| Experiment | Measurement [10-6] | $\Delta\chi^2$ | Reference | Comments |
|---|---|---|---|---|
| Average | $4.02 \pm0.27$ | 1.04 | $p=0.59$ (ndf=2) | |
| PDG | $4.02\,^{+0.27}_{-0.26}$ | pdgLive | ||
| Belle | $4.07 \pm0.26 \pm0.21$ | 0.02 | Phys.Rev.Lett. 108,031801 (2012) | |
| BaBar | $4.00 \pm0.40 \pm0.24$ | 0.00 | Phys.Rev.D 80,112002 (2009) | |
| CLEO | $1.2\,^{+2.8}_{-1.2}$ | 1.01 | Phys.Rev.Lett. 85,520 (2000) |