Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle, Belle II Collaborations, :, I. Adachi, L. Aggarwal
| Summary:
We report the result of a search for the rare decay $B^{0} to gamma gamma$
using a combined dataset of $753times10^{6}$ $Bbar{B}$ pairs collected by the
Belle experiment and $387times10^{6}$ $Bbar{B}$ pairs collected by the Belle
II experiment from decays of the $rm Upsilon(4S)$ resonance produced in
$e^{+}e^{-}$ collisions. A simultaneous fit to the Belle and Belle II data sets
yields $11.0^{+6.5}_{-5.5}$ signal events, corresponding to a 2.5$sigma$
significance. We determine the branching fraction $mathcal{B}(B^{0} to
gammagamma) = (3.7^{+2.2}_{-1.8}(rm stat)pm0.5(rm syst))times10^{-8}$ and
set a 90% credibility level upper limit of $mathcal{B}(B^{0} to gammagamma)
< 6.4times10^{-8}$.
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