${\cal B}(B^0 \to \gamma \gamma)$
Experiment
Measurement [10
-7
]
$\Delta\chi^2$
Reference
Comments
Average
$< 3.3$
PDG
$< 3.2$
pdgLive
BaBar
$< 3.3$
Phys.Rev.D
83
,032006 (2011)
Belle
$< 6.2$
Phys.Rev.D
73
,051107 (2006)
Quoted upper limits are at 90% confidence level (CL), unless mentioned otherwise.
