract

Concentrating on the mass differences relative to $P_{\psi }^N{(4312)}^{+}$, we systematically investigate the spectra of doubly-charmed pentaquark states in the compact $ccqq\overline{q}$ ($q=u,d,s$) configuration. The assumption that the observed $P_{\psi }^N{(4312)}^{+}$ is a compact hidden-charm pentaquark with $I(J^P)=\frac{1}{2}({\frac{3}{2}}^{-})$ is adopted. We also study the properties of strong decays within a simple rearrangement scheme. The results indicate that the $I(J^P)=\frac{1}{2}({\frac{1}{2}}^{-})$$ccnn\overline{n}$ with $I_{\mathit{nn}}=0$ where n denotes u or d quark, $I(J^P)=0({\frac{1}{2}}^{-})$$ccnn\overline{s}$, and $I(J^P)=0({\frac{1}{2}}^{-})$$ccns\overline{n}$ ground states should be stable.