Electromagnetic structure of charged and neutral strange vector mesons

2026/07/27 by Parada T. P. Hutauruk
#hep-ph #nucl-th

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Abstract

We investigate the electromagnetic form factors (EMFFs) of the charged K^*+(892) (us) and neutral K⁰(896) (ds) strange vector mesons within the covariant Nambu--Jona-Lasinio (NJL) model, employing the Schwinger proper-time regularization scheme to regularize ultraviolet divergences while incorporating the QCD aspect of quark confinement. To this end, we evaluate the charge (electric) G_C(Q²), magnetic G_M(Q²), and quadrupole G_Q(Q²) form factors, as well as the charge radii, of the charged K⁺(892) and neutral K⁰(896) strange vector mesons. We find the charge radii to be ⟨ r² ⟩_K⁺ = 0.45~fm² and ⟨ r² ⟩_K⁰ = -0.04~fm², respectively, while the corresponding magnetic moments are μ_K⁺ = 2.67,μ_N and μ_K^*0 = 0.032,μ_N. These results are consistent with other theoretical calculations and lattice QCD simulations.

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