Researchers have utilized the covariant Nambu-Jona-Lasinio (NJL) model to investigate the electromagnetic structure of charged $K^{*+}(892)$ and neutral $K^{*0}(896)$ strange vector mesons. This model, which incorporates Schwinger proper-time regularization for ultraviolet divergences and QCD's quark confinement, enabled the calculation of the charge (electric) $G_C(Q^2)$, magnetic $G_M(Q^2)$, and quadrupole $G_Q(Q^2)$ form factors for these mesons.

The obtained results for the mean square charge radii are $\langle r^2 \rangle_{K^{*+}} = 0.45 \text{ fm}^2$ and $\langle r^2 \rangle_{K^{*0}} = -0.04 \text{ fm}^2$. For the magnetic moments, values of $μ_{K^{*+}} = 2.67 μ_N$ and $μ_{K^{*0}} = 0.032 μ_N$ were calculated, where $μ_N$ is the nuclear magneton. These values are crucial for understanding the internal distribution of charge and spin within these subatomic particles, which are composed of an up or down quark and a strange antiquark.

These findings are consistent with other theoretical predictions and lattice QCD simulations, reinforcing the validity of the NJL model in describing meson properties. The ability to accurately predict these electromagnetic properties is fundamental for advancing our understanding of strong interactions and hadronic structure, especially in the strange meson sector, which is key for testing extensions of the Standard Model of particle physics.