Is the ee gamma gamma+ Missing E(T) Event an Evidence of the Light Axino?

Abstract

We point out that if the Peccei-Quinn symmetry breaking scale $F_a$ is in a range of the hadronic axion window ($F_a\sim 10^6$GeV), the ee$\gamma \gamma +/E_T$ event in the CDF experiment can be naturally explained by a no-scale supergravity model with a light axino. We also stress that the hadronic axion window still survives the intergalactic photon search, since a large entropy production due to the decay of Polonyi field yields a substantial dilution of the cosmic axion density.

arXiv comment7 pages. We added the constraint on the hadronic axion window from the life cycle of red-giant and horizontal-branch stars

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Cited by in corpus (14)

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• Supersymmetric Scenarios with Dominant Radiative Neutralino Decay
• Single-photon signals at LEP in supersymmetric models with a light gravitino
• Collider signals from slow decays in supersymmetric models with an intermediate-scale solution to the mu problem
• Phenomenological Aspects of a Direct-transmission Model of Dynamical Supersymmetry Breaking with the Gravitino Mass $m_{3/2} < 1~\KEV$
• Experimental consequences of no-scale supergravity in light of the CDF $ee\gamma \gamma$ event
• Analysis of LEP Constraints on Supersymmetric Models with a Light Gravitino
• Hadron colliders as the ``neutralino factory'': Search for a slow decay of the lightest neutralino at the CERN LHC
• Proposal to search for a monochromatic component of solar axions using ${}^{57}$Fe
• An E${}_6$ interpretation of an $e^{+}{e}^{-}\gamma \gamma E{/}_T$ event
• Perspectives for Detection of a Higgsino-like Relic Neutralino
• Probing axino LSP from diphotons events with large missing transverse energy