Search for the decay B0 to gamma gamma
The Belle Collaboration: S. Villa, et al
TL;DR
This paper reports a search for the rare decay B0 to gamma gamma using Belle detector data, setting an upper limit on its branching fraction due to no observed signal.
Contribution
The study provides the first upper limit on the B0 to gamma gamma decay branching fraction using 104 fb^-1 of data.
Findings
No evidence for B0 to gamma gamma decay was observed.
An upper limit of 6.2 x 10^-7 was set on the branching fraction.
The results constrain new physics models predicting this decay.
Abstract
The rare decay B0 -> gamma gamma is searched for in 104 fb^-1 of data, corresponding to 111 x 10^6 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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