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In a supersymmetry model with an axino as the lightest supersymmetricparticle (LSP) and a Bino as the next LSP (NLSP), supersymmetry particlesproduced in pair at a high energy collider end up with including two Binos,followed by each Bino's decay into a photon and an axino. Final states arediphoton with large missing energy. We have comprehensively studied theimplication of $\gamma\gamma+$MET data from the ALEPH, CDF II, and recent ATLASand CMS experiments. No excess over the standard model backgrounds can beexplained in this model if the NLSP Bino decays outside the detector, whichhappens when the axino decay constant $f_a$ is large enough. The ALEPH and CDFII data put a very strong bound on $f_a$ for light Bino case with$m_{\tilde{B}} < 150$ GeV: the narrow hadronic axion window around $f_a \sim10^6$ GeV is completely closed. In the case where the gluino mass is smallerthan about 776 GeV, the recent ATLAS data limit $f_a > 10^5$ GeV for the Binomass below 700 GeV. This is already stronger than the previous laboratorybounds.

Probing axino LSP from diphotons events with large missing transverse energy