| Experiment | Measurement [10-6] | $\Delta\chi^2$ | Reference | Comments |
|---|---|---|---|---|
| Average | $2.68 \pm0.46$ | 3.68 | $p=0.16$ (ndf=2) | The PDG uncertainty includes a scale factor. |
| PDG | $2.70\,^{+0.87}_{-0.84}$ | pdgLive | ||
| BaBar | $3.5 \pm0.6 \pm0.2$ | 1.67 | Phys.Rev.D 80,112002 (2009) | |
| Belle | $1.76\,^{+0.67}_{-0.62}\,^{+0.15}_{-0.14}$ | 1.81 | Phys.Rev.Lett. 97,061802 (2006) | |
| CLEO | $1.0\,^{+5.8}_{-1.0}$ | 0.20 | Phys.Rev.Lett. 85,520 (2000) |