| Experiment | Measurement [10-5] | $\Delta\chi^2$ | Reference | Comments |
|---|---|---|---|---|
| Average | $2.392 \pm0.062$ | 3.03 | $p=0.70$ (ndf=5) | The PDG average is a result of a fit including input from other measurements. |
| PDG | $2.389 \pm0.063$ | pdgLive | ||
| Belle | $2.397 \pm0.053 \pm0.071$ | 0.00 | Phys.Rev.D 87,031103 (2013) | |
| Belle II | $2.44 \pm0.07 \pm0.09$ | 0.18 | Phys.Rev.D 109,012001 (2024) | |
| BaBar | $2.39 \pm0.11 \pm0.10$ | 0.00 | Phys.Rev.Lett. 97,171805 (2006) | |
| CLEO | $1.88\,^{+0.37}_{-0.33}\,^{+0.21}_{-0.18}$ | 1.45 | Phys.Rev.D 68,052002 (2003) | |
| LHCb | ${\cal B}(B^+ \to K^+ \bar{K}^0) / {\cal B}(B^+ \to K^0 \pi^+)$ | 0.10 | arXiv:2512.09288 |
| Source | Parameter | Correlation [%] | Value | $\Delta\chi^2$ |
|---|---|---|---|---|
| fit | ${\cal B}(B^+ \to K^+ \bar{K}^0)$ | 25.1 | $1.282 \pm0.095 \times 10^{-6}$ |