Hidden Charm Pentaquark $P_c(4380)$ and Doubly Charmed Baryon $\Xi_{cc}^*(4380)$ as Hadronic Molecule States

TL;DR

This paper models the $P_c(4380)$ pentaquark and a related doubly charmed baryon as hadronic molecules using coupled-channel calculations, successfully reproducing observed properties and predicting a new doubly charmed baryon state.

Contribution

It introduces a coupled-channel hadronic molecule model with complex scaling and Gaussian expansion methods to explain $P_c(4380)$ and predict a new doubly charmed baryon.

Findings

Reproduces mass and width of $P_c(4380)$ within a reasonable parameter range.

Identifies $ ext{Lambda}_c ar{D}^*$ as the main decay mode.

Predicts a doubly charmed baryon close in mass and width to $P_c(4380)$.

Abstract

We study hadronic molecular states in a coupled system of $J/\psi N - \Lambda_c\bar{D}^{(*)} - \Sigma_c^{(*)}\bar{D}^{(*)}$ in $I(J^P) = \frac{1}{2}(\frac{3}{2}^-)$ channel, using the complex scaling method combined with the Gaussian expansion method. We construct the potential including one pion exchange and one $D^{(*)}$ meson exchange with $S$-wave orbital angular momentum. We find that the both mass and width of the pentaquark $P_c(4380)$ can be reproduced within a reasonable parameter region, and that its main decay mode is $\Lambda_c\bar{D}^*$. We extend our analysis to a coupled system of $\Lambda_c D^{(*)} - \Sigma_c^{(*)}D^{(*)}$ in $I(J^P) = \frac{1}{2}(\frac{3}{2}^-)$ channel. We find that there exists a doubly charmed baryon of $ccqq\bar{q}$ type as a hadronic molecule, the mass and width of which are quite close to those of $P_c(4380)$.