Doubly Charged Higgsino Pair Production and Decays in e+e- Collisions

In supersymmetric grand unified theories, light higgsino multiplets generally exist in addition to the familiar chargino/neutralino multiplets of the minimal supersymmetric extension of the Standard Model. The new multiplets may include doubly charged states $\tildeΔ^{\pm\pm}$ and $\tildeδ^{\pm\pm}$. We study the properties and the production channels of these novel higgsinos in $e^+e^-$ and $γγ$ collisions, and investigate how their properties can be analyzed experimentally.

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