Measurement of the Radiative Decay WidthΓ(K¯*0(890)→K¯0γ)

Abstract

The differential cross sections for coherent production of ${\overline{K}}^{*0\mathrm{}}\mathrm{}\left(890\right)\mathrm{}$ were measured with nuclear targets. These measurements are interpreted using a two-component model which accounts for Coulomb production and $\omega$ exchange. The radiative decay width is determined to be $\Gamma \left({\overline{K}}^{*0\mathrm{}}\mathrm{}\right(890)\mathrm{}\to {\overline{K}}^0\gamma )=75\mathrm{}\pm 35$ keV, which is 3 times lower than expected from a simple quark model.