| Experiment | Measurement [10-5] | $\Delta\chi^2$ | Reference | Comments |
|---|---|---|---|---|
| Average | $1.98 \pm0.45$ | |||
| PDG | $1.98 \pm0.45$ | pdgLive | ||
| BaBar | $1.98 \pm0.37 \pm0.25$ | 0.00 | Phys.Rev.D 85,112010 (2012) | The nonresonant amplitude is modelled using a polynomial function of order 2. |