On the form factors of $d^{\ast }(2380)$

Abstract

In order to explore the possible physical quantities for judging different structures of the newly observed resonance $d^{\ast }(2380)$, we study its electromagnetic form factors. In addition to the electric charge monopole $C0$, we calculate its electric quadrupole $E2$, magnetic dipole $M1$, and six-pole $M3$ form factors on the base of the realistic coupled $\Delta \Delta +CC$ channel $d^{\ast }$ wave function with both the $S$- and $D$-partial waves. The results show that the magnetic dipole moment and electric quadrupole deformation of $d^{\ast }$ are 7.602 and $2.53\times 10^{-2}{\mathrm{fm}}^2$, respectively. The calculated magnetic dipole moment in the naive constituent quark model is also compared with the result of $D_{12}\pi$ picture. By comparing with partial results where the $d^{\ast }$ state is considered with a single $\Delta \Delta$ and with a $D_{12}\pi$ structures, we find that in addition to the charge distribution of $d^{\ast }(2380)$, the magnetic dipole moment and magnetic radius can be used to discriminate different structures of $d^{\ast }$. Moreover, a quite small electric quadrupole deformation indicates that $d^{\ast }$ is more inclined to an slightly oblate shape due to our compact hexaquark dominated structure of $d^{\ast }(2380)$.

14 pages, 4 figures

References in corpus (14)

• Hadronic molecules
• ABC Effect in Basic Double-Pionic Fusion --- Observation of a new resonance?
• Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements
• Three-body model calculations of Nucleon-Delta and Delta-Delta dibaryon resonances
• A pure S-wave covariant model for the nucleon
• Role of diquark correlations and the pion cloud in nucleon elastic form factors
• Time- and Spacelike Nucleon Electromagnetic Form Factors beyond Relativistic Constituent Quark Models
• A study of $d^{\ast }(2380)\to d\pi \pi$ decay width
• ABC effect as a signal of chiral symmetry restoration in hadronic collisions
• Phenomenological Lagrangian approach to the electromagnetic deuteron form factors
• $\rho$ meson unpolarized generalized parton distributions with a light-front constituent quark model
• Magnetic moment of the rho meson in instant-form relativistic quantum mechanics
• On the charge distribution of $d^{\ast }(2380)$
• Study of the in-medium nucleon electromagnetic form factors using a light-front nucleon wave function combined with the quark-meson coupling model

Cited by in corpus (8)

• The $d^{\ast }(2380)$ in neutron stars - a new degree of freedom?
• Selected strong decays of pentaquark State $P_c(4312)$ in a chiral constituent quark model
• Deuteron photodisintegration by polarized photons in the region of the $d^{\ast }(2380)$
• Hidden-charm Hexaquarks from Lattice QCD
• Photo-absorption on deuteron contributed by d^*(2380) resonance
• Electromagnetic properties of the $d^{\ast }(2380)$ hexaquark
• The opportunity to find ${\bar{d}}^{\ast }(2380)$ in the ${\rm Y}(nS)$ decay
• Is $d^{\ast }(2380)$ a compact hexaquark state?