| Experiment | Measurement [10-6] | $\Delta\chi^2$ | Reference | Comments |
|---|---|---|---|---|
| Average | $2.36 \pm0.21$ | 3.00 | $p=0.22$ (ndf=2) | The PDG uncertainty includes a scale factor. |
| PDG | $2.36\,^{+0.38}_{-0.37}$ | pdgLive | ||
| Belle | $2.12 \pm0.23 \pm0.11$ | 0.86 | Phys.Rev.Lett. 108,031801 (2012) | |
| BaBar | $2.94\,^{+0.39}_{-0.34} \pm0.21$ | 2.14 | Phys.Rev.D 80,112002 (2009) | |
| CLEO | $2.2\,^{+2.8}_{-2.2}$ | 0.00 | Phys.Rev.Lett. 85,520 (2000) |