Distinguishing between MSSM and NMSSM with eγ scattering

We study the associated production of selectrons and neutralinos with subsequent leptonic decay of the selectron in eγ scattering within the framework of Minimal Supersymmetric Standard Model and Next-to-Minimal Supersymmetric Standard Model. Due to the weak couplings of singlino dominated neutralinos, associated neutralino production e+e−→χ̃10χ̃20 at a linear collider can be strongly suppressed in some regions of the parameter space. Then the process eγ→ẽL/Rχ̃1/20→eχ̃1/20χ̃10 can give additional information on the underlying theory and the character of χ̃10 and χ̃20.