Charting doubly strange hidden-charm pentaquarks: An electromagnetic mapping of spin-12 and 32 states
2026/07/01 by Ulaş Özdem, U. Özdem
Physics and Astronomy · #Atomic and Subatomic Physics Research #Electromagnetic field #Electromagnetic radiation #Field (mathematics) #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #hep-ex #hep-lat #hep-ph #hep-th
paper · pdf · doi:10.1016/j.cjph.2026.07.002
22 pages, 2 figures, 4 tables. Version accepted for publication in Chinese Journal of Physics
openalex publication_date 2026/07/01 · arxiv created 2026/07/05 · openalex created_date 2026/07/10 · openalex updated_date 2026/07/11 · arxiv updated 2026/08/06
Abstract
We calculate the magnetic dipole moments of doubly strange hidden-charm pentaquark states with spin-parity JP = 1/2- and 3/2- using QCD light-cone sum rules (LCSR), presenting the first systematic LCSR investigation of the electromagnetic multipole structure in the S = -2 sector. To assess the model dependence, we employ independent interpolating currents in diquark-diquark-antiquark form, which probe different assumptions about the internal color-spin correlations. For the spin-3/2 states, we also compute the electric quadrupole and magnetic octupole moments. The magnetic dipole moments exhibit a considerable spread across currents, ranging from -2.15 μN to 5.74 μN for spin-1/2 pentaquarks and from -4.25 μN to -0.43 μN for spin-3/2 states, reflecting the sensitivity of magnetic moments to the internal wave function. A quark-level decomposition reveals that the charm quark dominates in most configurations, while strange quarks play a decisive role only in currents favoring axial-vector diquark structures. The electric quadrupole moments lie between -2.01×10-2 fm2 and 5.55×10-2 fm2, and the magnetic octupole moments are typically an order of magnitude smaller. The current dependence of the magnetic dipole moments provides a quantitative measure of the theoretical uncertainty arising from the choice of interpolating operator. The pronounced isospin sensitivity of J3μ(x) across all three multipole moments arises from its axial-vector diquark structure, which isolates the light quark from spin averaging and allows the charge asymmetry eu/ed = -2 to propagate directly into the electromagnetic moments; the ratio μu/μd = -2.00 confirms this mechanism exactly. Our predictions offer benchmarks for future experiments and lattice QCD calculations, and may help discriminate among competing structural models.
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