Investigation on the electromagnetic properties of the $ D^{(*)} \Sigma_c^{(*)}$ molecules

TL;DR

This paper calculates the electromagnetic properties of certain doubly-charmed pentaquark molecules using QCD sum rules, providing predictions for their magnetic dipole, electric quadrupole, and magnetic octupole moments to aid future experimental searches.

Contribution

It offers the first systematic evaluation of electromagnetic moments of $ D^{(*)} \, \Sigma_c^{(*)}$ pentaquarks using light-cone sum rules, revealing their non-spherical charge distributions.

Findings

Predicted magnetic dipole moments for three pentaquark states.

Extracted electric quadrupole and magnetic octupole moments.

Results suggest non-spherical charge distributions.

Abstract

We systematically explore their electromagnetic characteristics to improve our understanding of the quark-gluon dynamics underlying the complex and controversial nature of multiquark systems. In this study, the magnetic dipole moments of $ D \Sigma_c$, $ D \Sigma_c^{*}$ and $ D^{*} \Sigma_c$ doubly-charmed pentaquarks are extracted, which are directly related to the inner organization of the relevant states. The magnetic dipole moments of these states have been evaluated employing the QCD light-cone sum rules technique with isospin spin-parity $\rm{I(J^P)} = \frac{1}{2}(\frac{1}{2}^-)$, $\rm{I(J^P)} = \frac{1}{2}(\frac{3}{2}^-)$ and $\rm{I(J^P)} = \frac{1}{2}(\frac{3}{2}^-)$, for $ D \Sigma_c$, $ D \Sigma_c^{*}$ and $ D^{*} \Sigma_c$ doubly-charmed pentaquarks respectively. Our predictions for the magnetic dipole moment $\mu_{D\Sigma_c} = 2.98^{+0.76}_{-0.54}~\mu_N$ for the $ D \Sigma_c$ pentaquark, $\mu_{D\Sigma_c^*} = 1.65^{+0.45}_{-0.34}~\mu_N$ for the $D\Sigma_c^*$ pentaquark, and $\mu_{D^*\Sigma_c} = -3.63^{+0.79}_{-0.60}~\mu_N$ for the $D^*\Sigma_c$ pentaquark. Furthermore, we have also extracted the electric quadrupole and the magnetic octupole moments of the $ D \Sigma_c^{*}$ and $ D^{*} \Sigma_c$ doubly-charmed pentaquarks. These values show a non-spherical charge distribution. We hope that our predictions of the magnetic dipole moments of the doubly-charmed pentaquarks, in conjunction with the results of other theoretical investigations of the spectroscopic parameters and decay widths of these intriguing pentaquarks, will prove valuable in the search for these states in future experiments and in elucidating the internal structure of these pentaquarks.