Probing the electromagnetic structure of the $P_c(4337)^+$ pentaquark: Insights from a diquark-diquark-antiquark picture for $J^P = \frac{1}{2}^-$ and $\frac{3}{2}^-$ states

TL;DR

This study calculates the electromagnetic properties of the $P_c(4337)$ pentaquark using a diquark-diquark-antiquark model and QCD sum rules, providing theoretical benchmarks for future experiments to determine its quantum numbers and structure.

Contribution

It introduces a QCD light-cone sum rule approach to compute electromagnetic moments of the $P_c(4337)$ within a diquark model, offering new insights into its internal structure.

Findings

Magnetic moment for $J^P=1/2^-$: $1.76 1.44~\u03bc_N$

Magnetic moment for $J^P=3/2^-$: $-1.38 0.35~\u03bc_N$

Non-spherical charge distribution for the $3/2^-$ state

Abstract

In this work, the electromagnetic structure of the hidden-charm pentaquark $P_c(4337)$ is investigated within the diquark-diquark-antiquark model using the QCD light-cone sum rule approach. The magnetic moments of the $ P_c(4337) $ state are calculated for the spin-parity assignments $ J^P = \frac{1}{2}^- $ and $\frac{3}{2}^-$. The results are found to be $ \mu_{P_c} = 1.76 \pm 0.44~\mu_N $ for the $ \frac{1}{2}^- $ case and $ \mu_{P_c} = -1.38 \pm 0.35~\mu_N $ for the $ \frac{3}{2}^- $ scenario. These findings offer important insights into the internal quark-gluon structure and electromagnetic features of this multiquark system. Beyond their theoretical relevance, the results serve as essential benchmarks for future experimental studies aimed at determining the quantum numbers and underlying configuration of the $ P_c(4337) $. Additionally, the electric quadrupole and magnetic octupole moments of the spin-$\frac{3}{2}$ state are extracted, indicating a non-spherical charge distribution for this exotic pentaquark.