Evidence for a spin-1 resonance in the reaction γγ*→${\mathit{K}}^0$${\mathit{K}}^{\pm }$${\mathrm{\pi }}^{\pm }$

We confirm the observation of a spin-1 resonance at 1423 MeV in the $K_S^0$ $K^{\pm }$ ${\pi }^{\mp }$ system produced in single-tagged two-photon interactions. The Dalitz plot indicates that this resonance decays primarily via a $K^{\mathrm{*}}$K intermediate state. We measure a radiative width times branching ratio ${\mathit{B}}_{\mathit{KK}\mathrm{¯}\mathrm{\pi }}$(${\mathit{M}}^2$/${\mathit{Q}}^2$)${\mathrm{\Gamma }}_{\gamma \gamma \mathrm{*}}$=3.2±1.4±0.6 keV on the assumption of a ρ-pole form factor.