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We point out that if the Peccei-Quinn symmetry breaking scale $F_a$ is in arange of the hadronic axion window ($F_a\sim 10^6$GeV), theee$\gamma\gamma+/\!\!\!\! E_T$ event in the CDF experiment can be naturallyexplained by a no-scale supergravity model with a light axino. We also stressthat the hadronic axion window still survives the intergalactic photon search,since a large entropy production due to the decay of Polonyi field yields asubstantial dilution of the cosmic axion density.Comment: 7 pages. We added the constraint on the hadronic axion window from  the life cycle of red-giant and horizontal-branch star

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Is the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ee</mml:mi><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi><mml:mo>+</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>event observed by the Collider Detector at Fermilab evidence for a light axino?

Is theeeγγ+ETevent observed by the Collider Detector at Fermilab evidence for a light axino?