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We study the neutralino radiative decay into the lightest supersymmetricparticle (LSP) in the framework of a minimal anomalous U(1)' extension of theMSSM. It turns out that in a suitable decoupling limit the axino, which ispresent in the St\"uckelberg multiplet, is the LSP. We compute the branchingratio (BR) for the decay of a neutralino into an axino and a photon. We findthat in a wide region of the parameter space, the BR is higher than 93% incontrast with the typical value (<=1%) in the CMSSM.

Gaugino radiative decay in an anomalous U(1)' model