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The mono-photon signature emerging in an E6 Supersymmetric Standard Model(E6SSM) from inert higgsino Dark Matter (DM) is analyzed at future $e^+e^-$colliders. As the inert neutral and charged higgsinos are nearly degenerate,the inert chargino is a rather long lived particle and the charged particleassociated with its decay to the inert higgsino is quite soft. We show that thepair production of inert charginos at a 500 GeV electron-positron collider withan initial or final state photon is the most promising channel for probing theinert higgsino as one DM candidate within the E6SSM. We also emphasize thatthis signal has no chance of being observed at the Large Hadron Collider withhigher energy and/or luminosity. Finally, we remark that, combined with a DMsignal produced in Direct Detection experiments involving an active higgsinostate as the second DM candidate, this dual evidence could point to atwo-component DM version of the E6SSM.

Monophoton signals in electron-positron colliders in a simplified E6SSM