Production of singlino dominated neutralinos in extended supersymmetric models

Neutralinos with a large singlino component may appear in extended supersymmetric models with additional singlet Higgs fields. Since singlinos do not couple to (s)fermions and gauge bosons, the cross sections for the production of singlino dominated neutralinos are generally small. Within the framework of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) and an E6 inspired model we study neutralino production e+e−→χ̃01χ̃02 (χ̃01,2χ̃03) with a singlino dominated χ̃02 (χ̃03). It is shown that neutralinos with a singlino contribution up to 99% can be produced with a cross section larger than 1 fb and may therefore be detected at a high luminosity e+e− linear collider even if they are not the LSP.