
| Experiment | Measurement [10-4] | $\Delta\chi^2$ | Reference | Comments |
|---|---|---|---|---|
| Average | $< 6.2$ | |||
| PDG | $< 6.2$ | pdgLive | ||
| CLEO | $< 6.200$ | Phys.Rev.Lett. 62,2436 (1989) | CLEO assumes ${\cal{B}} (\Upsilon(4S) \to B^0 \overline{B}^0) = 0.43$. The result has been modified to account for a branching fraction of 0.50. |