  Within the framework of chiral effective field theory, we study various
electromagnetic processes with light vector resonances: $K^{\ast}(892)\to
K\gamma$, $e^{+}e^{-}\to K^{\ast}(892)K $ and the $\omega\pi\gamma^\ast$ form
factors. With two multiplets of vector resonances being introduced, we fit the
decay widths of $K^{\ast0}\to K^{0}\gamma$, $K^{\ast+}\to K^{+}\gamma$, and the
pertinent measurements from the $e^{+}e^{-}\to K^{\ast \pm}(892)K^{\mp} $ cross
sections, such as moduli and relative phases between the isoscalar and
isovector components from BABAR collaboration, together with the $\omega\pi$
form factors from NA60, SND and CLEO collaborations. The values of resonance
couplings, masses and widths of the excited vector states $\rho'$ and $\phi'$
are then determined. The $\omega'$-$\phi'$ mixing angle is discussed and turns
out to be quite different from the ideal mixing case. Three sources of $SU(3)$
symmetry breaking effects in the $\Gamma(K^{\ast}\to K\gamma)$ decays are
identified and analyzed in detail.
