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Search for the rare decay $D^0\to\gamma\gamma$ at Belle
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arxiv 1512.02992 v1 pith:K6RV47FO submitted 2015-12-09 hep-ex
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abstract
We search for the rare radiative decay $D^0\to\gamma\gamma$ using a data sample with an integrated luminosity of $832{\rm fb^{-1}}$ recorded by the Belle detector at the KEKB $e^+e^-$ asymmetric-energy collider. We find no statistically significant signal and set an upper limit on the branching fraction of ${\cal B}(D^0\to\gamma\gamma)<8.5\times10^{-7}$ at $90\%$ confidence level. This is the most restrictive limit on the decay channel to date.
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