Search for the decay B0 to gamma gamma
Abstract
The rare decay B0 -> gamma gamma is searched for in 104 fb-1 of data, corresponding to 111 x 106 BBar pairs, collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. No evidence for the signal is found, and an upper limit of 6.2 x 10-7 at 90% confidence level is set for the corresponding branching fraction.
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