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We have studied the sensitivity of the ATLAS detector for supersymmetricneutralino signals in the $Z\gamma +\notE_{T}$ final state in a GMSB model inwhich the Higgsino-like neutralino is NLSP. This study considers the reactionof $pp \ra \tilde{\chi}^{0}_{1} \tilde{\chi}^{0}_{1} \ra Z(\ra\ell^{+}\ell^{-})\gamma \tilde{G}\tilde{G}$, where $\ell = \mu/e$, at a centerof mass energy of $\sqrt{s}$=10 \TeV using fully simulated ATLAS Monte Carloevents both for the signal and background. Based on the GMSB Model Line Epredictions, we expect that, for an integrated luminosity of less then 3fb$^{-1}$, ATLAS could detect the GMSB signal from the Higgsino-like neutralinothat has a mass of 134.7 \GeV in the $Z\gamma +\notE_{T}$ final state with asignificance of 5$\sigma$, assuming 20% systematic uncertainty.

Discovery Potential for GMSB Supersymmetry in ATLAS using the $Z\gamma + \not E_T$ Final State at a center of mass energy of $\sqrt{s}$=10 \TeV